Merge pull request #2247 from kacpherek/fix/ambient-intervals

🤖 Agent: Read against the vanilla 26.3 sources (Use vanilla ambient sound intervals for guardians, hoglins, shulkers and allays) and proven in contrib-gate-21's union of 72 kacpherek PRs: 95 parity harnesses on playhorizon and the Mac mini, clippy, 1534 tests, lan_e2e 23 checks in-frame and with --server-thread. Thanks @kacpherek!

.github/workflows/ci.yml

@@ -72,6 +72,9 @@ jobs:
         if: steps.rust.outputs.required != 'false'
         run: |
           cargo +stable test --workspace --lib --bins --tests --features horizon-client/mods,horizon-mods/pack
+          # The full content-root tests (#[ignore]d: minutes each on a laptop). The same build as above; they need the
+          # prepared vanilla data, so without it they pass at once.
+          cargo +stable test --workspace --lib --features horizon-client/mods,horizon-mods/pack mod_content::tests:: -- --ignored
           cargo +stable test --workspace --doc --features horizon-client/mods,horizon-mods/pack
   # The launcher is its own workspace (launcher/Cargo.toml), so verify's cargo runs never build it. A pull request that
   # changes it or a crate it builds is checked here, and so is every push to main: two pull requests can each pass
@@ -144,6 +147,7 @@ jobs:
     with:
       base: ${{ github.event.pull_request.base.sha }}
       head: ${{ github.event.pull_request.head.sha }}
+      full: ${{ contains(github.event.pull_request.labels.*.name, 'full-parity') }}
   # Horizon never downloads the game. These jobs need a self-hosted Linux runner
   # (label horizon-game) holding the maintainer's own copy: the official launcher's
   # game directory in HORIZON_MINECRAFT_DIR and the pinned server jar in

.github/workflows/parity-main.yml

@@ -25,8 +25,8 @@ jobs:
   parity-main:
     # A Mac mini runner of its own (ludovics-mac-mini-2 holds only this label since 2026-10-26): behind PR parity jobs
     # this run waited 2 h while every merge replaced the pending one, and on the release runner a release then waited
-    # behind the next run. PR parity jobs have ludovics-mac-mini and the desktop. Not the desktop: a job slowed down
-    # because the maintainer came back could time out, and a failure here bisects and comments on merges.
+    # behind the next run. PR parity jobs have ludovics-mac-mini and playhorizon. Not playhorizon: its 4 CPUs
+    # make a core-crate run several times longer, and a failure here bisects and comments on merges.
     runs-on: [self-hosted, macOS, horizon-parity-main]
     timeout-minutes: 240  # a core-crate batch reruns ~300 harnesses (~60-90 min), a bisect a few rounds of the failures
     steps:

.github/workflows/parity.yml

@@ -1,6 +1,6 @@
 name: parity
-# The vanilla harnesses a pull request's changes can affect, on the Mac mini's runner, which holds the maintainer's
-# own Minecraft files (Horizon never downloads the game). Called by ci.yml for pull requests from this repository
+# The vanilla harnesses a pull request's changes can affect, on the Mac mini's runner or playhorizon's, which hold the
+# maintainer's own Minecraft files (Horizon never downloads the game). Called by ci.yml for pull requests from this repository
 # and by run-parity.yml when a maintainer labels a fork's pull request run-parity. See docs/release-flow.md.
 on:
   workflow_call:
@@ -13,6 +13,13 @@ on:
         description: The commit to check out and test
         type: string
         required: true
+      full:
+        description: >-
+          The pull request carries the full-parity label (a change every harness reaches, such as a crate split): it
+          runs on playhorizon's runner only, so the Mac mini's runners stay free for the others. While that runner is
+          busy the job waits for it.
+        type: boolean
+        default: false
 permissions:
   contents: read
 env:
@@ -21,40 +28,53 @@ env:
 
 jobs:
   parity:
-    runs-on: [self-hosted, horizon-game]
-    timeout-minutes: 120  # a change to core crates reruns ~300 harnesses: ~60-90 min on the Mac mini
+    runs-on: ${{ inputs.full && fromJSON('["self-hosted", "horizon-game", "playhorizon"]') || fromJSON('["self-hosted", "horizon-game"]') }}
+    # A change to core crates reruns ~350 harnesses: ~60-90 min on the Mac mini; on playhorizon (4 of its 8 vCPUs, 4
+    # harnesses at a time) up to a few hours, and any pull request's job may land there.
+    timeout-minutes: ${{ inputs.full && 360 || 180 }}
     steps:
       - uses: actions/checkout@v4
         with:
-          # The commit the event names: a fork's later pushes need another run-parity label.
+          # The commit the event names: a fork's later pushes need another run-parity label. The next step merges
+          # main into it.
           ref: ${{ inputs.head }}
           fetch-depth: 0
           persist-credentials: false
           # Keeps .local/ (parity state, probe builds, oracle results) and target/ between runs.
           clean: false
+      - name: The head merged into main (what merging it would land)
+        id: merge
+        env:
+          BASE_SHA: ${{ inputs.base }}
+          HEAD_SHA: ${{ inputs.head }}
+        run: |
+          # Harness fixes and game fixes that reached main since the branch was made then apply here too: a head
+          # tested alone failed harnesses already fixed on main (server_knockback before #2114, mob_ai's heap before
+          # #2270, save_roundtrip before #2212). Selection then compares with this main, so it sees only the pull
+          # request's own changes. A head that conflicts with main is tested alone.
+          set -euo pipefail
+          git merge --abort 2>/dev/null || true
+          git fetch -q --no-tags origin +refs/heads/main:refs/remotes/origin/main
+          main=$(git rev-parse origin/main)
+          if git -c user.name=parity -c user.email=parity@localhost merge -q --no-edit --no-ff "$main" >/dev/null 2>&1; then
+            echo "base=$main" >> "$GITHUB_OUTPUT"
+            echo "Tested: head ${HEAD_SHA:0:9} merged into main ${main:0:9}" | tee -a "$GITHUB_STEP_SUMMARY"
+          else
+            git merge --abort
+            echo "base=$BASE_SHA" >> "$GITHUB_OUTPUT"
+            echo "::warning::head ${HEAD_SHA:0:9} conflicts with main ${main:0:9}: tested alone, without main's fixes"
+            echo "Tested: head ${HEAD_SHA:0:9} alone (it conflicts with main ${main:0:9})" | tee -a "$GITHUB_STEP_SUMMARY"
+          fi
       - uses: dtolnay/rust-toolchain@stable
       - name: Tools from the runner
         run: bash tools/ci/runner-env.sh
       - name: Vanilla data, and resources prepared by this preparer
-        env:
-          BASE_SHA: ${{ inputs.base }}
-        run: |
-          # main's script: one written before a fix to it left a real .local/horizon-client without sounds.json on
-          # the runner, and every later job there failed `subtitle`. A branch that changes the script runs its own.
-          set -euo pipefail
-          if git rev-parse --verify -q origin/main >/dev/null \
-            && git diff --quiet "$(git merge-base "$BASE_SHA" HEAD)" HEAD -- tools/ci/vanilla-data.sh; then
-            git show origin/main:tools/ci/vanilla-data.sh > "$RUNNER_TEMP/vanilla-data.sh"
-            bash "$RUNNER_TEMP/vanilla-data.sh"
-          else
-            bash tools/ci/vanilla-data.sh
-          fi
+        run: bash tools/ci/vanilla-data.sh
       - name: The prepared output is the one the preparer's OUTPUT_VERSION says
         env:
-          BASE_SHA: ${{ inputs.base }}
+          BASE_SHA: ${{ steps.merge.outputs.base }}
         run: |
-          # The job runs main's workflow on the head's files: a head made before OUTPUT_VERSION (#1947) has neither
-          # the tool nor the number, so there is nothing to check.
+          # A head made before OUTPUT_VERSION (#1947) that conflicts with main has neither the tool nor the number.
           if [ ! -f tools/prepare_output.py ] || ! grep -q OUTPUT_VERSION crates/horizon-prepare/src/lib.rs; then
             echo "This head's preparer has no OUTPUT_VERSION: nothing to check"
             exit 0
@@ -65,47 +85,8 @@ jobs:
       - name: The harnesses this change can affect
         env:
           PARITY_HOSTS: ''
-          BASE_SHA: ${{ inputs.base }}
-        run: |
-          # main's selection (tools/parity.py --changed --list with main's parity.py and parity_reach.py), so a
-          # branch made before a better selection landed gets it too; the head's own runner then runs those
-          # harnesses. A branch that changes the selection itself selects with its own code.
-          set -euo pipefail
-          own() { python3 tools/parity.py --changed "$BASE_SHA" --timeout 2400; }  # world_spawn takes ~1480 s on a busy runner
-          fork_point=$(git merge-base "$BASE_SHA" HEAD)
-          if ! git rev-parse --verify -q origin/main >/dev/null || ! git diff --quiet "$fork_point" HEAD -- tools/parity.py tools/parity_reach.py; then
-            own
-            exit
-          fi
-          had_reach=$(git ls-files tools/parity_reach.py)
-          git show origin/main:tools/parity.py > tools/parity.py
-          git show origin/main:tools/parity_reach.py > tools/parity_reach.py
-          status=0
-          python3 tools/parity.py --changed "$BASE_SHA" --list > .local/parity-selection.txt || status=$?
-          git checkout -- tools/parity.py
-          if [ -n "$had_reach" ]; then git checkout -- tools/parity_reach.py; else rm -f tools/parity_reach.py; fi
-          cat .local/parity-selection.txt
-          if [ "$status" != 0 ]; then
-            echo "main's selection failed: the head's own selection runs"
-            own
-            exit
-          fi
-          names=$(sed '$d' .local/parity-selection.txt | grep -E '^[A-Za-z0-9_#]+$' || true)
-          # The summary line says how many would run: a count that doesn't match the names read (a format change)
-          # must not let the job pass untested.
-          expected=$(tail -1 .local/parity-selection.txt | sed -nE 's/^([0-9]+) of [0-9]+ harnesses would run$/\1/p')
-          count=$(printf '%s' "$names" | grep -c . || true)
-          if [ -z "$expected" ] || [ "$expected" != "$count" ]; then
-            echo "main's selection listed $count names, its summary says '${expected:-?}': the head's own selection runs"
-            own
-            exit
-          fi
-          if [ "$count" = 0 ]; then
-            echo "Nothing to run."
-            exit 0
-          fi
-          # shellcheck disable=SC2086
-          python3 tools/parity.py $names --timeout 2400
+          BASE_SHA: ${{ steps.merge.outputs.base }}
+        run: python3 tools/parity.py --changed "$BASE_SHA" --timeout 2400  # world_spawn takes ~1480 s on a busy runner
       - name: Logs of the failed harnesses
         if: failure()
         uses: actions/upload-artifact@v4

.github/workflows/run-parity.yml

@@ -22,3 +22,4 @@ jobs:
     with:
       base: ${{ github.event.pull_request.base.sha }}
       head: ${{ github.event.pull_request.head.sha }}
+      full: ${{ contains(github.event.pull_request.labels.*.name, 'full-parity') }}

AGENTS.md

@@ -10,7 +10,8 @@ Feature → files → harness for the most-changed areas: [docs/architecture.md]
   `tools/check_public_tree.py` rejects them; `git config core.hooksPath .githooks` runs it on commit.
 - **Keep your runs away from real player data.** Any game or launcher you start gets fresh `mktemp -d`
   folders in `HORIZON_HOME` (the game's data), `HORIZON_LAUNCHER_HOME`, `XDG_DATA_HOME` and
-  `XDG_CONFIG_HOME`, plus `HORIZON_LAUNCHER_NO_SELF_UPDATE=1` and `HORIZON_NO_AUDIO=1`. Never write to
+  `XDG_CONFIG_HOME`, plus `HORIZON_LAUNCHER_NO_SELF_UPDATE=1` and `HORIZON_NO_AUDIO=1`, and, for the
+  launcher, `HORIZON_LAUNCHER_TRASH`, `HORIZON_LAUNCHER_CLIPBOARD` and `HORIZON_LAUNCHER_DESKTOP` pointing into the scratch home. Never write to
   `~/.local/share/{applications,horizon,horizon-launcher}` or `~/.local/bin`.
 - **Mark what an agent posts.** A PR body starts with a line naming whose agent opened it and with what.
   Ludovic's agents write `> 🤖 Opened by Ludovic's AI agent (Claude), not by Ludovic himself.`, and a
@@ -34,7 +35,9 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se
 
 | Crate | Owns |
 |---|---|
-| `horizon-client` | The game: a lib (`src/lib.rs`, ~190 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
+| `horizon-client` | The game: a lib (`src/lib.rs`, ~180 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
+| `horizon-command` | Command parsing (Brigadier): the vanilla tree, argument types, selectors, suggestions, the tree's network form. Re-exported as `horizon_client::command` |
+| `horizon-client-core` | The client lib's bottom layer: `text.rs`, `lang.rs`, `snbt.rs`, `nbt_path.rs`, `component.rs`, `scoreboard.rs`, `bossbar.rs`, `gamerules.rs`, `block_entity_nbt.rs`, registry/particle/sound tables. Re-exported under the old paths (`horizon_client::text`...) |
 | `horizon-world` | Vanilla world data with no gameplay loop: NBT, regions, chunks, `datafix/`, `worldgen/`, `level/` (server-side block behaviour, ticks, redstone), entity physics, items, effects, food, damage |
 | `horizon-core` | Simulation primitives: Java `Random`s, `jmath` (HotSpot-exact `Math`), positions, noise, density, paletted storage, `version.rs` (the pinned version) |
 | `horizon-protocol` | Network protocol 777: codecs, framing, encryption, `packets/{handshake,status,login,configuration,play}.rs`, `entity_data.rs` |
@@ -63,6 +66,7 @@ reads `README.md`, `launcher/links.json`, `docs/api/`, `roadmap/roadmap.json` an
 python3 tools/pr_ready.py                  # the self-check: fmt, clippy -D warnings, touched crates' tests, harnesses; paste its block in the PR
 python3 tools/pr_ready.py --quick          # same without harnesses
 cargo test -p horizon-client --lib --bins --tests   # skips the 104 examples (pr_ready does this); `--doc` separately
+cargo test -p horizon-client --features horizon-client/mods --lib mod_content::tests:: -- --ignored   # the 5 slow content-root tests, #[ignore]d; pr_ready runs them when mod content, assets, blocks or items change
 cargo build --profile fast -p horizon-client        # optimized, quick to link: use it to play or run lan_e2e
 python3 tools/parity.py --changed origin/main       # the harnesses your branch can affect (CI's parity job)
 python3 tools/parity.py --changed-files paths.txt --list   # which harnesses cover these files, without running them
@@ -118,16 +122,16 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 | Other entities | L: `entities.rs`, `projectiles.rs`, `arrows.rs`; G: `boats.rs`, `minecarts.rs`, `mounts.rs`, `armor_stands.rs`, `paintings.rs`, `frames.rs`, `fireworks.rs`, `tnt.rs`, `explosion.rs` |
 | Player actions | game.rs (`fn use_hand`, `fn use_item`, `fn attack`, `fn tick_mining`, `fn break_block`); G: `hand.rs`, `combat.rs`, `consume.rs`, `potions.rs`, `shield.rs`, `crossbow.rs`, `trident.rs`, `fishing.rs`; L: `motion.rs` + `motion/` (movement), `collisions.rs`, `items.rs`, `item_data.rs` |
 | Inventory and containers | L: `menu.rs` (`AbstractContainerMenu.clicked`), `container_screen.rs`, `containers.rs`, `creative.rs`, `crafting.rs`, `recipe_book*.rs`, `stations.rs`, `merchant.rs`; game.rs `fn menu_ops`, `fn click_inventory`; G: `stations.rs`, `trading.rs`, `recipe_book.rs`, `machines.rs` |
-| Commands | parse: L: `command/` (`args.rs`, `selector.rs`, `tree_*.rs`, `vanilla.rs`); run: G: `commands.rs` (dispatch) + `commands/*.rs` (`admin`, `execute`, `items`, `players`, `world_cmds`...); L: `scoreboard_cmd.rs`, `data_cmd.rs`, `nbt_path.rs`; G: `functions.rs`, `command_blocks.rs` |
+| Commands | parse: crate `horizon-command` (`args.rs`, `selector.rs`, `tree_*.rs`, `vanilla.rs`); run: G: `commands.rs` (dispatch) + `commands/*.rs` (`admin`, `execute`, `items`, `players`, `world_cmds`...); L: `scoreboard_cmd.rs`, `data_cmd.rs`; `horizon-client-core`: `nbt_path.rs`, `scoreboard.rs`; G: `functions.rs`, `command_blocks.rs` |
 | UI screens | `Screen` enum in game.rs; L: `title.rs` + `title/`, `options_ui.rs`, `multiplayer.rs`, `pack_screen.rs`, `graphics_ui.rs`, `screen_draw.rs`, `ui.rs` (widgets), `hud.rs`, `hud_layout.rs`, `hud_overlays.rs`, `chat.rs`, `tab_list.rs`; G: `startup_menu.rs`, `screens.rs` (pause, death), `options.rs`, `lan_screen.rs`, `chat.rs`, `sign_edit.rs`, `books.rs` |
 | Multiplayer client | L: `net.rs` (network thread); G: `remote.rs` (`fn handle_packet`, `fn tick_remote`), `remote_*.rs` (mob data, objects, projectiles, vehicles, stations) |
 | LAN host / server side | L: `lan/` (`conn.rs` handshake + login threads, `hub.rs` + `hub/` play state, `chunks.rs`, `entity.rs`, `tracking.rs`, `guest.rs`, `playerdata.rs`); G: `lan.rs` (`LanHost`), `lan_actions.rs` (`fn as_guest`, `fn tick_guests`), `lan_*.rs` per feature, `lan_entities.rs` (tracked entities) |
 | Integrated server | G: `integrated.rs` (the server thread), `levels.rs` (one level per dimension, `fn tick_server`), `server_travel.rs` |
 | Dedicated server | G: `dedicated.rs`, `dedicated/status.rs`; crates `horizon-server-files`, `horizon-server` |
-| Save and load | L: `save.rs` (level.dat, regions, playerdata), `entity_nbt.rs`, `block_entity_nbt.rs`, `options_file.rs`; G: `saving.rs`, `persist.rs` (entities); `crates/horizon-world/src/{region.rs,nbt.rs,datafix/}` |
+| Save and load | L: `save.rs` (level.dat, regions, playerdata), `entity_nbt.rs`, `options_file.rs`; `horizon-client-core/src/block_entity_nbt.rs`; G: `saving.rs`, `persist.rs` (entities); `crates/horizon-world/src/{region.rs,nbt.rs,datafix/}` |
 | Input | game.rs `fn window_event`, `fn key_pressed`, `fn play_mouse`; L: `keybinds.rs`, `keymapping.rs`, `key_names.rs`, `mouse.rs`, `input.rs`, `interaction_input.rs`, `gamepad.rs`, `osk.rs`, `clipboard.rs`; G: `pad.rs`, `pad_menu.rs` |
 | Audio | L: `audio.rs` (mixer), `sound_engine.rs`, `sound_events.rs`, `music.rs`, `ambience.rs`; G: `music.rs`, `subtitle_hud.rs` |
-| Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`, `lang.rs`; crate `horizon-assets`; G: `packs.rs` |
+| Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`; `horizon-client-core/src/lang.rs`; crate `horizon-assets`; G: `packs.rs` |
 | Agent control | L: `control.rs` (socket), `bin/horizon-ctl/`; G: `control.rs`, `agent.rs`, `events.rs`, `ui_control.rs` ([docs/agent-control.md](docs/agent-control.md)) |
 | Mods | crate `horizon-mods`; G: `mods.rs`; L: `mod_content.rs`, `mod_list.rs` |
 | Horizon extras, settings | L: `extras.rs`, `graphics.rs`, `settings.rs`, `minimap.rs`; G: `extras.rs`, `tweaks.rs`, `options.rs` |

Cargo.lock

@@ -216,6 +216,13 @@ version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
+[[package]]
+name = "beacons"
+version = "0.1.0"
+dependencies = [
+ "horizon-mod-sdk",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.10.0"
@@ -923,6 +930,13 @@ version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b5343afd4a8365a643ac588dab4cf234a190c7f6c88c9f6dd6ffe00837661b7"
 
+[[package]]
+name = "far-view"
+version = "1.0.0"
+dependencies = [
+ "horizon-mod-sdk",
+]
+
 [[package]]
 name = "fdeflate"
 version = "0.3.7"
@@ -1365,6 +1379,8 @@ dependencies = [
  "glam",
  "horizon-assets",
  "horizon-bench",
+ "horizon-client-core",
+ "horizon-command",
  "horizon-core",
  "horizon-dualsense",
  "horizon-friends",
@@ -1389,6 +1405,7 @@ dependencies = [
  "sha1",
  "sha2",
  "symphonia",
+ "unicode-bidi",
  "ureq",
  "wgpu",
  "winit",
@@ -1396,6 +1413,23 @@ dependencies = [
  "zip",
 ]
 
+[[package]]
+name = "horizon-client-core"
+version = "0.1.0"
+dependencies = [
+ "horizon-world",
+ "serde_json",
+]
+
+[[package]]
+name = "horizon-command"
+version = "0.1.0"
+dependencies = [
+ "horizon-client-core",
+ "horizon-protocol",
+ "horizon-world",
+]
+
 [[package]]
 name = "horizon-core"
 version = "0.1.0"
@@ -2971,6 +3005,13 @@ dependencies = [
  "objc2-quartz-core 0.3.2",
 ]
 
+[[package]]
+name = "recipes"
+version = "1.0.0"
+dependencies = [
+ "horizon-mod-sdk",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -3734,6 +3775,12 @@ version = "1.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6f5e870be6c3b371b77fe0ee0bafb859fa4964b4404c27de1d380043c4dda20"
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c1cb5db39152898a79168971543b1cb5020dff7fe43c8dc468b0885f5e29df5"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.26"

Cargo.toml

@@ -1,6 +1,46 @@
 [workspace]
 exclude = ["launcher", "crates/horizon-telemetry-server", "crates/horizon-mod-registry", "third_party/wgpu-hal"]
-members = ["crates/horizon-core", "crates/horizon-dualsense", "crates/horizon-threads", "crates/horizon-hdr", "crates/horizon-world", "crates/horizon-client", "crates/horizon-server-files", "crates/horizon-server", "crates/horizon-bots", "crates/horizon-assets", "crates/horizon-protocol", "crates/horizon-theme", "crates/horizon-prepare", "crates/horizon-telemetry", "crates/horizon-bench", "crates/horizon-friends", "crates/horizon-relay", "crates/horizon-mod-sdk", "crates/horizon-mods", "crates/horizon-mods/tests/guest", "crates/horizon-mods/tests/ui_guest", "crates/cargo-horizon-mod", "crates/horizon-port-pack", "crates/horizon-shaders", "crates/horizon-shader-api", "crates/horizon-release-sign", "crates/horizon-mod-sdk/examples/coords-hud", "crates/horizon-mod-sdk/examples/predator-missile", "crates/horizon-mod-sdk/examples/welcome", "mods/official/fps-overlay", "mods/official/keystrokes", "mods/official/minimap", "mods/official/zoom", "xtask"]
+members = [
+    "crates/horizon-core",
+    "crates/horizon-dualsense",
+    "crates/horizon-threads",
+    "crates/horizon-hdr",
+    "crates/horizon-world",
+    "crates/horizon-client",
+    "crates/horizon-client-core",
+    "crates/horizon-command",
+    "crates/horizon-server-files",
+    "crates/horizon-server",
+    "crates/horizon-bots",
+    "crates/horizon-assets",
+    "crates/horizon-protocol",
+    "crates/horizon-theme",
+    "crates/horizon-prepare",
+    "crates/horizon-telemetry",
+    "crates/horizon-bench",
+    "crates/horizon-friends",
+    "crates/horizon-relay",
+    "crates/horizon-mod-sdk",
+    "crates/horizon-mods",
+    "crates/horizon-mods/tests/guest",
+    "crates/horizon-mods/tests/ui_guest",
+    "crates/cargo-horizon-mod",
+    "crates/horizon-port-pack",
+    "crates/horizon-shaders",
+    "crates/horizon-shader-api",
+    "crates/horizon-release-sign",
+    "crates/horizon-mod-sdk/examples/coords-hud",
+    "crates/horizon-mod-sdk/examples/predator-missile",
+    "crates/horizon-mod-sdk/examples/welcome",
+    "crates/horizon-mod-sdk/examples/beacons",
+    "mods/official/fps-overlay",
+    "mods/official/keystrokes",
+    "mods/official/far-view",
+    "mods/official/minimap",
+    "mods/official/zoom",
+    "xtask",
+    "mods/official/recipes",
+]
 resolver = "2"
 
 [workspace.package]

crates/cargo-horizon-mod/src/check.rs

@@ -200,7 +200,7 @@ fn play(path: &Path, report: &mut Report) -> Result<(), String> {
         return Err(format!("it didn't start: {reason}"));
     }
     let client: Vec<String> = mods.commands().map(str::to_owned).collect();
-    let server: Vec<String> = mods.server_commands().map(str::to_owned).collect();
+    let server: Vec<String> = mods.server_commands().map(|c| c.name.clone()).collect();
     report.commands = [client.clone(), server.clone()].concat();
     // A server mod plays with one player on, who joins, chats and leaves.
     let steve = ServerPlayer {
@@ -266,8 +266,17 @@ fn play(path: &Path, report: &mut Report) -> Result<(), String> {
                 format!("{} quiet command(s)", lines.len())
             }
             Output::Stopped { reason, .. } => return Err(format!("it stopped: {reason}")),
+            Output::SetBlocks {
+                dimension, blocks, ..
+            } => {
+                format!("set {} block(s) in {dimension}", blocks.len())
+            }
             Output::OpenScreen { .. } => "opened a screen".to_string(),
             Output::CloseScreen { .. } => "closed its screen".to_string(),
+            Output::PlaceRecipe { book_id, all } => {
+                format!("placed recipe {book_id}{}", if all { " (all)" } else { "" })
+            }
+            Output::Give { item, count, .. } => format!("gave {count} {item}"),
             Output::Shake { strength, seconds } => {
                 format!("shook the camera: {strength:.2} for {seconds:.1} s")
             }

crates/horizon-client-core/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "horizon-client-core"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version = "1.90"
+description = "The client's lowest layer: chat text and translations, SNBT and NBT paths, the scoreboard, boss bars, game rules and the registry and particle tables commands name"
+
+[dependencies]
+horizon-world = { path = "../horizon-world" }
+serde_json = { version = "1.0.151", features = ["raw_value"] }
+
+[lints]
+workspace = true

crates/horizon-client-core/src/block_entity_nbt.rs

@@ -259,7 +259,7 @@ fn is_pos(tag: &Tag) -> bool {
     matches!(tag, Tag::IntArray(v) if v.len() == 3)
 }
 /// The loaded `SignText` of one side, or the empty text.
-pub(crate) fn sign_side(tag: Option<&Tag>) -> Tag {
+pub fn sign_side(tag: Option<&Tag>) -> Tag {
     let empty = || string("");
     let mut messages: Vec<Tag> = match tag.and_then(|t| t.get("messages")) {
         Some(Tag::List(list)) => list.iter().filter_map(component).collect(),

crates/horizon-client-core/src/component.rs

@@ -252,7 +252,7 @@ pub fn to_text_with(
             } else if let Some(sel) = o.get("selector").and_then(Value::as_str) {
                 resolve(sel)
             } else if let Some(key) = o.get("keybind").and_then(Value::as_str) {
-                crate::keybinds::display_name(key)
+                crate::key_display::display_name(key)
             } else {
                 Text::empty()
             };

crates/horizon-client-core/src/gamerules.rs

@@ -292,27 +292,4 @@ mod tests {
         assert_eq!(GameRules::load(&dir), rules);
         let _ = fs::remove_dir_all(dir);
     }
-    /// The world's save (Level.write) writes the rules as they are now, and a
-    /// world opened again reads them back (#74).
-    #[test]
-    fn level_save_keeps_changed_rules() {
-        let dir =
-            std::env::temp_dir().join(format!("horizon-gamerules-level-{}", std::process::id()));
-        let _ = fs::remove_dir_all(&dir);
-        let mut level = crate::save::Level::default();
-        level.write(&dir).unwrap();
-        // Rules changed while playing, then saved and loaded again.
-        let mut rules = GameRules::load(&dir);
-        assert_eq!(rules, GameRules::default());
-        assert!(rules.set("advance_time", Value::Bool(false)));
-        assert!(rules.set("advance_weather", Value::Bool(false)));
-        assert!(rules.set("random_tick_speed", Value::Int(0)));
-        level.game_rules = rules.by_name();
-        level.write(&dir).unwrap();
-        assert_eq!(GameRules::load(&dir), rules);
-        let read = crate::save::Level::read(&dir).unwrap();
-        assert_eq!(read.game_rules, rules.by_name());
-        assert_eq!(read.game_rule("advance_time"), 0);
-        let _ = fs::remove_dir_all(dir);
-    }
 }

crates/horizon-client-core/src/identifier.rs

@@ -0,0 +1,18 @@
+//! Resource identifiers (`Identifier`).
+
+/// Identifier.parse: `ns:path` or `path`, validated.
+pub fn parse_identifier(raw: &str) -> Option<String> {
+    let (ns, path) = match raw.split_once(':') {
+        Some(("", path)) => ("minecraft", path),
+        Some((ns, path)) => (ns, path),
+        None => ("minecraft", raw),
+    };
+    let ns_ok = ns != ".."
+        && ns
+            .chars()
+            .all(|c| c.is_ascii_lowercase() || c.is_ascii_digit() || matches!(c, '_' | '.' | '-'));
+    let path_ok = path.chars().all(|c| {
+        c.is_ascii_lowercase() || c.is_ascii_digit() || matches!(c, '_' | '.' | '-' | '/')
+    });
+    (ns_ok && path_ok).then(|| format!("{ns}:{path}"))
+}

crates/horizon-client-core/src/key_display.rs

@@ -0,0 +1,38 @@
+//! Key display names (`InputConstants.Key.getDisplayName`), shared by key
+//! mappings and `keybind` text components.
+use crate::text::Text;
+
+/// InputConstants.Key.getDisplayName: one-character keys as the upper-case
+/// character, others by translation.
+pub fn display_name(key: &str) -> Text {
+    if let Some(rest) = key.strip_prefix("key.keyboard.")
+        && rest.chars().count() == 1
+    {
+        let c = rest.to_uppercase();
+        return Text::literal(c);
+    }
+    let symbol = match key {
+        "key.keyboard.minus" => Some("-"),
+        "key.keyboard.equal" => Some("="),
+        "key.keyboard.left.bracket" => Some("["),
+        "key.keyboard.right.bracket" => Some("]"),
+        "key.keyboard.backslash" => Some("\\"),
+        "key.keyboard.semicolon" => Some(";"),
+        "key.keyboard.apostrophe" => Some("'"),
+        "key.keyboard.grave.accent" => Some("`"),
+        "key.keyboard.comma" => Some(","),
+        "key.keyboard.period" => Some("."),
+        "key.keyboard.slash" => Some("/"),
+        _ => None,
+    };
+    if let Some(s) = symbol {
+        return Text::literal(s);
+    }
+    if let Some(n) = key.strip_prefix("key.mouse.")
+        && n.parse::<u32>().is_ok()
+        && !crate::lang::has(key)
+    {
+        return Text::translate("key.mouse", &[Text::literal(n)]);
+    }
+    Text::translate(key, &[])
+}

crates/horizon-client-core/src/lang.rs

@@ -4,7 +4,10 @@
 //! language used by every screen.
 use std::{
     collections::{BTreeMap, HashMap},
-    sync::{Arc, RwLock},
+    sync::{
+        Arc, RwLock,
+        atomic::{AtomicBool, Ordering},
+    },
 };
 
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -23,11 +26,16 @@ impl LanguageInfo {
 #[derive(Default)]
 pub struct Language {
     pub code: String,
+    /// `LanguageInfo.bidirectional`: text without a strong character reads
+    /// right to left (`ClientLanguage.defaultRightToLeft`).
+    bidirectional: bool,
     map: HashMap<String, String>,
 }
 pub const DEFAULT: &str = "en_us";
 
 static CURRENT: RwLock<Option<Arc<Language>>> = RwLock::new(None);
+/// The current language's `bidirectional`, read for every drawn string.
+static BIDIRECTIONAL: AtomicBool = AtomicBool::new(false);
 
 /// A source of resource files: the prepared root plus packs, highest priority last.
 pub trait ResourceSource {
@@ -42,8 +50,12 @@ struct Bundled;
 impl ResourceSource for Bundled {
     fn read(&self, path: &str) -> Option<Vec<u8>> {
         let body = match path {
-            "assets/horizon/lang/en_us.json" => include_str!("../assets/horizon/lang/en_us.json"),
-            "assets/horizon/lang/ru_ru.json" => include_str!("../assets/horizon/lang/ru_ru.json"),
+            "assets/horizon/lang/en_us.json" => {
+                include_str!("../../horizon-client/assets/horizon/lang/en_us.json")
+            }
+            "assets/horizon/lang/ru_ru.json" => {
+                include_str!("../../horizon-client/assets/horizon/lang/ru_ru.json")
+            }
             _ => return None,
         };
         Some(body.as_bytes().to_vec())
@@ -130,8 +142,12 @@ impl Language {
         {
             apply_deprecated(&mut map, &bytes);
         }
+        let bidirectional = available(sources)
+            .iter()
+            .any(|info| info.code == code && info.bidirectional);
         Self {
             code: code.to_owned(),
+            bidirectional,
             map,
         }
     }
@@ -193,11 +209,16 @@ pub fn available(sources: &[&dyn ResourceSource]) -> Vec<LanguageInfo> {
 }
 
 pub fn set(language: Language) {
+    BIDIRECTIONAL.store(language.bidirectional, Ordering::Relaxed);
     *CURRENT.write().unwrap_or_else(|e| e.into_inner()) = Some(Arc::new(language));
 }
 pub fn current() -> Option<Arc<Language>> {
     CURRENT.read().unwrap_or_else(|e| e.into_inner()).clone()
 }
+/// `ClientLanguage.defaultRightToLeft` of the current language.
+pub fn bidirectional() -> bool {
+    BIDIRECTIONAL.load(Ordering::Relaxed)
+}
 pub fn code() -> String {
     current().map_or_else(|| DEFAULT.to_owned(), |l| l.code.clone())
 }

crates/horizon-client-core/src/lib.rs

@@ -0,0 +1,23 @@
+//! The client's lowest layer, below commands and gameplay: chat text and
+//! translations, SNBT and NBT paths, text components, the scoreboard, boss
+//! bars, game rules, block entity NBT tables, and the registry, particle and
+//! sound source tables commands name. horizon-client re-exports each module
+//! under its old path (`horizon_client::text`, ...).
+#![forbid(unsafe_code)]
+pub mod block_entity_nbt;
+pub mod bossbar;
+pub mod component;
+pub mod fastutil_order;
+pub mod gamerules;
+pub mod identifier;
+pub mod key_display;
+pub mod lang;
+pub mod nbt_path;
+pub mod particle_type;
+pub mod registries;
+pub mod scoreboard;
+pub mod snbt;
+pub mod sound_source;
+pub mod text;
+pub mod uuid;
+pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;

crates/horizon-client-core/src/particle_type.rs

@@ -0,0 +1,209 @@
+//! Particle types (`ParticleTypes`): the vanilla particle types with a client
+//! implementation, by registry name, and their per-type flags.
+
+macro_rules! particle_types {
+    ($($variant:ident = $name:literal),* $(,)?) => {
+        /// Vanilla particle types with a client implementation here.
+        #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+        pub enum ParticleType { $($variant),* }
+        impl ParticleType {
+            pub const ALL: &'static [ParticleType] = &[$(ParticleType::$variant),*];
+            /// Registry path (`minecraft:<name>`), also the sprite-set file name.
+            pub fn name(self) -> &'static str {
+                match self { $(ParticleType::$variant => $name),* }
+            }
+            pub fn from_name(name: &str) -> Option<Self> {
+                let name = name.strip_prefix("minecraft:").unwrap_or(name);
+                match name { $($name => Some(ParticleType::$variant),)* _ => None }
+            }
+        }
+    };
+}
+particle_types! {
+    Block = "block",
+    BlockCrumble = "block_crumble",
+    Trail = "trail",
+    DustPillar = "dust_pillar",
+    FallingDust = "falling_dust",
+    Smoke = "smoke",
+    LargeSmoke = "large_smoke",
+    WhiteSmoke = "white_smoke",
+    Flame = "flame",
+    SoulFireFlame = "soul_fire_flame",
+    CopperFireFlame = "copper_fire_flame",
+    SmallFlame = "small_flame",
+    Lava = "lava",
+    DrippingWater = "dripping_water",
+    FallingWater = "falling_water",
+    DrippingLava = "dripping_lava",
+    FallingLava = "falling_lava",
+    LandingLava = "landing_lava",
+    DrippingHoney = "dripping_honey",
+    FallingHoney = "falling_honey",
+    LandingHoney = "landing_honey",
+    FallingNectar = "falling_nectar",
+    FallingSporeBlossom = "falling_spore_blossom",
+    SporeBlossomAir = "spore_blossom_air",
+    DrippingObsidianTear = "dripping_obsidian_tear",
+    FallingObsidianTear = "falling_obsidian_tear",
+    LandingObsidianTear = "landing_obsidian_tear",
+    DrippingDripstoneWater = "dripping_dripstone_water",
+    FallingDripstoneWater = "falling_dripstone_water",
+    DrippingDripstoneLava = "dripping_dripstone_lava",
+    FallingDripstoneLava = "falling_dripstone_lava",
+    Splash = "splash",
+    Rain = "rain",
+    Bubble = "bubble",
+    SulfurBubbles = "sulfur_bubbles",
+    BubblePop = "bubble_pop",
+    BubbleColumnUp = "bubble_column_up",
+    CurrentDown = "current_down",
+    Underwater = "underwater",
+    Portal = "portal",
+    ReversePortal = "reverse_portal",
+    Enchant = "enchant",
+    Nautilus = "nautilus",
+    VaultConnection = "vault_connection",
+    Crit = "crit",
+    EnchantedHit = "enchanted_hit",
+    DamageIndicator = "damage_indicator",
+    Heart = "heart",
+    AngryVillager = "angry_villager",
+    HappyVillager = "happy_villager",
+    Composter = "composter",
+    Mycelium = "mycelium",
+    Dolphin = "dolphin",
+    EggCrack = "egg_crack",
+    Poof = "poof",
+    Explosion = "explosion",
+    ExplosionEmitter = "explosion_emitter",
+    CampfireCosySmoke = "campfire_cosy_smoke",
+    CampfireSignalSmoke = "campfire_signal_smoke",
+    Note = "note",
+    Dust = "dust",
+    TotemOfUndying = "totem_of_undying",
+    Firework = "firework",
+    EndRod = "end_rod",
+    Ash = "ash",
+    WhiteAsh = "white_ash",
+    CrimsonSpore = "crimson_spore",
+    WarpedSpore = "warped_spore",
+    CherryLeaves = "cherry_leaves",
+    PaleOakLeaves = "pale_oak_leaves",
+    TintedLeaves = "tinted_leaves",
+    Effect = "effect",
+    InstantEffect = "instant_effect",
+    EntityEffect = "entity_effect",
+    Witch = "witch",
+    Infested = "infested",
+    Cloud = "cloud",
+    Sneeze = "sneeze",
+    Snowflake = "snowflake",
+    Soul = "soul",
+    SculkSoul = "sculk_soul",
+    DragonBreath = "dragon_breath",
+    Gust = "gust",
+    SmallGust = "small_gust",
+    GustEmitterLarge = "gust_emitter_large",
+    GustEmitterSmall = "gust_emitter_small",
+    DustColorTransition = "dust_color_transition",
+    SculkCharge = "sculk_charge",
+    SculkChargePop = "sculk_charge_pop",
+    Shriek = "shriek",
+    SonicBoom = "sonic_boom",
+    Vibration = "vibration",
+    SweepAttack = "sweep_attack",
+    Glow = "glow",
+    WaxOn = "wax_on",
+    WaxOff = "wax_off",
+    ElectricSpark = "electric_spark",
+    Scrape = "scrape",
+    SquidInk = "squid_ink",
+    GlowSquidInk = "glow_squid_ink",
+    Item = "item",
+    ItemSlime = "item_slime",
+    ItemSnowball = "item_snowball",
+    ItemCobweb = "item_cobweb",
+    SulfurCubeGoo = "sulfur_cube_goo",
+    Flash = "flash",
+    Firefly = "firefly",
+    TrialSpawnerDetection = "trial_spawner_detection",
+    TrialSpawnerDetectionOminous = "trial_spawner_detection_ominous",
+    TrialOmen = "trial_omen",
+    RaidOmen = "raid_omen",
+    OminousSpawning = "ominous_spawning",
+    Spit = "spit",
+    Fishing = "fishing",
+    DustPlume = "dust_plume",
+    RedPoplarLeaves = "red_poplar_leaves",
+    OrangePoplarLeaves = "orange_poplar_leaves",
+    YellowPoplarLeaves = "yellow_poplar_leaves",
+    PauseMobGrowth = "pause_mob_growth",
+    ResetMobGrowth = "reset_mob_growth",
+    BlockMarker = "block_marker",
+}
+impl ParticleType {
+    /// `ParticleType.getOverrideLimiter` (`ParticleTypes.register(name, true)`):
+    /// spawned regardless of distance.
+    pub fn override_limiter(self) -> bool {
+        matches!(
+            self,
+            Self::BlockMarker
+                | Self::DamageIndicator
+                | Self::ExplosionEmitter
+                | Self::Explosion
+                | Self::Gust
+                | Self::GustEmitterLarge
+                | Self::GustEmitterSmall
+                | Self::SonicBoom
+                | Self::SculkCharge
+                | Self::SculkChargePop
+                | Self::Vibration
+                | Self::Poof
+                | Self::Spit
+                | Self::SquidInk
+                | Self::SweepAttack
+                | Self::CampfireCosySmoke
+                | Self::CampfireSignalSmoke
+                | Self::GlowSquidInk
+                | Self::Glow
+                | Self::WaxOn
+                | Self::WaxOff
+                | Self::ElectricSpark
+                | Self::Scrape
+                | Self::TrialSpawnerDetection
+                | Self::TrialSpawnerDetectionOminous
+                | Self::VaultConnection
+                | Self::OminousSpawning
+        )
+    }
+    /// `SingleQuadParticle.Layer.translucent`: types whose vanilla particle class
+    /// hardcodes the translucent layer, drawn after translucent terrain.
+    /// `TerrainParticle`, `BreakingItemParticle` and `BlockMarker` resolve their
+    /// layer from the sprite instead (`Layer.bySprite`); see the `translucent`
+    /// sprite set on the engine.
+    pub fn translucent_layer(self) -> bool {
+        match self {
+            // CampfireSmokeParticle.
+            Self::CampfireCosySmoke | Self::CampfireSignalSmoke
+            // PlayerCloudParticle.
+            | Self::Cloud | Self::Sneeze
+            // SpellParticle.
+            | Self::Effect | Self::InstantEffect | Self::EntityEffect
+            | Self::Witch | Self::Infested | Self::TrialOmen | Self::RaidOmen
+            // EmissiveRisingParticle.
+            | Self::Soul | Self::SculkSoul
+            // SculkChargeParticle, SculkChargePopParticle, ShriekParticle,
+            // VibrationSignalParticle, FireflyParticle, OverlayParticle.
+            | Self::SculkCharge | Self::SculkChargePop | Self::Shriek
+            | Self::Vibration | Self::Firefly | Self::Flash
+            // SimpleAnimatedParticle and its subclasses: EndRodParticle,
+            // SparkParticle (firework), SquidInkParticle, TotemParticle.
+            | Self::EndRod | Self::Firework | Self::SquidInk | Self::GlowSquidInk
+            | Self::TotemOfUndying
+            // FlyTowardsPositionParticle: its LifetimeAlpha(0, 0.6, 0.25, 1) is not opaque.
+            | Self::VaultConnection => true,
+            _ => false,
+        }
+    }
+}

crates/horizon-client-core/src/registries.rs

@@ -0,0 +1,188 @@
+//! Registry contents and source state that commands validate and complete
+//! arguments against (what the server's registry access holds).
+use std::collections::BTreeMap;
+
+/// Registry contents and source state used to validate and complete arguments.
+#[derive(Clone, Debug, Default)]
+pub struct Registries {
+    /// Permission level of the command source.
+    pub permission: u8,
+    pub items: Vec<String>,
+    pub item_tags: Vec<String>,
+    /// Block id -> (property, allowed values).
+    pub blocks: BTreeMap<String, Vec<(String, Vec<String>)>>,
+    pub block_tags: Vec<String>,
+    /// Entity types that `summon` can create.
+    pub summonable: Vec<String>,
+    /// Every entity type (selector `type=`).
+    pub entity_types: Vec<String>,
+    pub effects: Vec<String>,
+    pub enchantments: Vec<String>,
+    pub structures: Vec<String>,
+    pub biomes: Vec<String>,
+    pub dimensions: Vec<String>,
+    pub clocks: Vec<String>,
+    pub timelines: Vec<String>,
+    pub time_markers: Vec<String>,
+    pub advancements: Vec<String>,
+    /// Game rule name -> integer-valued.
+    pub game_rules: Vec<(String, bool)>,
+    pub players: Vec<String>,
+    /// Scoreboard objective names, team names and tracked score holders.
+    pub objectives: Vec<String>,
+    pub teams: Vec<String>,
+    pub tracked: Vec<String>,
+    /// Loaded datapack functions (`ns:path`) and function tags (`ns:path`).
+    pub functions: Vec<String>,
+    /// `/data ... storage` ids.
+    pub storages: Vec<String>,
+    /// Boss bar ids and datapack predicate ids.
+    pub bossbars: Vec<String>,
+    pub predicates: Vec<String>,
+    pub item_modifiers: Vec<String>,
+    pub schedules: Vec<String>,
+    pub stopwatches: Vec<String>,
+    pub recipes: Vec<String>,
+    pub sounds: Vec<String>,
+    pub damage_types: Vec<String>,
+    pub attributes: Vec<String>,
+    pub loot_tables: Vec<String>,
+    pub templates: Vec<String>,
+    pub random_sequences: Vec<String>,
+    pub datapacks_enabled: Vec<String>,
+    pub datapacks_disabled: Vec<String>,
+    pub function_tags: Vec<String>,
+    /// The block the source is looking at (relevant coordinates).
+    pub target_block: Option<[i32; 3]>,
+    /// Every registry's element and tag ids (`minecraft:item` -> ...), as
+    /// the server's registry access and reloadable registries hold them.
+    pub by_registry: BTreeMap<String, RegistryIds>,
+    /// Blocks whose default state has a block entity.
+    pub block_entities: std::collections::BTreeSet<String>,
+    /// Block tag -> member blocks.
+    pub block_tag_members: BTreeMap<String, Vec<String>>,
+    /// Data component types with a codec (not transient).
+    pub persistent_components: Vec<String>,
+    /// Recipes `/recipe` can give (not special).
+    pub learnable_recipes: Vec<String>,
+    /// Advancement id -> criterion names.
+    pub advancement_criteria: BTreeMap<String, Vec<String>>,
+    /// World clock -> time markers shown in commands.
+    pub clock_time_markers: BTreeMap<String, Vec<String>>,
+    /// Trigger objectives the source may use (`/trigger` suggestions).
+    pub trigger_objectives: Vec<String>,
+    /// Objectives with the `trigger` criterion -> holder -> whether its score is locked.
+    pub trigger_scores: BTreeMap<String, BTreeMap<String, bool>>,
+}
+/// The ids and tag ids of one registry.
+#[derive(Clone, Debug, Default)]
+pub struct RegistryIds {
+    pub ids: Vec<String>,
+    pub tags: Vec<String>,
+}
+const EMPTY: &[String] = &[];
+impl Registries {
+    /// Fill what the game did not build itself from vanilla's exported
+    /// registries (`command-registries.json`, written by
+    /// `VanillaCommandParseOracle registries`): built-in registries such as
+    /// mob effects, data component types and dialogs, block entities and tag
+    /// members. Registries that data packs reload stay with the game.
+    pub fn fill_from_export(&mut self, r: &serde_json::Value) {
+        fn strings(v: &serde_json::Value) -> Vec<String> {
+            v.as_array()
+                .map(|a| {
+                    a.iter()
+                        .filter_map(|x| x.as_str().map(str::to_owned))
+                        .collect()
+                })
+                .unwrap_or_default()
+        }
+        let fill = |field: &mut Vec<String>, key: &str| {
+            if field.is_empty() {
+                *field = strings(&r[key]);
+            }
+        };
+        fill(&mut self.effects, "effects");
+        fill(&mut self.enchantments, "enchantments");
+        fill(&mut self.attributes, "attributes");
+        fill(&mut self.damage_types, "damage_types");
+        fill(&mut self.templates, "templates");
+        fill(&mut self.persistent_components, "persistent_components");
+        fill(&mut self.learnable_recipes, "learnable_recipes");
+        const RELOADED: [&str; 5] = [
+            "minecraft:advancement",
+            "minecraft:recipe",
+            "minecraft:loot_table",
+            "minecraft:predicate",
+            "minecraft:item_modifier",
+        ];
+        for (name, entry) in r["by_registry"].as_object().into_iter().flatten() {
+            if RELOADED.contains(&name.as_str()) || self.by_registry.contains_key(name) {
+                continue;
+            }
+            self.by_registry.insert(
+                name.clone(),
+                RegistryIds {
+                    ids: strings(&entry["ids"]),
+                    tags: strings(&entry["tags"]),
+                },
+            );
+        }
+        if self.block_entities.is_empty() {
+            self.block_entities = strings(&r["block_entities"]).into_iter().collect();
+        }
+        if self.block_tag_members.is_empty() {
+            for (tag, members) in r["block_tag_members"].as_object().into_iter().flatten() {
+                self.block_tag_members.insert(tag.clone(), strings(members));
+            }
+        }
+        if self.clock_time_markers.is_empty() {
+            for (clock, markers) in r["clock_time_markers"].as_object().into_iter().flatten() {
+                self.clock_time_markers
+                    .insert(clock.clone(), strings(markers));
+            }
+        }
+        if self.advancement_criteria.is_empty() {
+            for (id, criteria) in r["advancement_criteria"].as_object().into_iter().flatten() {
+                self.advancement_criteria
+                    .insert(id.clone(), strings(criteria));
+            }
+        }
+    }
+    /// The element ids of a registry (sorted).
+    pub fn ids(&self, registry: &str) -> &[String] {
+        if let Some(r) = self.by_registry.get(registry) {
+            return &r.ids;
+        }
+        match registry {
+            "minecraft:item" => &self.items,
+            "minecraft:entity_type" => &self.entity_types,
+            "minecraft:mob_effect" => &self.effects,
+            "minecraft:enchantment" => &self.enchantments,
+            "minecraft:worldgen/structure" => &self.structures,
+            "minecraft:worldgen/biome" => &self.biomes,
+            "minecraft:world_clock" => &self.clocks,
+            "minecraft:timeline" => &self.timelines,
+            "minecraft:attribute" => &self.attributes,
+            "minecraft:damage_type" => &self.damage_types,
+            "minecraft:sound_event" => &self.sounds,
+            "minecraft:predicate" => &self.predicates,
+            "minecraft:item_modifier" => &self.item_modifiers,
+            "minecraft:loot_table" => &self.loot_tables,
+            "minecraft:recipe" => &self.recipes,
+            "minecraft:advancement" => &self.advancements,
+            _ => EMPTY,
+        }
+    }
+    /// The tag ids of a registry (sorted).
+    pub fn tags(&self, registry: &str) -> &[String] {
+        if let Some(r) = self.by_registry.get(registry) {
+            return &r.tags;
+        }
+        match registry {
+            "minecraft:item" => &self.item_tags,
+            "minecraft:block" => &self.block_tags,
+            _ => EMPTY,
+        }
+    }
+}

crates/horizon-client-core/src/scoreboard.rs

@@ -2,9 +2,9 @@
 //! `ObjectiveCriteria`, `NumberFormat`) and its saved data
 //! (`data/minecraft/scoreboard.dat`, `ScoreboardSaveData.Packed`).
 use crate::{
-    command::Registries,
     component,
     fastutil_order::{HashSetOrder, OpenOrder},
+    registries::Registries,
     text::{self, Style, Text},
 };
 use horizon_world::nbt::Tag;
@@ -1266,7 +1266,7 @@ fn entity_uuids(tag: &mut Tag) {
                             })
                             .collect::<Option<Vec<i32>>>(),
                         Tag::String(s) => {
-                            crate::save::uuid_from_text(&s.to_string_lossy()).map(Vec::from)
+                            crate::uuid::uuid_from_text(&s.to_string_lossy()).map(Vec::from)
                         }
                         _ => None,
                     };

crates/horizon-client-core/src/sound_source.rs

@@ -0,0 +1,7 @@
+//! Sound sources (`SoundSource`), by name.
+
+/// SoundSource names in vanilla order.
+pub const SOUND_SOURCES: [&str; 11] = [
+    "master", "music", "record", "weather", "block", "hostile", "neutral", "player", "ambient",
+    "voice", "ui",
+];

crates/horizon-client-core/src/text.rs

@@ -67,7 +67,7 @@ pub struct Style {
 }
 /// A style's `font` field: an identifier (`alt` is `minecraft:alt`).
 pub fn font_id(v: &Value) -> Option<String> {
-    crate::command::args::parse_identifier(v.as_str()?)
+    crate::identifier::parse_identifier(v.as_str()?)
 }
 impl Style {
     pub fn color(c: u32) -> Self {

crates/horizon-client-core/src/uuid.rs

@@ -0,0 +1,24 @@
+//! UUIDs as vanilla's four-int form, to and from their text form.
+
+pub fn uuid_text(u: [i32; 4]) -> String {
+    let hex: String = u.iter().map(|v| format!("{:08x}", *v as u32)).collect();
+    format!(
+        "{}-{}-{}-{}-{}",
+        &hex[0..8],
+        &hex[8..12],
+        &hex[12..16],
+        &hex[16..20],
+        &hex[20..32]
+    )
+}
+pub fn uuid_from_text(s: &str) -> Option<[i32; 4]> {
+    let hex: String = s.chars().filter(|c| *c != '-').collect();
+    if hex.len() != 32 {
+        return None;
+    }
+    let mut out = [0i32; 4];
+    for (i, v) in out.iter_mut().enumerate() {
+        *v = u32::from_str_radix(&hex[i * 8..i * 8 + 8], 16).ok()? as i32;
+    }
+    Some(out)
+}

crates/horizon-client/Cargo.toml

@@ -9,6 +9,8 @@ description = "Horizon native development client"
 
 [dependencies]
 horizon-assets = { path = "../horizon-assets" }
+horizon-client-core = { path = "../horizon-client-core" }
+horizon-command = { path = "../horizon-command" }
 horizon-core = { path = "../horizon-core" }
 # The server thread ahead of the workers (MinecraftServer.spin's Thread.setPriority).
 horizon-threads = { path = "../horizon-threads" }
@@ -60,6 +62,7 @@ gilrs = { version = "0.11", optional = true }
 horizon-dualsense = { path = "../horizon-dualsense", optional = true }
 # HTTPS to the Minecraft services (online-mode session join).
 ureq = { version = "2", default-features = false, features = ["tls"] }
+unicode-bidi = "0.3.18"
 
 [target.'cfg(unix)'.dependencies]
 # The server thread's CPU time per tick (`HORIZON_SPIKES`, spans.rs).

crates/horizon-client/examples/probe/arrow_probe.rs

@@ -163,6 +163,8 @@ pub fn main() -> Result<()> {
                                     ArrowSound::HitGround => "hit",
                                     ArrowSound::Splash => "splash",
                                     ArrowSound::Extinguish => "extinguish",
+                                    ArrowSound::TridentHitGround => "trident_hit_ground",
+                                    ArrowSound::TridentHit => "trident_hit",
                                 },
                                 volume.to_bits(),
                                 pitch.to_bits()

crates/horizon-client/examples/probe/entity_anim_fixture.rs

@@ -592,6 +592,7 @@ pub fn main() -> horizon_client::Result<()> {
                     pose,
                     num("maxCrossbowChageDuration"),
                     num("ticksUsingItem"),
+                    false,
                 );
             }
             Species::Evoker | Species::Illusioner | Species::Pillager | Species::Vindicator => {

crates/horizon-client/examples/probe/finalize_spawn_fixture.rs

@@ -154,11 +154,11 @@ const MEMORIES: [&str; 7] = [
 fn variant(m: &Mob, regs: &SpawnRegistries, v: &mut Vec<String>) {
     use Species as S;
     let s = m.species();
-    let named = |reg: &finalize::VariantRegistry, i: u8| {
-        format!(
-            "minecraft:{}",
+    let named = |reg: &finalize::VariantRegistry, i: Option<u8>| {
+        let name = i.map_or("classic", |i| {
             reg.names.get(i as usize).map_or("?", |n| n.as_str())
-        )
+        });
+        format!("minecraft:{name}")
     };
     let var = format!("minecraft:{}", finalize::variant_name(s, m.extra.variant));
     match s {

crates/horizon-client/examples/probe/mob_ai_probe.rs

@@ -1061,6 +1061,7 @@ pub fn main() -> horizon_client::Result<()> {
                 uuid: PLAYER_UUID,
                 allies: Default::default(),
                 remote: false,
+                passenger: false,
             }
         });
         let mut scratch = LegacyRandom::new(0);

crates/horizon-client/examples/probe/recipe_book_fixture.rs

@@ -5,6 +5,10 @@
 //!
 //! usage: recipe_book_fixture RESOURCES CASES OUTPUT
 use horizon_client::recipe_book::{BookType, RecipeIndex, Settings};
+use horizon_protocol::{
+    buf::{Codec, Reader, Writer},
+    packets::recipes::RecipeBookChangeSettings,
+};
 use horizon_world::nbt::Tag;
 use serde_json::Value;
 use std::{collections::BTreeSet, fs, path::Path};
@@ -93,8 +97,23 @@ pub fn main() -> horizon_client::Result<()> {
                         _ => BookType::Smoker,
                     }
                     .index();
-                    book.open[i] = op["open"].as_bool().unwrap_or(false);
-                    book.filtering[i] = op["filtering"].as_bool().unwrap_or(false);
+                    let packet = RecipeBookChangeSettings {
+                        book_type: i as i32,
+                        open: op["open"].as_bool().unwrap_or(false),
+                        filtering: op["filtering"].as_bool().unwrap_or(false),
+                    };
+                    let mut wire = Writer::new();
+                    RecipeBookChangeSettings::write(&packet, &mut wire);
+                    extra = format!(
+                        " packet={}",
+                        wire.data
+                            .iter()
+                            .map(|b| format!("{b:02x}"))
+                            .collect::<String>()
+                    );
+                    let decoded = RecipeBookChangeSettings::read(&mut Reader::new(&wire.data))?;
+                    book.open[decoded.book_type as usize] = decoded.open;
+                    book.filtering[decoded.book_type as usize] = decoded.filtering;
                 }
                 "save" => {
                     let tag = book.write();

crates/horizon-client/examples/probe/scene_motion_probe.rs

@@ -353,6 +353,7 @@ pub fn main() -> Result<()> {
                             horizon_world::food::Difficulty::Hard,
                         ][op["difficulty"].as_u64().unwrap() as usize],
                         natural_regeneration: op["regenerate"].as_bool().unwrap(),
+                        ..Default::default()
                     };
                 }
                 "food" => {

crates/horizon-client/src/animate_tick.rs

@@ -35,8 +35,9 @@ enum Animate {
     Campfire {
         spawn_particles: bool,
     },
-    /// Leaves: optional falling-leaf particle and chance, tinted by foliage.
-    Leaves(Option<(T, f32)>),
+    /// Leaves: optional falling-leaf particle and chance; a tinted leaf takes
+    /// the biome foliage colour unless a fixed colour is given (azalea).
+    Leaves(Option<(T, f32)>, Option<u32>),
     NetherPortal,
     EnchantingTable,
     EndRod([i32; 3]),
@@ -49,6 +50,8 @@ enum Animate {
     EnderChest,
     /// FallingBlock with its dust colour.
     Falling(u32),
+    /// A beehive or bee nest full of honey (`BeehiveBlock.animateTick`).
+    Beehive,
     RedstoneOre,
     RedstoneWire {
         power: u8,
@@ -70,6 +73,8 @@ enum Animate {
         waterlogged: bool,
     },
     EndPortal,
+    /// `WetSpongeBlock.animateTick`.
+    WetSponge,
 }
 fn step(facing: &str) -> [i32; 3] {
     match facing {
@@ -104,10 +109,17 @@ fn classify(name: &str, prop: &dyn Fn(&str) -> Option<String>) -> Animate {
             spawn_particles: false,
         },
         "oak_leaves" | "birch_leaves" | "jungle_leaves" | "acacia_leaves" | "dark_oak_leaves"
-        | "mangrove_leaves" => Animate::Leaves(Some((T::TintedLeaves, 0.01))),
-        "cherry_leaves" => Animate::Leaves(Some((T::CherryLeaves, 0.1))),
-        "pale_oak_leaves" => Animate::Leaves(Some((T::PaleOakLeaves, 0.02))),
-        "spruce_leaves" | "azalea_leaves" | "flowering_azalea_leaves" => Animate::Leaves(None),
+        | "mangrove_leaves" => Animate::Leaves(Some((T::TintedLeaves, 0.01)), None),
+        "cherry_leaves" => Animate::Leaves(Some((T::CherryLeaves, 0.1)), None),
+        "pale_oak_leaves" => Animate::Leaves(Some((T::PaleOakLeaves, 0.02)), None),
+        "red_poplar_leaves" => Animate::Leaves(Some((T::RedPoplarLeaves, 0.01)), None),
+        "orange_poplar_leaves" => Animate::Leaves(Some((T::OrangePoplarLeaves, 0.01)), None),
+        "yellow_poplar_leaves" => Animate::Leaves(Some((T::YellowPoplarLeaves, 0.01)), None),
+        // The azalea blocks drop tinted leaves of the fixed colour -9399763.
+        "azalea_leaves" | "flowering_azalea_leaves" => {
+            Animate::Leaves(Some((T::TintedLeaves, 0.01)), Some(0x0070_922D))
+        }
+        "spruce_leaves" => Animate::Leaves(None, None),
         "nether_portal" => Animate::NetherPortal,
         "enchanting_table" => Animate::EnchantingTable,
         "end_rod" => Animate::EndRod(facing()),
@@ -119,6 +131,14 @@ fn classify(name: &str, prop: &dyn Fn(&str) -> Option<String>) -> Animate {
         "sand" => Animate::Falling(0xDBD3A0),
         "red_sand" => Animate::Falling(0xA95821),
         "gravel" => Animate::Falling(0x807C7B),
+        // AnvilBlock/ConcretePowderBlock.getDustColor is the map colour;
+        // DragonEggBlock's is black.
+        "anvil" | "chipped_anvil" | "damaged_anvil" => Animate::Falling(0xA7A7A7),
+        "dragon_egg" => Animate::Falling(0x000000),
+        _ if name.ends_with("_concrete_powder") => Animate::Falling(concrete_powder_color(
+            name.trim_end_matches("_concrete_powder"),
+        )),
+        "beehive" | "bee_nest" if prop("honey_level").as_deref() == Some("5") => Animate::Beehive,
         "redstone_ore" | "deepslate_redstone_ore" if lit => Animate::RedstoneOre,
         "redstone_wire" => {
             let power = prop("power").and_then(|p| p.parse().ok()).unwrap_or(0);
@@ -149,6 +169,10 @@ fn classify(name: &str, prop: &dyn Fn(&str) -> Option<String>) -> Animate {
             waterlogged: prop("waterlogged").as_deref() == Some("true"),
         },
         "end_portal" => Animate::EndPortal,
+        "wet_sponge" => Animate::WetSponge,
+        // BrushableBlock has no dust colour of its own, so the dust is the map colour.
+        "suspicious_sand" => Animate::Falling(0xF7E9A3),
+        "suspicious_gravel" => Animate::Falling(0x707070),
         "sculk_sensor" | "calibrated_sculk_sensor"
             if prop("sculk_sensor_phase").as_deref() == Some("active") =>
         {
@@ -161,6 +185,27 @@ fn classify(name: &str, prop: &dyn Fn(&str) -> Option<String>) -> Animate {
         _ => Animate::None,
     }
 }
+/// `DyeColor.getMapColor` of a concrete powder colour.
+fn concrete_powder_color(dye: &str) -> u32 {
+    match dye {
+        "white" => 0xFFFFFF,
+        "orange" => 0xD87F33,
+        "magenta" => 0xB24CD8,
+        "light_blue" => 0x6699D8,
+        "yellow" => 0xE5E533,
+        "lime" => 0x7FCC19,
+        "pink" => 0xF27FA5,
+        "gray" => 0x4C4C4C,
+        "light_gray" => 0x999999,
+        "cyan" => 0x4C7F99,
+        "purple" => 0x7F3FB2,
+        "blue" => 0x334CB2,
+        "brown" => 0x664C33,
+        "green" => 0x667F33,
+        "red" => 0x993333,
+        _ => 0x191919,
+    }
+}
 /// `RedstoneWireBlock.COLORS`.
 fn redstone_color(power: u8) -> [f32; 3] {
     let f = f32::from(power) / 15.0;
@@ -504,6 +549,53 @@ fn try_spawn_drip(
         }
     }
 }
+/// `BeehiveBlock.trySpawnDripParticles`.
+fn beehive_drip(
+    tables: &AnimateTables,
+    engine: &mut ParticleEngine,
+    ctx: &AnimateContext,
+    state: BlockStateId,
+    pos: [i32; 3],
+) {
+    if ctx.facts.get(state).fluid != Fluid::None || engine.random().next_float() < 0.3 {
+        return;
+    }
+    let Some((bottom, top, bounds)) = ctx.shape_y(pos) else {
+        return;
+    };
+    if top < 1.0
+        || tables
+            .impermeable
+            .get(state.0 as usize)
+            .copied()
+            .unwrap_or(false)
+    {
+        return;
+    }
+    let y = if bottom > 0.0 {
+        f64::from(pos[1]) + bottom - 0.05
+    } else {
+        let below = [pos[0], pos[1] - 1, pos[2]];
+        let below_top = ctx.shape_y(below).map_or(1.0, |s| s.1);
+        // `belowTop < 1 || !isCollisionShapeFullBlock` and no fluid below.
+        if (below_top < 1.0 || !ctx.sturdy(below))
+            && ctx.facts.get(ctx.state(below)).fluid == Fluid::None
+        {
+            f64::from(pos[1]) - 0.05
+        } else {
+            return;
+        }
+    };
+    let r = engine.random();
+    let (a, b) = (r.next_double(), r.next_double());
+    let (fx, fz) = (f64::from(pos[0]), f64::from(pos[2]));
+    let p = [
+        fx + bounds[0] + (bounds[1] - bounds[0]) * a,
+        y,
+        fz + bounds[2] + (bounds[3] - bounds[2]) * b,
+    ];
+    add(engine, T::DrippingHoney, p, [0.0; 3]);
+}
 /// `WaterFluid.animateTick` / `LavaFluid.animateTick`.
 fn fluid_animate_tick(
     engine: &mut ParticleEngine,
@@ -685,7 +777,7 @@ fn block_animate_tick(
                 }
             }
         }
-        Animate::Leaves(falling) => {
+        Animate::Leaves(falling, fixed_tint) => {
             let below = [pos[0], pos[1] - 1, pos[2]];
             // LeavesBlock.makeDrippingWaterParticles.
             if (ctx.raining_at)([pos[0], pos[1] + 1, pos[2]]) && next_int(engine.random(), 15) == 1
@@ -705,7 +797,7 @@ fn block_animate_tick(
                 let r = engine.random();
                 let p = [fx + r.next_double(), fy - 0.05, fz + r.next_double()];
                 let options = if ty == T::TintedLeaves {
-                    let c = ctx.foliage(pos);
+                    let c = fixed_tint.unwrap_or_else(|| ctx.foliage(pos));
                     let f = |s: u32| ((c >> s) & 255) as f32 / 255.0;
                     ParticleOptions::colored(ty, [f(16), f(8), f(0), 1.0])
                 } else {
@@ -877,6 +969,36 @@ fn block_animate_tick(
                 }
             }
         }
+        Animate::WetSponge => {
+            // Direction.getRandom: DOWN, UP, NORTH, SOUTH, WEST, EAST.
+            const DIRECTIONS: [[i32; 3]; 6] = [
+                [0, -1, 0],
+                [0, 1, 0],
+                [0, 0, -1],
+                [0, 0, 1],
+                [-1, 0, 0],
+                [1, 0, 0],
+            ];
+            let d = DIRECTIONS[next_int(engine.random(), 6) as usize];
+            // The sponge occludes, so only a sturdy neighbour face hides the drip.
+            if d != [0, 1, 0] && !ctx.sturdy([pos[0] + d[0], pos[1] + d[1], pos[2] + d[2]]) {
+                let r = engine.random();
+                let p = match d {
+                    [0, -1, 0] => [fx + r.next_double(), fy - 0.05, fz + r.next_double()],
+                    [dx, _, 0] => {
+                        let y = fy + r.next_double() * 0.8;
+                        let z = fz + r.next_double();
+                        [fx + if dx > 0 { 1.1 } else { 0.05 }, y, z]
+                    }
+                    [_, _, dz] => {
+                        let y = fy + r.next_double() * 0.8;
+                        let x = fx + r.next_double();
+                        [x, y, fz + if dz > 0 { 1.1 } else { 0.05 }]
+                    }
+                };
+                add(engine, T::DrippingWater, p, [0.0; 3]);
+            }
+        }
         Animate::Mycelium => {
             let r = engine.random();
             if next_int(r, 10) == 0 {
@@ -977,6 +1099,13 @@ fn block_animate_tick(
                 }
             }
         }
+        Animate::Beehive => {
+            // BeehiveBlock.animateTick: nextInt(1) + 1 attempts.
+            let attempts = next_int(engine.random(), 1) + 1;
+            for _ in 0..attempts {
+                beehive_drip(tables, engine, ctx, state, pos);
+            }
+        }
         Animate::RedstoneOre => {
             for d in [
                 [0, -1, 0],
@@ -1209,21 +1338,32 @@ fn candle(engine: &mut ParticleEngine, p: [f64; 3]) {
     }
     add(engine, T::SmallFlame, p, [0.0; 3]);
 }
-/// `CampfireBlockEntity.particleTick` for every lit campfire (no cooking items).
+/// `CampfireBlockEntity.particleTick` for every lit campfire; `cooking` says
+/// which of a campfire's four slots hold an item.
 pub fn campfire_particles<'a>(
     tables: &AnimateTables,
     engine: &mut ParticleEngine,
     ctx: &AnimateContext,
     blocks: impl Iterator<Item = &'a ([i32; 3], u32)>,
+    cooking: &dyn Fn([i32; 3]) -> [bool; 4],
 ) {
     for &(pos, state) in blocks {
         if !tables.is_lit_campfire(state) {
             continue;
         }
-        let signal = ctx
+        let properties = ctx
             .registry
             .state(BlockStateId(state))
-            .is_some_and(|s| s.properties.get("signal_fire").map(String::as_str) == Some("true"));
+            .map(|s| &s.properties);
+        let prop = |k: &str| properties.and_then(|p| p.get(k)).map(String::as_str);
+        let signal = prop("signal_fire") == Some("true");
+        // Direction.get2DDataValue: south, west, north, east.
+        let rotation = match prop("facing") {
+            Some("west") => 1,
+            Some("north") => 2,
+            Some("east") => 3,
+            _ => 0,
+        };
         let r = engine.random();
         if r.next_float() < 0.11 {
             let count = next_int(r, 2) + 2;
@@ -1231,6 +1371,28 @@ pub fn campfire_particles<'a>(
                 make_campfire_smoke(engine, pos, signal, false);
             }
         }
+        // The smoke over each cooking item, at the slot's corner of the fire.
+        let occupied = cooking(pos);
+        for (slot, _) in occupied.iter().enumerate().filter(|(_, held)| **held) {
+            if engine.random().next_float() >= 0.2 {
+                continue;
+            }
+            // Direction.from2DDataValue((slot + rotation) % 4) and its clockwise side.
+            let (step, clockwise) = match (slot + rotation) % 4 {
+                0 => ([0.0, 1.0], [-1.0, 0.0]),
+                1 => ([-1.0, 0.0], [0.0, -1.0]),
+                2 => ([0.0, -1.0], [1.0, 0.0]),
+                _ => ([1.0, 0.0], [0.0, 1.0]),
+            };
+            let at = [
+                f64::from(pos[0]) + 0.5 - step[0] * 0.3125 + clockwise[0] * 0.3125,
+                f64::from(pos[1]) + 0.5,
+                f64::from(pos[2]) + 0.5 - step[1] * 0.3125 + clockwise[1] * 0.3125,
+            ];
+            for _ in 0..4 {
+                add(engine, T::Smoke, at, [0.0, 5.0e-4, 0.0]);
+            }
+        }
     }
 }
 /// `CampfireBlock.makeParticles` (always visible, overriding the limiter);

crates/horizon-client/src/arrows.rs

@@ -9,7 +9,7 @@ use crate::{
     collisions::SceneCollisions,
     mobs::Who,
     motion::{FluidResources, LAVA, WATER},
-    projectiles::{Hit, Projectile},
+    projectiles::{Hit, Projectile, ProjectileKind},
     world::World,
 };
 use horizon_core::{
@@ -132,6 +132,10 @@ pub enum ArrowSound {
     HitGround,
     /// `entity.generic.extinguish_fire`.
     Extinguish,
+    /// A thrown trident's `getDefaultHitGroundSoundEvent` (`item.trident.hit_ground`).
+    TridentHitGround,
+    /// `ThrownTrident.onHitEntity`'s `item.trident.hit`.
+    TridentHit,
 }
 /// What a burning arrow does to the block it hits (`onProjectileHit`).
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -169,6 +173,9 @@ pub struct ArrowState {
     pub was_eye_in_water: bool,
     pub first_tick: bool,
     pub has_been_shot: bool,
+    /// `ThrownTrident.dealtDamage`: it has hit an entity (or sat in a block
+    /// for over 4 ticks) and hits no more.
+    pub dealt_damage: bool,
     pub removed: bool,
     /// The arrow's own random (`Entity.random`).
     pub random: LegacyRandom,
@@ -211,6 +218,7 @@ impl ArrowState {
             was_eye_in_water: false,
             first_tick: true,
             has_been_shot: false,
+            dealt_damage: false,
             removed: false,
             random,
             events: Vec::new(),
@@ -451,12 +459,14 @@ pub fn finish_entity_hit(p: &mut Projectile, scene: &ArrowScene, outcome: Entity
     let Some(mut st) = p.arrow.take() else {
         return false;
     };
+    let trident = matches!(p.kind, ProjectileKind::Trident);
     let mut ticker = Ticker {
         p,
         st: &mut st,
         scene,
     };
     match outcome {
+        EntityHit::Hurt | EntityHit::Refused if trident => ticker.trident_bounce(),
         EntityHit::Hurt => {
             ticker.hit_sound();
             // A piercing arrow flies on (`getPierceLevel() <= 0` discards).
@@ -501,7 +511,16 @@ impl Ticker<'_, '_, '_, '_> {
                 p.z,
             ))
     }
+    /// Whether this is a `ThrownTrident` (`AbstractArrow` with its own water
+    /// inertia, sounds and hit).
+    fn trident(&self) -> bool {
+        matches!(self.p.kind, ProjectileKind::Trident)
+    }
     fn tick(&mut self, targets: &[(Who, Aabb)]) -> Hit {
+        // ThrownTrident.tick.
+        if self.trident() && self.st.in_ground_time > 4 {
+            self.st.dealt_damage = true;
+        }
         let physics = !self.st.no_physics;
         let movement = self.p.velocity;
         let block_pos = self.block_position();
@@ -549,8 +568,9 @@ impl Ticker<'_, '_, '_, '_> {
         self.st.in_ground_time = 0;
         let original = self.position();
         if self.st.was_touching_water {
-            // getWaterInertia, then the bubbles behind it.
-            self.p.velocity = self.p.velocity.scale(f64::from(0.6f32));
+            // getWaterInertia (0.99 for a trident), then the bubbles behind it.
+            let inertia = if self.trident() { 0.99f32 } else { 0.6f32 };
+            self.p.velocity = self.p.velocity.scale(f64::from(inertia));
             let v = self.p.velocity;
             for _ in 0..4 {
                 self.st.events.push(ArrowEvent::Particle {
@@ -687,6 +707,8 @@ impl Ticker<'_, '_, '_, '_> {
             .expand_towards(self.p.velocity)
             .inflate(Vec3::new(1.0, 1.0, 1.0));
         let mut best: Option<(Who, Vec3, f64)> = None;
+        // ThrownTrident.findHitEntity: none once it has dealt damage.
+        let targets = if self.st.dealt_damage { &[] } else { targets };
         for (who, b) in targets {
             if Some(*who) == self.p.owner && !self.p.left_owner || !b.intersects(area) {
                 continue;
@@ -757,12 +779,33 @@ impl Ticker<'_, '_, '_, '_> {
     /// `playSound(soundEvent, 1, 1.2 / (random * 0.2 + 0.9))`.
     fn hit_sound(&mut self) {
         let pitch = 1.2 / (self.st.random.next_float() * 0.2 + 0.9);
+        let sound = if self.trident() {
+            ArrowSound::TridentHitGround
+        } else {
+            ArrowSound::HitGround
+        };
         self.st.events.push(ArrowEvent::Sound {
-            sound: ArrowSound::HitGround,
+            sound,
             volume: 1.0,
             pitch,
         });
     }
+    /// `ThrownTrident.onHitEntity` after the hurt, whether it landed or not:
+    /// the hit sound, then `deflect(REVERSE, ..., (0.02, 0.2, 0.02))`. The
+    /// trident keeps flying (it has dealt its damage) and falls.
+    fn trident_bounce(&mut self) {
+        self.st.dealt_damage = true;
+        self.st.events.push(ArrowEvent::Sound {
+            sound: ArrowSound::TridentHit,
+            volume: 1.0,
+            pitch: 1.0,
+        });
+        // ProjectileDeflection.REVERSE.
+        let rotation = 170.0 + self.st.random.next_float() * 20.0;
+        let v = self.p.velocity;
+        self.p.velocity = Vec3::new(v.x * (-0.02 * 0.5), v.y * (-0.2 * 0.5), v.z * (-0.02 * 0.5));
+        self.p.yaw += rotation;
+    }
     /// `onHitEntity` when the entity took no damage: `deflect(REVERSE, 0.2)`,
     /// a half turn give or take ten degrees at a tenth of the speed; one
     /// left almost still drops its pickup (ALLOWED) and is discarded.

crates/horizon-client/src/audio.rs

@@ -719,11 +719,6 @@ impl Audio {
         self.play(event, at, volume, pitch);
         self.capture = capture;
     }
-    /// `LivingEntity.handleDamageEvent`'s pitch, `(r - r) * 0.2 + 1`, drawn on the
-    /// client (the entity's own random there, never the server's world random).
-    pub fn hurt_pitch(&mut self) -> f32 {
-        (self.random.next_float() - self.random.next_float()) * 0.2 + 1.0
-    }
     /// `AbstractWidget.playButtonClickSound`: an unseeded, relative UI sound.
     pub fn play_button_click(&mut self) {
         self.play_instance(

crates/horizon-client/src/benchmark.rs

@@ -450,6 +450,54 @@ mod tests {
         assert_eq!(view_chunks(32), 2573);
         assert_eq!(view_chunks(0), 0);
     }
+    /// The status a fake control answers with: the player is where it should
+    /// be, nothing is queued, and the world holds `chunks` resident chunks.
+    fn status(chunks: u64) -> String {
+        serde_json::json!({
+            "player": {"position": [0.0, 64.0, 0.0]},
+            "pending_chunks": 0,
+            "screen": "playing",
+            "render_distance": 12,
+            "chunks": chunks,
+            "generated_chunks": chunks,
+            "meshed_sections": 0,
+            "streaming": {},
+        })
+        .to_string()
+    }
+
+    #[test]
+    fn the_load_waits_for_the_chunks_a_teleport_starts() {
+        // Right after a teleport the game reports steady counts and nothing
+        // queued for over a second, before the integrated server has sent the
+        // first chunk: the quiet rule alone would call that loaded, and the
+        // scene would be measured over an empty view (#1749).
+        const LATE: usize = 30;
+        let (tx, rx) = mpsc::channel::<Request>();
+        let polls = std::sync::Arc::new(std::sync::atomic::AtomicUsize::new(0));
+        let counted = std::sync::Arc::clone(&polls);
+        let server = thread::spawn(move || {
+            let mut seen = 0;
+            while let Ok(request) = rx.recv() {
+                if request.line == "status" {
+                    let chunks = if seen < LATE { 0 } else { 400 };
+                    seen += 1;
+                    counted.store(seen, std::sync::atomic::Ordering::SeqCst);
+                    let _ = request.reply.send(status(chunks));
+                } else {
+                    let _ = request.reply.send("{}".to_owned());
+                }
+            }
+        });
+        let control = Control(tx);
+        wait_loaded(&control, |_| true).expect("the scene loads");
+        assert!(
+            polls.load(std::sync::atomic::Ordering::SeqCst) > LATE,
+            "the load finished before the chunks arrived"
+        );
+        drop(control);
+        let _ = server.join();
+    }
 
     #[test]
     fn yaw_matches_vanilla() {

crates/horizon-client/src/bidi.rs

@@ -0,0 +1,302 @@
+//! Right-to-left text (`FormattedBidiReorder.reorder`, behind
+//! `Language.getVisualOrder`): the logical text a player types becomes the
+//! glyphs a font draws left to right. Arabic letters are shaped into their
+//! joined presentation forms (ICU's `ArabicShaping` with `LETTERS_SHAPE`), the
+//! text is reordered by the Unicode bidirectional algorithm, and characters in
+//! right-to-left runs are mirrored. Left-to-right text comes back unchanged.
+use crate::text::{Span, Text};
+use std::borrow::Cow;
+use unicode_bidi::{
+    BidiClass, Direction, Level, ParagraphBidiInfo, bidi_class, get_base_direction,
+};
+
+/// How a letter joins its neighbours, as ICU's shaper sees it: `Right` joins
+/// the letter before it only, `Dual` both neighbours, `Mark` is skipped over
+/// (diacritics) and `None` never joins.
+#[derive(Clone, Copy, PartialEq)]
+enum Join {
+    None,
+    Right,
+    Dual,
+    Mark,
+}
+use Join::{Dual, Mark, Right};
+
+/// ICU's joining table (`araLink`): code point ranges and their class, with the
+/// lam-alef ligatures at the end. Anything else is `Join::None`.
+const JOINS: &[(u32, u32, Join)] = &[
+    (0x0622, 0x0625, Right),
+    (0x0626, 0x0626, Dual),
+    (0x0627, 0x0627, Right),
+    (0x0628, 0x0628, Dual),
+    (0x0629, 0x0629, Right),
+    (0x062A, 0x062E, Dual),
+    (0x062F, 0x0632, Right),
+    (0x0633, 0x063A, Dual),
+    (0x0640, 0x0647, Dual),
+    (0x0648, 0x0649, Right),
+    (0x064A, 0x064A, Dual),
+    (0x064B, 0x0656, Mark),
+    (0x0670, 0x0670, Mark),
+    (0x0671, 0x0673, Right),
+    (0x0675, 0x0677, Right),
+    (0x0678, 0x0687, Dual),
+    (0x0688, 0x0699, Right),
+    (0x069A, 0x06B9, Dual),
+    (0x06BA, 0x06BA, Right),
+    (0x06BB, 0x06BF, Dual),
+    (0x06C0, 0x06C0, Right),
+    (0x06C1, 0x06C1, Dual),
+    (0x06C2, 0x06CB, Right),
+    (0x06CC, 0x06CC, Dual),
+    (0x06CD, 0x06CD, Right),
+    (0x06CE, 0x06D1, Dual),
+    (0x06D2, 0x06D3, Right),
+    (0x200D, 0x200D, Dual),
+    (0x206D, 0x206F, Mark),
+    (0xFEF5, 0xFEFC, Right),
+];
+
+/// Letters that have joined forms and the code point of the isolated one; the
+/// final, initial and medial forms follow it (a right-joining letter has the
+/// isolated and final only). The lam-alef ligatures are their own letters.
+/// ICU leaves the extended letters (پ چ ژ ک گ ی and the rest of U+0679 to
+/// U+06D3) unchanged, so they are in `JOINS` but not here.
+#[rustfmt::skip]
+const FORMS: &[(u32, u32)] = &[
+    (0x0622, 0xFE81), (0x0623, 0xFE83), (0x0624, 0xFE85), (0x0625, 0xFE87), (0x0626, 0xFE89),
+    (0x0627, 0xFE8D), (0x0628, 0xFE8F), (0x0629, 0xFE93), (0x062A, 0xFE95), (0x062B, 0xFE99),
+    (0x062C, 0xFE9D), (0x062D, 0xFEA1), (0x062E, 0xFEA5), (0x062F, 0xFEA9), (0x0630, 0xFEAB),
+    (0x0631, 0xFEAD), (0x0632, 0xFEAF), (0x0633, 0xFEB1), (0x0634, 0xFEB5), (0x0635, 0xFEB9),
+    (0x0636, 0xFEBD), (0x0637, 0xFEC1), (0x0638, 0xFEC5), (0x0639, 0xFEC9), (0x063A, 0xFECD),
+    (0x0641, 0xFED1), (0x0642, 0xFED5), (0x0643, 0xFED9), (0x0644, 0xFEDD), (0x0645, 0xFEE1),
+    (0x0646, 0xFEE5), (0x0647, 0xFEE9), (0x0648, 0xFEED), (0x0649, 0xFEEF), (0x064A, 0xFEF1),
+    (0xFEF5, 0xFEF5), (0xFEF7, 0xFEF7), (0xFEF9, 0xFEF9), (0xFEFB, 0xFEFB),
+];
+
+/// `Bidi_Mirroring_Glyph` (`UCharacter.getMirror`): each pair is two
+/// neighbouring characters that mirror each other.
+const MIRRORED: &str = "\
+        ()<>[]{}«»༺༻༼༽᚛᚜‹›⁅⁆⁽⁾₍₎∈∋∉∌∊∍∕⧵∟⯾∠⦣∡⦛∢⦠∤⫮∼∽≃⋍≅≌≒≓\
+        ≔≕≤≥≦≧≨≩≪≫≮≯≰≱≲≳≴≵≶≷≸≹≺≻≼≽≾≿⊀⊁⊂⊃⊄⊅⊆⊇⊈⊉⊊⊋⊏⊐⊑⊒⊘⦸⊢⊣⊦⫞\
+        ⊨⫤⊩⫣⊫⫥⊰⊱⊲⊳⊴⊵⊶⊷⊸⟜⋉⋊⋋⋌⋐⋑⋖⋗⋘⋙⋚⋛⋜⋝⋞⋟⋠⋡⋢⋣⋤⋥⋦⋧⋨⋩⋪⋫⋬⋭⋰⋱⋲⋺\
+        ⋳⋻⋴⋼⋶⋽⋷⋾⌈⌉⌊⌋〈〉❨❩❪❫❬❭❮❯❰❱❲❳❴❵⟃⟄⟅⟆⟈⟉⟋⟍⟕⟖⟝⟞⟢⟣⟤⟥⟦⟧⟨⟩⟪⟫\
+        ⟬⟭⟮⟯⦃⦄⦅⦆⦇⦈⦉⦊⦋⦌⦍⦐⦎⦏⦑⦒⦓⦔⦕⦖⦗⦘⦤⦥⦨⦩⦪⦫⦬⦭⦮⦯⧀⧁⧄⧅⧏⧐⧑⧒⧔⧕⧘⧙⧚⧛\
+        ⧨⧩⧸⧹⧼⧽⨫⨬⨭⨮⨴⨵⨼⨽⩤⩥⩹⩺⩻⩼⩽⩾⩿⪀⪁⪂⪃⪄⪅⪆⪇⪈⪉⪊⪋⪌⪍⪎⪏⪐⪑⪒⪓⪔⪕⪖⪗⪘⪙⪚\
+        ⪛⪜⪝⪞⪟⪠⪡⪢⪦⪧⪨⪩⪪⪫⪬⪭⪯⪰⪱⪲⪳⪴⪵⪶⪷⪸⪹⪺⪻⪼⪽⪾⪿⫀⫁⫂⫃⫄⫅⫆⫇⫈⫉⫊⫋⫌⫍⫎⫏⫐\
+        ⫑⫒⫓⫔⫕⫖⫬⫭⫷⫸⫹⫺⸂⸃⸄⸅⸉⸊⸌⸍⸜⸝⸠⸡⸢⸣⸤⸥⸦⸧⸨⸩⹕⹖⹗⹘⹙⹚⹛⹜〈〉《》「」『』【】\
+        〔〕〖〗〘〙〚〛﹙﹚﹛﹜﹝﹞﹤﹥（）＜＞［］｛｝｟｠｢｣";
+
+fn join(c: char) -> Join {
+    let c = c as u32;
+    JOINS
+        .iter()
+        .find(|&&(from, to, _)| (from..=to).contains(&c))
+        .map_or(Join::None, |&(_, _, join)| join)
+}
+
+/// The letter whose joined form `c` is (ICU shapes the forms again), or `c`.
+fn letter_of(c: char) -> char {
+    let c32 = c as u32;
+    if !matches!(c32, 0xFE70..=0xFEFC) {
+        return c;
+    }
+    if (0xFE70..0xFE80).contains(&c32) {
+        // The diacritics' forms pair up from fathatan on.
+        return char::from_u32(0x064B + (c32 - 0xFE70) / 2).unwrap_or(c);
+    }
+    FORMS
+        .iter()
+        .find(|&&(letter, iso)| {
+            let forms = if join(char::from_u32(letter).unwrap_or(c)) == Dual {
+                4
+            } else {
+                2
+            };
+            (iso..iso + forms).contains(&c32)
+        })
+        .and_then(|&(letter, _)| char::from_u32(letter))
+        .unwrap_or(c)
+}
+
+/// `ArabicShaping(LETTERS_SHAPE).shape`: lam followed by an alef (diacritics
+/// may sit between) becomes one ligature, then every letter takes the isolated,
+/// final, initial or medial form its neighbours call for. Diacritics take the
+/// tatweel form between two joined letters. The text can only get shorter.
+fn shape(text: &[char]) -> Vec<char> {
+    let letters: Vec<char> = text.iter().map(|&c| letter_of(c)).collect();
+    let mut chars = Vec::with_capacity(letters.len());
+    let mut i = 0;
+    while i < letters.len() {
+        if letters[i] == '\u{644}' {
+            let mut at = i + 1;
+            while letters.get(at).is_some_and(|&c| join(c) == Mark) {
+                at += 1;
+            }
+            let alef = letters.get(at).and_then(|&c| {
+                ['\u{622}', '\u{623}', '\u{625}', '\u{627}']
+                    .iter()
+                    .position(|&a| a == c)
+            });
+            if let Some(alef) = alef {
+                chars.push(char::from_u32(0xFEF5 + 2 * alef as u32).unwrap_or('\u{644}'));
+                chars.extend_from_slice(&letters[i + 1..at]);
+                i = at + 1;
+                continue;
+            }
+        }
+        chars.push(letters[i]);
+        i += 1;
+    }
+    // Whether the nearest letter before joins the next one, and the joins of
+    // the nearest letter after.
+    let mut joins_next = false;
+    let mut out = Vec::with_capacity(chars.len());
+    for (i, &c) in chars.iter().enumerate() {
+        let next_joins = chars[i + 1..]
+            .iter()
+            .map(|&n| join(n))
+            .find(|&j| j != Mark)
+            .is_some_and(|j| j != Join::None);
+        let kind = join(c);
+        let shaped = match kind {
+            Join::None => {
+                joins_next = false;
+                c
+            }
+            Mark => match c as u32 {
+                m @ 0x064B..=0x0652 => {
+                    let iso = 0xFE70 + 2 * (m - 0x064B);
+                    let tatweel = joins_next && next_joins && !matches!(m, 0x064C | 0x064D);
+                    char::from_u32(iso + u32::from(tatweel)).unwrap_or(c)
+                }
+                _ => c,
+            },
+            Right | Dual => {
+                let to_next = kind == Dual && next_joins;
+                let form = match (joins_next, to_next) {
+                    (false, false) => 0,
+                    (true, false) => 1,
+                    (false, true) => 2,
+                    (true, true) => 3,
+                };
+                joins_next = kind == Dual;
+                FORMS
+                    .binary_search_by_key(&(c as u32), |&(letter, _)| letter)
+                    .ok()
+                    .and_then(|at| char::from_u32(FORMS[at].1 + form))
+                    .unwrap_or(c)
+            }
+        };
+        out.push(shaped);
+    }
+    out
+}
+
+/// `UCharacter.getMirror`.
+fn mirror(c: char) -> char {
+    if bidi_class(c) != BidiClass::ON {
+        return c;
+    }
+    let mut pairs = MIRRORED.chars();
+    while let (Some(a), Some(b)) = (pairs.next(), pairs.next()) {
+        if c == a {
+            return b;
+        }
+        if c == b {
+            return a;
+        }
+    }
+    c
+}
+
+/// Whether a character can change anything: right-to-left letters and numbers,
+/// the explicit direction controls and the diacritics that shaping turns into
+/// letters. Without any, left-to-right text keeps its order.
+fn directional(c: char) -> bool {
+    c as u32 >= 0x0590
+        && (matches!(c as u32, 0x064B..=0x0652)
+            || matches!(
+                bidi_class(c),
+                BidiClass::R
+                    | BidiClass::AL
+                    | BidiClass::AN
+                    | BidiClass::LRE
+                    | BidiClass::RLE
+                    | BidiClass::LRO
+                    | BidiClass::RLO
+                    | BidiClass::PDF
+                    | BidiClass::LRI
+                    | BidiClass::RLI
+                    | BidiClass::FSI
+                    | BidiClass::PDI
+            ))
+}
+
+/// Whether `chars` keep their order and shapes: left-to-right text without
+/// anything directional, in a language that reads left to right by default.
+fn unchanged(mut chars: impl Iterator<Item = char>, default_rtl: bool) -> bool {
+    !default_rtl && !chars.any(directional)
+}
+
+/// `FormattedBidiReorder.reorder`: `chars` shaped, in visual order, with each
+/// character's position in the shaped text. A character's style is the one at
+/// its position in the shaped text, as `SubStringSource` takes it (the text
+/// shrinks at a lam-alef ligature).
+fn reorder(chars: &[char], default_rtl: bool) -> Vec<(char, usize)> {
+    let shaped = shape(chars);
+    let plain: String = shaped.iter().collect();
+    // DEFAULT_RTL only changes text without a strong character.
+    let level =
+        (default_rtl && get_base_direction(plain.as_str()) == Direction::Mixed).then(Level::rtl);
+    let info = ParagraphBidiInfo::new(&plain, level);
+    let levels = info.reordered_levels_per_char(0..plain.len());
+    ParagraphBidiInfo::reorder_visual(&levels)
+        .into_iter()
+        .map(|i| {
+            let c = if levels[i].is_rtl() {
+                mirror(shaped[i])
+            } else {
+                shaped[i]
+            };
+            (c, i)
+        })
+        .collect()
+}
+
+/// `Language.getVisualOrder` of a text (its `§` codes already resolved), for
+/// the current language's direction.
+pub fn visual(text: &Text) -> Cow<'_, Text> {
+    let default_rtl = crate::lang::bidirectional();
+    if unchanged(text.chars().map(|(c, _)| c), default_rtl) {
+        return Cow::Borrowed(text);
+    }
+    let chars: Vec<char> = text.chars().map(|(c, _)| c).collect();
+    let styles: Vec<_> = text.chars().map(|(_, style)| style).collect();
+    let mut out = Text::default();
+    for (c, at) in reorder(&chars, default_rtl) {
+        match out.spans.last_mut() {
+            Some(span) if span.style == *styles[at] => span.text.push(c),
+            _ => out.spans.push(Span {
+                text: c.to_string(),
+                style: styles[at].clone(),
+            }),
+        }
+    }
+    Cow::Owned(out)
+}
+
+/// The same for a plain string.
+pub fn visual_str(s: &str) -> Cow<'_, str> {
+    let default_rtl = crate::lang::bidirectional();
+    if unchanged(s.chars(), default_rtl) {
+        return Cow::Borrowed(s);
+    }
+    let chars: Vec<char> = s.chars().collect();
+    Cow::Owned(
+        reorder(&chars, default_rtl)
+            .into_iter()
+            .map(|(c, _)| c)
+            .collect(),
+    )
+}

crates/horizon-client/src/biome.rs

@@ -1,7 +1,7 @@
 //! Biome colours from the pinned biome definitions and colormaps
 //! (`Biome.getGrassColor`/`getFoliageColor`/..., `BlockTintSources`).
 use crate::Result;
-use horizon_core::{noise::SimplexNoise, random::LegacyRandom};
+use horizon_core::{noise::SimplexNoise, position::BlockPos, random::LegacyRandom};
 use serde_json::Value;
 use std::{collections::HashMap, fs, path::Path};
 
@@ -33,6 +33,8 @@ pub struct BiomeInfo {
     pub increased_fire_burnout: bool,
     pub name: String,
     pub temperature: f32,
+    /// `temperature_modifier: frozen` (the frozen oceans).
+    pub frozen: bool,
     pub downfall: f32,
     pub precipitation: bool,
     pub grass: u32,
@@ -45,6 +47,26 @@ pub struct BiomeInfo {
     pub fog: Option<u32>,
     pub water_fog: u32,
 }
+impl BiomeInfo {
+    /// `Biome.getHeightAdjustedTemperature`: the frozen modifier, then cooler
+    /// with height above `sea_level + 17`.
+    pub fn temperature_at(&self, pos: BlockPos, sea_level: i32) -> f32 {
+        use horizon_world::worldgen::biome_temperature::{
+            BiomeTemperatureSettings, TemperatureModifier,
+        };
+        BiomeTemperatureSettings {
+            base_temperature: self.temperature,
+            modifier: if self.frozen {
+                TemperatureModifier::Frozen
+            } else {
+                TemperatureModifier::None
+            },
+            has_precipitation: self.precipitation,
+            downfall: self.downfall,
+        }
+        .height_adjusted(pos, sea_level)
+    }
+}
 pub struct Biomes {
     pub list: Vec<BiomeInfo>,
     pub index: HashMap<String, u16>,
@@ -135,6 +157,7 @@ impl Biomes {
                     .as_bool()
                     .unwrap_or(false),
                 temperature,
+                frozen: v["temperature_modifier"].as_str() == Some("frozen"),
                 downfall,
                 precipitation: v["has_precipitation"].as_bool().unwrap_or(true),
                 grass: color(&effects["grass_color"])

crates/horizon-client/src/block_entity_render.rs

@@ -610,7 +610,9 @@ fn sign_text_calls(
         .iter()
         .enumerate()
         .map(|(i, line)| {
+            // The line that fits, in the order it is drawn (getVisualOrder).
             let shown = first_line(line, data.max_line_width(), &advance);
+            let shown = crate::bidi::visual_str(&shown).into_owned();
             TextCall {
                 matrix: m,
                 x: -((width(&shown) as i32) / 2) as f32,

crates/horizon-client/src/blocks.rs

@@ -90,7 +90,7 @@ pub const MAP_COLORS: [u32; 62] = [
     14200723, 8365974,
 ];
 /// The 12 edges of the unit cube (outline data predating the export).
-fn cube_edges() -> Vec<[f64; 6]> {
+pub fn cube_edges() -> Vec<[f64; 6]> {
     let mut edges = Vec::new();
     for a in 0..3 {
         for (u, v) in [(0., 0.), (1., 0.), (0., 1.), (1., 1.)] {

crates/horizon-client/src/brewing.rs

@@ -7,7 +7,12 @@ use crate::{
     items::{ItemStack, Items},
 };
 use serde_json::Value;
-use std::{collections::HashSet, fs, path::Path, sync::Arc};
+use std::{
+    collections::{HashMap, HashSet},
+    fs,
+    path::Path,
+    sync::{Arc, OnceLock},
+};
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum Category {
@@ -94,6 +99,24 @@ pub fn effect(id: &str) -> Option<&'static EffectDef> {
     let id = id.trim_start_matches("minecraft:");
     EFFECTS.iter().find(|e| e.id == id)
 }
+/// Namespaced effect ids for mob effect storage.
+pub fn namespaced(id: &'static str) -> &'static str {
+    static IDS: OnceLock<HashMap<&'static str, &'static str>> = OnceLock::new();
+    IDS.get_or_init(|| {
+        EFFECTS
+            .iter()
+            .map(|e| {
+                (
+                    e.id,
+                    &*Box::leak(format!("minecraft:{}", e.id).into_boxed_str()),
+                )
+            })
+            .collect()
+    })
+    .get(id)
+    .copied()
+    .unwrap_or(id)
+}
 /// A `Potion`: id, name suffix (`item.minecraft.potion.effect.<name>`) and
 /// effects as (effect, duration ticks, amplifier).
 #[derive(Clone, Copy, Debug)]

crates/horizon-client/src/bundle.rs

@@ -1,6 +1,7 @@
 //! `BundleContents.Mutable`: what a bundle takes in and gives back, by
 //! weight. The menus (`menu`, `lan::menu`) run `BundleItem`'s click
 //! overrides on it.
+use crate::item_data::BundleSelected;
 use crate::items::{ItemStack, Items};
 use horizon_world::nbt::Tag;
 
@@ -97,6 +98,8 @@ pub fn can_be_in_bundle(stack: &ItemStack) -> bool {
 pub struct Contents {
     items: Vec<ItemStack>,
     weight: Weight,
+    /// `selectedItem`: an index into `items`, -1 for none.
+    selected: i32,
 }
 
 impl Contents {
@@ -104,9 +107,11 @@ impl Contents {
     pub fn of(items: &Items, stack: &ItemStack) -> Option<Self> {
         let inside = contents_of(items, stack)?.to_vec();
         let weight = contents_weight(items, &inside);
+        let selected = stack.data().map_or(-1, |d| d.bundle_selected.0);
         Some(Self {
             items: inside,
             weight,
+            selected,
         })
     }
 
@@ -154,18 +159,26 @@ impl Contents {
         amount
     }
 
-    /// `removeOne`: the first stack (Horizon keeps no selected item).
+    /// `removeOne`: the selected stack, else the first; nothing is selected after.
     pub fn remove_one(&mut self, items: &Items) -> Option<ItemStack> {
         if self.items.is_empty() {
             return None;
         }
-        let stack = self.items.remove(0);
+        let at =
+            usize::try_from(self.selected).map_or(0, |i| if i < self.items.len() { i } else { 0 });
+        let stack = self.items.remove(at);
         self.weight = self
             .weight
             .sub(item_weight(items, &stack).times(stack.count));
+        self.selected = -1;
         Some(stack)
     }
 
+    /// `getSelectedItemIndex`.
+    pub fn selected(&self) -> i32 {
+        self.selected
+    }
+
     /// The stacks inside, in display order (the first is the next out).
     pub fn items(&self) -> &[ItemStack] {
         &self.items
@@ -200,11 +213,28 @@ impl Contents {
 
     /// `toImmutable`, written back into the bundle's component.
     pub fn store(self, bundle: &mut ItemStack) {
-        bundle.data_mut().bundle_contents = self.items;
+        let data = bundle.data_mut();
+        data.bundle_contents = self.items;
+        data.bundle_selected = BundleSelected(self.selected);
         bundle.tidy();
     }
 }
 
+/// `BundleItem.toggleSelectedItem`: select `index`, or nothing when it is the
+/// selected one already or outside the contents.
+pub fn toggle_selected(bundle: &mut ItemStack, index: i32) {
+    let Some(data) = bundle.extra.as_deref_mut() else {
+        return;
+    };
+    let inside = (0..data.bundle_contents.len() as i32).contains(&index);
+    let selected = if data.bundle_selected.0 != index && inside {
+        index
+    } else {
+        -1
+    };
+    data.bundle_selected = BundleSelected(selected);
+}
+
 #[cfg(test)]
 mod tests {
     use super::Weight;
@@ -232,8 +262,10 @@ pub struct TooltipLayout {
     /// The component's own width (96) and height, the text's excluded.
     pub width: f32,
     pub height: f32,
-    /// Each slot's top-left and the stack in it, in reading order.
+    /// Each slot's top-left and the stack in it, in drawing order.
     pub slots: Vec<([f32; 2], ItemStack)>,
+    /// The position in `slots` of the selected item, which is drawn highlighted.
+    pub selected: Option<usize>,
     /// The `+N` of the items past the grid: its top-left and the count.
     pub overflow: Option<([f32; 2], u32)>,
     /// The progress bar's top-left, its fill's width out of 94, and whether
@@ -266,6 +298,7 @@ pub fn tooltip_layout(
             width: 96.0,
             height: description_height + 13.0 + 8.0,
             slots: Vec::new(),
+            selected: None,
             overflow: None,
             bar: [x + offset, y + description_height + 4.0],
             fill: 0.0,
@@ -282,6 +315,7 @@ pub fn tooltip_layout(
     let x_start = x + offset + 96.0;
     let y_start = y + grid_height;
     let mut slots = Vec::with_capacity(shown.len());
+    let mut selected = None;
     let mut overflow = None;
     // Rows fill bottom-up and columns right-to-left, as vanilla draws them.
     let mut slot = 0;
@@ -290,8 +324,13 @@ pub fn tooltip_layout(
             let at = [x_start - column as f32 * 24.0, y_start - row as f32 * 24.0];
             if hidden > 0 && row == 1 && column == 1 {
                 overflow = Some((at, hidden));
-            } else if let Some(stack) = shown.get(slot) {
-                slots.push((at, stack.clone()));
+            } else if slot < shown.len() {
+                // `extractSlot`: the cell of slot number n holds item `size - n`.
+                let index = shown.len() - 1 - slot;
+                if usize::try_from(contents.selected()) == Ok(index) {
+                    selected = Some(slots.len());
+                }
+                slots.push((at, shown[index].clone()));
                 slot += 1;
             }
         }
@@ -301,6 +340,7 @@ pub fn tooltip_layout(
         width: 96.0,
         height: grid_height + 13.0 + 8.0,
         slots,
+        selected,
         overflow,
         bar: [x + offset, y + grid_height + 4.0],
         // `Mth.mulAndTruncate(weight, 94)`, kept within the bar.
@@ -349,8 +389,8 @@ mod tooltip_tests {
         assert_eq!(layout.slots.len(), 12);
         assert_eq!(layout.overflow, None);
         assert_eq!(layout.height, 3.0 * 24.0 + 13.0 + 8.0);
-        // Rows fill bottom-up and columns right-to-left: the first item is in
-        // the bottom-right cell, the twelfth in the top-left.
+        // Rows fill bottom-up and columns right-to-left: the twelfth item is in
+        // the bottom-right cell, the first in the top-left.
         assert_eq!(layout.slots[0].0, [96.0 - 24.0, 3.0 * 24.0 - 24.0]);
         assert_eq!(&*layout.slots[0].1.item, "minecraft:stone");
         assert_eq!(layout.slots[11].0, [0.0, 0.0]);

crates/horizon-client/src/cauldron.rs

@@ -40,6 +40,8 @@ pub struct Interaction {
     /// The cauldron's new state.
     pub block: Option<BlockState>,
     pub sound: Option<&'static str>,
+    /// The custom statistic the player earns (`use_cauldron`, ...).
+    pub stat: Option<&'static str>,
 }
 
 fn state(name: &str, level: Option<u8>) -> BlockState {
@@ -57,6 +59,7 @@ fn pass() -> Interaction {
         outcome: Outcome::Pass,
         block: None,
         sound: None,
+        stat: None,
     }
 }
 
@@ -117,11 +120,12 @@ fn lowered(cauldron: &BlockState) -> BlockState {
     }
 }
 
-fn changed(block: BlockState, sound: Option<&'static str>) -> Interaction {
+fn changed(block: BlockState, sound: Option<&'static str>, stat: &'static str) -> Interaction {
     Interaction {
         outcome: Outcome::Success,
         block: Some(block),
         sound,
+        stat: Some(stat),
     }
 }
 
@@ -179,18 +183,22 @@ pub fn interact(
             stack.data_mut().dyed_color = None;
             stack.tidy();
         }
-        return changed(lowered(cauldron), None);
+        return changed(lowered(cauldron), None, "clean_armor");
     }
     let fill_bucket = |player: &mut dyn Player, new: &str, can_fill: bool, sound| {
         if !can_fill {
             return pass();
         }
         filled(player, ItemStack::new(new, 1), true);
-        changed(state("minecraft:cauldron", None), Some(sound))
+        changed(
+            state("minecraft:cauldron", None),
+            Some(sound),
+            "use_cauldron",
+        )
     };
     let empty_bucket = |player: &mut dyn Player, block: BlockState, sound| {
         filled(player, ItemStack::new("minecraft:bucket", 1), true);
-        changed(block, Some(sound))
+        changed(block, Some(sound), "fill_cauldron")
     };
     match item {
         "minecraft:lava_bucket" => {
@@ -199,6 +207,7 @@ pub fn interact(
                     outcome: Outcome::Consume,
                     block: None,
                     sound: None,
+                    stat: None,
                 }
             } else {
                 empty_bucket(
@@ -221,6 +230,7 @@ pub fn interact(
                     outcome: Outcome::Consume,
                     block: None,
                     sound: None,
+                    stat: None,
                 }
             } else {
                 empty_bucket(
@@ -241,6 +251,7 @@ pub fn interact(
             changed(
                 state("minecraft:water_cauldron", Some(1)),
                 Some("minecraft:item.bottle.empty"),
+                "use_cauldron",
             )
         }
         ("water", "minecraft:bucket") => fill_bucket(
@@ -255,7 +266,11 @@ pub fn interact(
                 ItemStack::new("minecraft:potion", 1).with_potion("minecraft:water"),
                 true,
             );
-            changed(lowered(cauldron), Some("minecraft:item.bottle.fill"))
+            changed(
+                lowered(cauldron),
+                Some("minecraft:item.bottle.fill"),
+                "use_cauldron",
+            )
         }
         ("water", "minecraft:potion") => {
             if level == 3 || !water_potion {
@@ -266,7 +281,7 @@ pub fn interact(
             // BlockState.cycle on a 1..=3 property
             next.properties
                 .insert("level".into(), (level % 3 + 1).to_string());
-            changed(next, Some("minecraft:item.bottle.empty"))
+            changed(next, Some("minecraft:item.bottle.empty"), "use_cauldron")
         }
         ("water", name)
             if name
@@ -283,7 +298,7 @@ pub fn interact(
             cleaned.data_mut().banner_patterns.pop();
             cleaned.tidy();
             filled(player, cleaned, false);
-            changed(lowered(cauldron), None)
+            changed(lowered(cauldron), None, "clean_banner")
         }
         ("water", name)
             if name
@@ -292,7 +307,7 @@ pub fn interact(
                 .is_some_and(|c| COLORS.contains(&c)) =>
         {
             filled(player, held.transmute("minecraft:shulker_box", 1), false);
-            changed(lowered(cauldron), None)
+            changed(lowered(cauldron), None, "clean_shulker_box")
         }
         ("lava", "minecraft:bucket") => fill_bucket(
             player,

crates/horizon-client/src/chunk_map.rs

@@ -76,14 +76,11 @@ impl<'a> IntoIterator for &'a ChunkMap {
     }
 }
 impl crate::light::LightWorld for ChunkMap {
-    fn state(&self, x: i32, y: i32, z: i32) -> Option<u32> {
-        self.columns.state(x, y, z)
+    fn section(&self, cx: i32, s: usize, cz: i32) -> Option<&Arc<crate::chunk::Section>> {
+        self.columns.section(cx, s, cz)
     }
-    fn light(&self, x: i32, y: i32, z: i32) -> Option<u8> {
-        self.columns.light(x, y, z)
-    }
-    fn set_light(&mut self, x: i32, y: i32, z: i32, packed: u8) {
-        self.columns.set_light(x, y, z, packed);
+    fn set_section_light(&mut self, cx: i32, s: usize, cz: i32, light: crate::chunk::Light) {
+        self.columns.set_section_light(cx, s, cz, light);
     }
 }
 
@@ -106,7 +103,13 @@ mod tests {
         for column in map.values_mut() {
             Arc::make_mut(column).light_loaded = true;
         }
-        crate::light::LightWorld::set_light(&mut map, 0, 0, 0, 0);
+        crate::light::LightWorld::set_section_light(
+            &mut map,
+            0,
+            0,
+            0,
+            crate::chunk::Light::Uniform(0),
+        );
         assert_eq!(inserted, map.membership_revision());
         map.remove(&(0, 0));
         map.insert((1, 0), chunk);

crates/horizon-client/src/command_block.rs

@@ -35,6 +35,23 @@ impl Mode {
             Self::Redstone => "minecraft:command_block",
         }
     }
+    /// `Enum.ordinal`, which `ServerboundSetCommandBlockPacket` writes.
+    pub fn ordinal(self) -> i32 {
+        match self {
+            Self::Sequence => 0,
+            Self::Auto => 1,
+            Self::Redstone => 2,
+        }
+    }
+    /// The mode of a packet's ordinal; `handleSetCommandBlock` treats any
+    /// other value as a plain command block (its `default` branch).
+    pub fn from_ordinal(ordinal: i32) -> Self {
+        match ordinal {
+            0 => Self::Sequence,
+            1 => Self::Auto,
+            _ => Self::Redstone,
+        }
+    }
     /// `CycleButton`: the next value, wrapping round.
     pub fn next(self) -> Self {
         match self {

crates/horizon-client/src/container_screen.rs

@@ -124,6 +124,18 @@ impl Clicks {
         self.skip_next_release = true;
     }
 
+    /// The screen that takes the pointer over starts with its own state:
+    /// `AbstractContainerScreen` holds `isQuickCrafting` and the drag it
+    /// belongs to on the screen, so a screen that opens (or closes) drops
+    /// them. A press whose release never arrived -- the pointer left the
+    /// window -- would otherwise keep the drag running, and `press` answers
+    /// `None` for every later press, so the quick move and the clicks go
+    /// dead on every screen after it.
+    pub fn cancel_drag(&mut self) {
+        self.quick_crafting = None;
+        self.skip_next_release = false;
+    }
+
     /// `mouseClicked` (no double click): the `slotClicked` input it sends on
     /// `target`, if any. A press holding a stack starts a quick craft drag
     /// instead. `cloning` is `keyPickItem` with infinite materials.
@@ -301,4 +313,35 @@ mod tests {
             Some(Input::Pickup)
         );
     }
+
+    /// #1737: a press whose release never arrives (the pointer left the
+    /// window) leaves `isQuickCrafting` set, and `press` answers `None` for
+    /// every later press, so the Shift quick move and the clicks on the
+    /// inventory go dead. The drag belongs to the screen that has it
+    /// (`AbstractContainerScreen` holds `isQuickCrafting`), so the screen
+    /// that takes the pointer over drops it and the quick move works again.
+    #[test]
+    fn a_lost_release_does_not_wedge_the_quick_move() {
+        let mut clicks = Clicks::default();
+        let slot = Target::<usize>::Slot(3);
+        // Pressed with a stack carried: a quick craft drag starts, and its
+        // release never arrives.
+        assert_eq!(clicks.press(&slot, Button::Left, false, false, false), None);
+        assert!(clicks.quick_crafting().is_some());
+        // The stuck drag swallows the next press: the Shift quick move stops
+        // working and the inventory stops answering.
+        assert_eq!(clicks.press(&slot, Button::Right, true, true, false), None);
+        // The screen that takes the pointer over starts with its own state.
+        clicks.cancel_drag();
+        assert!(clicks.quick_crafting().is_none());
+        // The quick move works again.
+        assert_eq!(
+            clicks.press(&slot, Button::Right, true, true, false),
+            Some(Input::QuickMove)
+        );
+        assert_eq!(
+            clicks.press(&slot, Button::Left, true, false, false),
+            Some(Input::Pickup)
+        );
+    }
 }

crates/horizon-client/src/containers.rs

@@ -728,6 +728,18 @@ impl Furnace {
                                     .recipes_used
                                     .entry(recipe_used_key(&recipe.id))
                                     .or_insert(0) += 1;
+                                // AbstractFurnaceBlockEntity.burn: drying a wet sponge fills
+                                // the bucket in the fuel slot.
+                                if self.items[0]
+                                    .as_ref()
+                                    .is_some_and(|i| &*i.item == "minecraft:wet_sponge")
+                                    && self.items[1]
+                                        .as_ref()
+                                        .is_some_and(|f| &*f.item == "minecraft:bucket")
+                                {
+                                    self.items[1] =
+                                        Some(ItemStack::new("minecraft:water_bucket", 1));
+                                }
                                 if let Some(i) = self.items[0].as_mut() {
                                     i.count -= 1;
                                     if i.count == 0 {

crates/horizon-client/src/effects.rs

@@ -179,13 +179,14 @@ impl PlayerEffects {
         self.list.clear();
     }
     /// The effects of a saved player (`Player.active_effects`: id,
-    /// duration, amplifier, ambient, visible).
+    /// duration, amplifier, ambient, particles visible).
     pub fn from_saved(saved: &[(String, i32, i32, bool, bool)]) -> Self {
         let mut effects = Self::default();
-        for (id, duration, amplifier, ambient, _) in saved {
+        for (id, duration, amplifier, ambient, particles) in saved {
             if let Some(def) = brewing::effect(id) {
                 let mut e = EffectInstance::new(def.id, *duration, *amplifier);
                 e.ambient = *ambient;
+                e.visible = *particles;
                 effects.add(e);
             }
         }
@@ -213,8 +214,9 @@ impl PlayerEffects {
     }
     /// `LivingEntity.tickEffects` (server part) with the omens' effect ticks:
     /// `omen` answers `BadOmenMobEffect` (every tick) and `RaidOmenMobEffect`
-    /// (on its last tick). Returns the actions to apply, in order, and
-    /// whether Raid Omen was newly added.
+    /// (on its last tick); `absorption_empty` is `AbsorptionMobEffect`'s
+    /// answer: the effect ends once the absorption is used up. Returns the
+    /// actions to apply, in order, and whether Raid Omen was newly added.
     ///
     /// Bad Omen turning into a new Raid Omen adds an entry to the map being
     /// iterated: vanilla's iterator then throws a
@@ -224,6 +226,7 @@ impl PlayerEffects {
     pub fn tick_with(
         &mut self,
         omen: &mut dyn FnMut(&EffectInstance) -> OmenTick,
+        absorption_empty: bool,
     ) -> (Vec<EffectAction>, bool) {
         self.tick_count = self.tick_count.wrapping_add(1);
         let mut actions = Vec::new();
@@ -246,6 +249,7 @@ impl PlayerEffects {
             let answer = match e.id {
                 "bad_omen" => omen(e),
                 "raid_omen" if t == 1 => omen(e),
+                "absorption" if absorption_empty => OmenTick::Remove,
                 _ => OmenTick::Continue,
             };
             match answer {
@@ -465,13 +469,13 @@ mod tests {
         };
         // The first tick adds Raid Omen and stops there (the iterator's
         // ConcurrentModificationException): Bad Omen and Speed stay as they were.
-        let (_, added) = fx.tick_with(&mut convert);
+        let (_, added) = fx.tick_with(&mut convert, false);
         assert!(added);
         assert_eq!(fx.get("bad_omen").unwrap().duration, 100);
         assert_eq!(fx.get("speed").unwrap().duration, 50);
         assert_eq!(fx.get("raid_omen").unwrap().duration, 600);
         // The second refreshes Raid Omen and drops Bad Omen.
-        let (_, added) = fx.tick_with(&mut convert);
+        let (_, added) = fx.tick_with(&mut convert, false);
         assert!(!added);
         assert!(fx.get("bad_omen").is_none());
         assert_eq!(fx.get("speed").unwrap().duration, 49);
@@ -486,9 +490,9 @@ mod tests {
             seen.push(e.duration);
             OmenTick::Remove
         };
-        fx.tick_with(&mut watch);
+        fx.tick_with(&mut watch, false);
         assert!(fx.get("raid_omen").is_some());
-        fx.tick_with(&mut watch);
+        fx.tick_with(&mut watch, false);
         assert!(fx.get("raid_omen").is_none());
         assert_eq!(seen, vec![1]);
     }

crates/horizon-client/src/enchant.rs

@@ -545,6 +545,32 @@ impl Enchantments {
         }
         out
     }
+    /// `EnchantmentHelper.forEachModifier` as an item's tooltip lists them: the
+    /// `minecraft:attributes` effects of `stack`'s enchantments as rows of
+    /// (attribute, id, amount, operation, slot group), one per slot group the
+    /// enchantment lists.
+    pub fn modifier_rows(&self, stack: &ItemStack) -> Vec<(String, String, f64, String, String)> {
+        let mut rows = Vec::new();
+        for (id, level) in stack.enchantments() {
+            let Some(e) = self.get(id) else { continue };
+            for a in e.effects["minecraft:attributes"]
+                .as_array()
+                .into_iter()
+                .flatten()
+            {
+                for slot in &e.slots {
+                    rows.push((
+                        a["attribute"].as_str().unwrap_or("").to_owned(),
+                        a["id"].as_str().unwrap_or("").to_owned(),
+                        f64::from(level_value(&a["amount"], *level)),
+                        a["operation"].as_str().unwrap_or("add_value").to_owned(),
+                        slot.clone(),
+                    ));
+                }
+            }
+        }
+        rows
+    }
     /// Sum of `add_value` amounts of one attribute from enchantments on `stack`.
     pub fn attribute_add(&self, stack: Option<&ItemStack>, attribute: &str) -> f64 {
         stack.map_or(0.0, |s| {

crates/horizon-client/src/entities.rs

@@ -582,17 +582,21 @@ impl Experience {
             7 + level * 2
         }
     }
-    /// Returns true when a level was gained.
-    pub fn give(&mut self, points: i32) -> bool {
-        let start = self.level;
+    /// Returns the first multiple of 5 the player reached, where each level
+    /// gained would play the level-up sound (`Player.giveExperienceLevels`).
+    pub fn give(&mut self, points: i32) -> Option<i32> {
+        let mut sound_level = None;
         self.progress += points as f32 / Self::needed(self.level) as f32;
         self.total = self.total.saturating_add(points).max(0);
         while self.progress >= 1.0 {
             self.progress = (self.progress - 1.0) * Self::needed(self.level) as f32;
             self.level += 1;
+            if self.level % 5 == 0 {
+                sound_level.get_or_insert(self.level);
+            }
             self.progress /= Self::needed(self.level) as f32;
         }
-        self.level > start
+        sound_level
     }
 }
 /// A painting (`Painting`, a `HangingEntity`): the block it hangs in, the

crates/horizon-client/src/entity.wgsl

@@ -203,7 +203,7 @@ fn crumbling_uv(uv: vec2<f32>, packed_origin: vec2<f32>, sprite_size: vec2<f32>,
     // lit texture, then the lightmap, then the glint and fog.
     color = vec4(mix(in.overlay_color.rgb, color.rgb, in.overlay_color.a), color.a);
     color *= in.light_color;
-    if in.overlay == 7u || in.overlay == 8u {
+    if in.overlay == 7u || in.overlay == 8u || in.overlay == 33u {
         // Enchantment glint (overlay 7, 8 with the hurt tint): the purple
         // enchanted_glint sheen drifting diagonally over the item's shape.
         let px = in.uv * vec2<f32>(textureDimensions(atlas));
@@ -219,9 +219,22 @@ fn crumbling_uv(uv: vec2<f32>, packed_origin: vec2<f32>, sprite_size: vec2<f32>,
     return vec4(mix(color.rgb, globals.fog_color.rgb, f * globals.fog_color.a), color.a);
 }
 
+fn celestial_color(in: Out) -> vec4<f32> {
+    return textureSample(atlas, atlas_sampler, in.uv) * in.color * in.light_color;
+}
 @fragment fn fs_celestial(in: Out) -> @location(0) vec4<f32> {
-    let color = textureSample(atlas, atlas_sampler, in.uv) * in.color * in.light_color;
-    return color;
+    return celestial_color(in);
+}
+
+// The sky's celestial pass (sun, moon, the End sky): fs_celestial's light,
+// premultiplied for an additive (one, one) blend, and as alpha how much of it
+// the texel adds, which the blend takes off the frame's alpha. HDR output
+// (hdr.wgsl) lifts only where that left it low: the sun's and moon's discs, not
+// the dark rest of their quads or the dim End sky.
+@fragment fn fs_sky_celestial(in: Out) -> @location(0) vec4<f32> {
+    let color = celestial_color(in);
+    let added = color.rgb * color.a;
+    return vec4(added, smoothstep(0.1, 0.3, max(added.r, max(added.g, added.b))));
 }
 
 // RenderPipelines.WATER_MASK: depth only (the pipeline masks the colour off).

crates/horizon-client/src/entity_nbt.rs

@@ -180,7 +180,6 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
         ("Silent", m.silent),
         ("NoGravity", m.no_gravity),
         ("Glowing", m.glowing),
-        ("Invulnerable", m.invulnerable_flag),
     ] {
         if on {
             map.insert(key.into(), Tag::Byte(1));
@@ -188,6 +187,51 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
             map.remove(&horizon_world::nbt::JavaString::from(key));
         }
     }
+    // LivingEntity.addAdditionalSaveData: `active_effects` only when there are
+    // any (MobEffectInstance.CODEC; a mob's effects are never ambient, and one
+    // given with `hideParticles` shows neither particles nor its icon).
+    if m.extra.effects.is_empty() {
+        map.remove(&horizon_world::nbt::JavaString::from("active_effects"));
+    } else {
+        let effects = m
+            .extra
+            .effects
+            .iter()
+            .map(|&(effect, duration, amplifier)| {
+                let shown = !m.extra.hidden_effects.contains(&effect);
+                let mut e = vec![
+                    ("id", string(crate::brewing::namespaced(effect))),
+                    ("amplifier", Tag::Byte(amplifier.clamp(0, 255) as u8 as i8)),
+                    ("duration", Tag::Int(duration)),
+                ];
+                if !shown {
+                    e.push(("show_particles", Tag::Byte(0)));
+                }
+                e.push(("show_icon", Tag::Byte(i8::from(shown))));
+                Tag::compound(e)
+            });
+        map.insert("active_effects".into(), Tag::List(effects.collect()));
+    }
+    map.insert(
+        "Invulnerable".into(),
+        Tag::Byte(i8::from(m.invulnerable_flag)),
+    );
+    map.insert(
+        "LeftHanded".into(),
+        Tag::Byte(i8::from(m.extra.left_handed)),
+    );
+    // Keys of older formats that structure templates still carry.
+    for key in [
+        "HandItems",
+        "ArmorItems",
+        "HandDropChances",
+        "ArmorDropChances",
+        "Dimension",
+        "HurtByTimestamp",
+        "Leashed",
+    ] {
+        map.remove(&horizon_world::nbt::JavaString::from(key));
+    }
     if m.ticks_frozen > 0 {
         map.insert("TicksFrozen".into(), Tag::Int(m.ticks_frozen));
     } else {
@@ -197,7 +241,7 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
         ("AbsorptionAmount", Tag::Float(0)),
         ("FallFlying", Tag::Byte(0)),
         ("CanPickUpLoot", Tag::Byte(i8::from(m.can_pick_up_loot()))),
-        ("LeftHanded", Tag::Byte(0)),
+        ("current_impulse_context_reset_grace_time", Tag::Int(0)),
         (
             "Brain",
             Tag::compound([("memories", Tag::Compound(Compound::new()))]),
@@ -209,7 +253,7 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
     // Only breedable animals have an age; a loaded creature that was saved without
     // one (a frog) stays without.
     let aged = raw.is_none_or(|r| r.get("Age").is_some());
-    if m.kind.category == "creature" && aged {
+    if (m.kind.category == "creature" || m.species() == crate::mobs::Species::Hoglin) && aged {
         map.insert("Age".into(), Tag::Int(m.extra.age));
         map.insert("AgeLocked".into(), Tag::Byte(i8::from(m.extra.age_locked)));
         map.insert("ForcedAge".into(), Tag::Int(m.extra.forced_age));
@@ -225,7 +269,51 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
     if is_animal(id) {
         map.insert("InLove".into(), Tag::Int(m.extra.in_love.max(0)));
     }
+    let species = m.species();
+    if let Some((_, variant)) =
+        crate::mobs::finalize::species_variant_component(species, m.extra.variant)
+    {
+        map.insert("variant".into(), string(&variant));
+    }
+    if species == crate::mobs::Species::Chicken {
+        map.insert("EggLayTime".into(), Tag::Int(m.extra.egg_time));
+    }
+    let sounds = crate::mobs::finalize::sound_variants(species);
+    if !sounds.is_empty() {
+        let sound = m.extra.sound_variant.and_then(|i| sounds.get(i as usize));
+        let sound = sound.copied().unwrap_or("classic");
+        map.insert(
+            "sound_variant".into(),
+            string(&format!("minecraft:{sound}")),
+        );
+    }
     match id {
+        // Fox.addAdditionalSaveData; Horizon models only the type.
+        "minecraft:fox" => {
+            let kind = if m.extra.variant == 1 { "snow" } else { "red" };
+            map.insert("Type".into(), string(kind));
+            for (key, value) in [
+                ("Trusted", Tag::List(Vec::new())),
+                ("Sleeping", Tag::Byte(0)),
+                ("Sitting", Tag::Byte(0)),
+                ("Crouching", Tag::Byte(0)),
+            ] {
+                map.entry(key.into()).or_insert(value);
+            }
+        }
+        "minecraft:rabbit" => {
+            map.insert("RabbitType".into(), Tag::Int(i32::from(m.extra.variant)));
+            map.entry("MoreCarrotTicks".into()).or_insert(Tag::Int(0));
+        }
+        "minecraft:goat" => {
+            map.insert(
+                "IsScreamingGoat".into(),
+                Tag::Byte(i8::from(m.extra.screaming)),
+            );
+            let [left, right] = m.extra.lost_horns;
+            map.insert("HasLeftHorn".into(), Tag::Byte(i8::from(!left)));
+            map.insert("HasRightHorn".into(), Tag::Byte(i8::from(!right)));
+        }
         "minecraft:creeper" => {
             for (key, value) in [("Fuse", Tag::Short(30)), ("ExplosionRadius", Tag::Byte(3))] {
                 map.entry(key.into()).or_insert(value);
@@ -241,10 +329,6 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
             }
             map.insert("Sitting".into(), Tag::Byte(i8::from(m.extra.sitting)));
             map.insert("CollarColor".into(), Tag::Byte(m.extra.color as i8));
-            let variant = crate::mobs::tame::CAT_VARIANTS[(m.extra.variant as usize).min(10)];
-            map.insert("variant".into(), string(&format!("minecraft:{variant}")));
-            map.entry("sound_variant".into())
-                .or_insert_with(|| string("minecraft:classic"));
         }
         "minecraft:wolf" => {
             if let Some(owner) = m.extra.owner {
@@ -254,12 +338,12 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
             }
             map.insert("Sitting".into(), Tag::Byte(i8::from(m.extra.sitting)));
             map.insert("CollarColor".into(), Tag::Byte(m.extra.color as i8));
-            let variant = crate::mobs::tame::WOLF_VARIANTS[(m.extra.variant as usize).min(8)].0;
-            map.insert("variant".into(), string(&format!("minecraft:{variant}")));
-            map.entry("sound_variant".into())
-                .or_insert_with(|| string("minecraft:classic"));
         }
         "minecraft:piglin" | "minecraft:piglin_brute" | "minecraft:hoglin" => {
+            // Only Piglin.addAdditionalSaveData writes CannotHunt.
+            if id == "minecraft:piglin_brute" {
+                map.remove(&"CannotHunt".into());
+            }
             map.insert(
                 "IsImmuneToZombification".into(),
                 Tag::Byte(i8::from(m.extra.flag2)),
@@ -288,6 +372,10 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
         | "minecraft:trader_llama" => {
             map.insert("Tame".into(), Tag::Byte(i8::from(m.extra.tame)));
             map.insert("Temper".into(), Tag::Int(i32::from(m.extra.variant3)));
+            // AbstractHorse.addAdditionalSaveData; Horizon models neither.
+            for key in ["EatingHaystack", "Bred"] {
+                map.entry(key.into()).or_insert(Tag::Byte(0));
+            }
             if let Some(owner) = m.extra.owner {
                 map.insert("Owner".into(), Tag::IntArray(owner.to_vec()));
             }
@@ -403,7 +491,32 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
             crate::mobs::villager::write_nbt(m, map);
         }
         "minecraft:wandering_trader" => put_offers(map, m),
-        "minecraft:axolotl" => write_axolotl_memories(m, map),
+        "minecraft:axolotl" => {
+            write_axolotl_memories(m, map);
+            map.insert(
+                "Variant".into(),
+                Tag::Int(i32::from(m.extra.variant.min(4))),
+            );
+        }
+        "minecraft:parrot" => {
+            map.insert(
+                "Variant".into(),
+                Tag::Int(i32::from(m.extra.variant.min(4))),
+            );
+        }
+        "minecraft:salmon" => {
+            let size = SALMON_SIZES[usize::from(m.extra.variant).min(2)];
+            map.insert("type".into(), string(size));
+        }
+        // TropicalFish.addAdditionalSaveData: the packed variant.
+        "minecraft:tropical_fish" => {
+            let pattern = m.extra.variant.min(11);
+            let packed = i32::from(pattern >= 6)
+                | i32::from(pattern % 6) << 8
+                | i32::from(m.extra.variant2 & 15) << 16
+                | i32::from(m.extra.variant3 & 15) << 24;
+            map.insert("Variant".into(), Tag::Int(packed));
+        }
         "minecraft:allay" => {
             // InventoryCarrier: the fetched stack; the liked player memory.
             let mut inv = Vec::new();
@@ -498,8 +611,7 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
                 )])
             });
         }
-        "minecraft:zombie" => {
-            map.insert("IsBaby".into(), Tag::Byte(i8::from(m.is_baby())));
+        "minecraft:zombie" | "minecraft:husk" | "minecraft:drowned" => {
             for (key, value) in [
                 ("DrownedConversionTime", Tag::Int(-1)),
                 ("InWaterTime", Tag::Int(-1)),
@@ -532,6 +644,21 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
             Tag::Byte(i8::from(m.extra.can_break_doors)),
         );
     }
+    if matches!(
+        id,
+        "minecraft:zombie"
+            | "minecraft:husk"
+            | "minecraft:drowned"
+            | "minecraft:zombie_villager"
+            | "minecraft:zombified_piglin"
+            | "minecraft:piglin"
+            | "minecraft:zoglin"
+    ) {
+        map.insert("IsBaby".into(), Tag::Byte(i8::from(m.is_baby())));
+    }
+    if let Some(a) = m.extra.attributes.as_deref() {
+        put_attributes(map, m, a);
+    }
     crate::mobs::raider::write_nbt(m, map);
     crate::mobs::riders::write_nbt(m, map);
     // LivingEntity equipment: what the mob holds now.
@@ -614,6 +741,89 @@ pub fn mob_to_nbt(m: &Mob, uuid: [i32; 4], raw: Option<&Tag>) -> Tag {
     }
     tag
 }
+/// `AttributeMap.pack` for the attributes with a base or permanent modifier
+/// finalizeSpawn set, over the saved list.
+fn put_attributes(map: &mut Compound, m: &Mob, a: &crate::mobs::finalize::Attributes) {
+    use crate::mobs::finalize::{self, Attr, Op};
+    let mut list = match map.get(&"attributes".into()) {
+        Some(Tag::List(l)) => l.clone(),
+        _ => Vec::new(),
+    };
+    for attr in Attr::ALL {
+        let modifiers: Vec<Tag> = a
+            .modifiers
+            .iter()
+            .filter(|x| x.attr == attr)
+            .map(|x| {
+                let op = match x.op {
+                    Op::AddValue => "add_value",
+                    Op::AddMultipliedBase => "add_multiplied_base",
+                    Op::AddMultipliedTotal => "add_multiplied_total",
+                };
+                Tag::compound([
+                    ("id", string(x.id)),
+                    ("amount", Tag::Double(x.amount.to_bits())),
+                    ("operation", string(op)),
+                ])
+            })
+            .collect();
+        if modifiers.is_empty() && !a.bases.iter().any(|(b, _)| *b == attr) {
+            continue;
+        }
+        let id = format!("minecraft:{}", attr.name());
+        let mut entry = vec![
+            ("id", string(&id)),
+            ("base", Tag::Double(finalize::base_value(m, attr).to_bits())),
+        ];
+        if !modifiers.is_empty() {
+            entry.push(("modifiers", Tag::List(modifiers)));
+        }
+        let entry = Tag::compound(entry);
+        match list
+            .iter_mut()
+            .find(|t| text(t.get("id")).as_deref() == Some(id.as_str()))
+        {
+            Some(t) => *t = entry,
+            None => list.push(entry),
+        }
+    }
+    map.insert("attributes".into(), Tag::List(list));
+}
+/// `Brain.Packed`: the memories finalizeSpawn set, over the saved ones.
+pub fn put_brain(map: &mut Compound, m: &Mob, dimension: &str) {
+    if m.extra.memories.is_empty() {
+        return;
+    }
+    let mut memories = match map.get(&"Brain".into()).and_then(|b| b.get("memories")) {
+        Some(Tag::Compound(c)) => c.clone(),
+        _ => Compound::new(),
+    };
+    for &(name, value, ttl) in &m.extra.memories {
+        let value = match name {
+            "hunted_recently" => Tag::Byte(value as i8),
+            "home" => match m.extra.home {
+                Some(p) => Tag::compound([
+                    ("dimension", string(dimension)),
+                    ("pos", Tag::IntArray(p.to_vec())),
+                ]),
+                None => continue,
+            },
+            _ => Tag::Int(value as i32),
+        };
+        let mut memory = vec![("value", value)];
+        if ttl != i64::MAX {
+            memory.push(("ttl", Tag::Long(ttl)));
+        }
+        memories.insert(
+            format!("minecraft:{name}").as_str().into(),
+            Tag::compound(memory),
+        );
+    }
+    map.insert(
+        "Brain".into(),
+        Tag::compound([("memories", Tag::Compound(memories))]),
+    );
+}
 /// `CustomName`: a text component saved as a string or a `{text: ..}` compound.
 fn custom_name(tag: &Tag) -> Option<String> {
     match tag.get("CustomName")? {
@@ -633,6 +843,22 @@ pub fn name_text(tag: &Tag) -> Text {
         t => crate::scoreboard::comp_text(&crate::scoreboard::tag_to_json(t)),
     }
 }
+/// Mob.finalizeSpawn's follow range bonus in the saved attributes.
+pub(crate) fn spawn_bonus(tag: &Tag) -> Option<f64> {
+    let Some(Tag::List(attrs)) = tag.get("attributes") else {
+        return None;
+    };
+    let range = attrs
+        .iter()
+        .find(|a| text(a.get("id")).as_deref() == Some("minecraft:follow_range"))?;
+    let Some(Tag::List(modifiers)) = range.get("modifiers") else {
+        return None;
+    };
+    let bonus = modifiers
+        .iter()
+        .find(|x| text(x.get("id")).as_deref() == Some("minecraft:random_spawn_bonus"))?;
+    float(bonus.get("amount"))
+}
 pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -> Option<Mob> {
     let kind = types.get(&self::kind(tag)?)?.clone();
     let position = position(tag)?;
@@ -658,7 +884,18 @@ pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -
             }
         }
     }
+    if let Some(bonus) = spawn_bonus(tag) {
+        use crate::mobs::finalize::{Attr, Op, add_modifier};
+        let id = "minecraft:random_spawn_bonus";
+        add_modifier(&mut m, Attr::FollowRange, id, bonus, Op::AddMultipliedBase);
+    }
     m.health = float(tag.get("Health")).map_or(m.attrs.max_health, |h| h as f32);
+    // LivingEntity.setHealth clamps to the max health: a horse or llama is made
+    // with the type's and saved before it drops to the one it rolled. (Only
+    // the base is read here, so the clamp would cut a leader zombie's bonus.)
+    if crate::mobs::equine::is_equine(m.species()) {
+        m.health = m.health.min(m.attrs.max_health);
+    }
     m.hurt_time = number(tag.get("HurtTime")).unwrap_or(0) as i32;
     // What it holds (equipment.mainhand / offhand), when saved.
     if let Some(eq) = tag.get("equipment") {
@@ -699,7 +936,8 @@ pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -
     m.extra.pick_up_loot = flag(tag, "CanPickUpLoot");
     m.custom_name = custom_name(tag);
     m.custom_name_text = tag.get("CustomName").map(name_text);
-    if m.kind.category == "creature" {
+    m.extra.left_handed = flag(tag, "LeftHanded");
+    if m.kind.category == "creature" || m.species() == crate::mobs::Species::Hoglin {
         m.extra.age = number(tag.get("Age")).unwrap_or(0) as i32;
         m.extra.forced_age = number(tag.get("ForcedAge")).unwrap_or(0) as i32;
         m.extra.age_locked = flag(tag, "AgeLocked");
@@ -712,6 +950,25 @@ pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -
     m.no_gravity = flag(tag, "NoGravity");
     m.glowing = flag(tag, "Glowing");
     m.ticks_frozen = number(tag.get("TicksFrozen")).unwrap_or(0) as i32;
+    // LivingEntity.readAdditionalSaveData: the saved `active_effects`, the last
+    // entry of an effect winning.
+    if let Some(Tag::List(effects)) = tag.get("active_effects") {
+        for e in effects {
+            let Some(def) = text(e.get("id")).and_then(|id| crate::brewing::effect(&id)) else {
+                continue;
+            };
+            let effect = crate::brewing::namespaced(def.id);
+            let duration = number(e.get("duration")).unwrap_or(0) as i32;
+            let amplifier = number(e.get("amplifier")).unwrap_or(0) as i32;
+            m.extra.effects.retain(|x| x.0 != effect);
+            m.extra.effects.push((effect, duration, amplifier));
+            // Details.CODEC: `show_particles` defaults to true.
+            m.extra.hidden_effects.retain(|h| *h != effect);
+            if number(e.get("show_particles")) == Some(0) {
+                m.extra.hidden_effects.push(effect);
+            }
+        }
+    }
     m.silent = flag(tag, "Silent");
     m.invulnerable_flag = flag(tag, "Invulnerable");
     if m.species() == crate::mobs::Species::Bat {
@@ -793,20 +1050,45 @@ pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -
             m.extra.vector[0] = 0.7;
         }
     }
+    if crate::mobs::finalize::species_variant_component(m.species(), 0).is_some()
+        && let Some(v) = text(tag.get("variant"))
+    {
+        m.extra.variant = crate::mobs::finalize::variant_index(m.species(), &v);
+    }
+    if m.species() == crate::mobs::Species::Chicken
+        && let Some(t) = number(tag.get("EggLayTime"))
+    {
+        m.extra.egg_time = t as i32;
+    }
+    if let Some(v) = text(tag.get("sound_variant")) {
+        let v = v.trim_start_matches("minecraft:");
+        let sounds = crate::mobs::finalize::sound_variants(m.species());
+        m.extra.sound_variant = sounds.iter().position(|n| *n == v).map(|i| i as u8);
+    }
+    match m.species() {
+        crate::mobs::Species::Fox => {
+            m.extra.variant = u8::from(text(tag.get("Type")).as_deref() == Some("snow"));
+        }
+        crate::mobs::Species::Rabbit => {
+            // Rabbit.Variant.byId: an unknown id is brown.
+            m.extra.variant = match number(tag.get("RabbitType")).unwrap_or(0) {
+                v @ (0..=5 | 99) => v as u8,
+                _ => 0,
+            };
+        }
+        crate::mobs::Species::Goat => {
+            m.extra.screaming = flag(tag, "IsScreamingGoat");
+            let horn = |key| number(tag.get(key)).is_some_and(|v| v == 0);
+            m.extra.lost_horns = [horn("HasLeftHorn"), horn("HasRightHorn")];
+        }
+        _ => {}
+    }
     if m.species() == crate::mobs::Species::Cat {
         m.extra.owner = crate::save::uuid_from_tag(tag.get("Owner"));
         m.extra.tame = m.extra.owner.is_some();
         m.extra.sitting = flag(tag, "Sitting");
         m.extra.color =
             number(tag.get("CollarColor")).map_or(crate::mobs::tame::RED, |c| (c as u8) & 15);
-        if let Some(Tag::String(v)) = tag.get("variant") {
-            let v = v.to_string().unwrap_or_default();
-            let v = v.trim_start_matches("minecraft:");
-            m.extra.variant = crate::mobs::tame::CAT_VARIANTS
-                .iter()
-                .position(|n| *n == v)
-                .unwrap_or(0) as u8;
-        }
     }
     if m.species() == crate::mobs::Species::Wolf {
         let health = m.health;
@@ -817,14 +1099,6 @@ pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -
         m.extra.sitting = flag(tag, "Sitting");
         m.extra.color =
             number(tag.get("CollarColor")).map_or(crate::mobs::tame::RED, |c| (c as u8) & 15);
-        if let Some(Tag::String(v)) = tag.get("variant") {
-            let v = v.to_string().unwrap_or_default();
-            let v = v.trim_start_matches("minecraft:");
-            m.extra.variant = crate::mobs::tame::WOLF_VARIANTS
-                .iter()
-                .position(|(n, _)| *n == v)
-                .unwrap_or(0) as u8;
-        }
     }
     if matches!(
         m.species(),
@@ -843,6 +1117,7 @@ pub fn mob_from_nbt(tag: &Tag, types: &HashMap<String, Arc<MobType>>, id: u32) -
     if m.species() == crate::mobs::Species::Axolotl {
         restore_axolotl_memories(&mut m, tag);
     }
+    read_variant(&mut m, tag);
     m.fire_ticks = number(tag.get("Fire")).unwrap_or(0) as i32;
     m.air = number(tag.get("Air")).unwrap_or(300) as i32;
     if m.species() == crate::mobs::Species::Allay {
@@ -2024,6 +2299,41 @@ fn write_axolotl_memories(m: &Mob, map: &mut Compound) {
         }
     }
 }
+/// The variant tags `Axolotl`, `Rabbit`, `Parrot`, `Salmon` and
+/// `TropicalFish` read; a missing tag is the default variant (a medium
+/// salmon, otherwise index 0).
+fn read_variant(m: &mut Mob, tag: &Tag) {
+    use crate::mobs::Species as S;
+    let int = |key| number(tag.get(key)).unwrap_or(0) as i32;
+    match m.species() {
+        S::Axolotl | S::Parrot => m.extra.variant = int("Variant").clamp(0, 4) as u8,
+        // Rabbit.Variant.LEGACY_CODEC: an unknown id is brown.
+        S::Rabbit => {
+            m.extra.variant = match int("RabbitType") {
+                v @ (0..=5 | 99) => v as u8,
+                _ => 0,
+            }
+        }
+        S::Salmon => {
+            m.extra.variant = text(tag.get("type"))
+                .and_then(|t| SALMON_SIZES.iter().position(|v| *v == t))
+                .unwrap_or(1) as u8;
+        }
+        S::TropicalFish => {
+            let packed = int("Variant");
+            let (size, index) = (packed & 0xFF, (packed >> 8) & 0xFF);
+            // TropicalFish.Pattern.byId: an unknown id is a kob.
+            m.extra.variant = if size <= 1 && index < 6 {
+                (size * 6 + index) as u8
+            } else {
+                0
+            };
+            m.extra.variant2 = ((packed >> 16) & 15) as u8;
+            m.extra.variant3 = ((packed >> 24) & 15) as u8;
+        }
+        _ => {}
+    }
+}
 fn restore_axolotl_memories(m: &mut Mob, tag: &Tag) {
     let memories = tag.get("Brain").and_then(|b| b.get("memories"));
     let ttl = memories
@@ -2425,6 +2735,123 @@ mod sheep_nbt_tests {
         let back = mob_from_nbt(&tag, &types, 2).unwrap();
         assert_eq!((back.extra.color, back.extra.sheared), (14, true));
     }
+
+    #[test]
+    fn farm_animals_keep_their_variant_and_sound_variant() {
+        let root = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
+            .join("../../.local/horizon-client")
+            .join(horizon_core::VANILLA_VERSION);
+        if !root.join("items.json").exists() {
+            return;
+        }
+        let data = crate::mobs::MobTypes::load(&root).unwrap();
+        let types: HashMap<String, Arc<MobType>> = data
+            .types
+            .iter()
+            .map(|(k, v)| (k.clone(), Arc::new(v.clone())))
+            .collect();
+        let mut m = Mob::new(
+            1,
+            types["minecraft:pig"].clone(),
+            Vec3::new(0.0, 4.0, 0.0),
+            0.0,
+        );
+        let tag = mob_to_nbt(&m, [1, 2, 3, 4], None);
+        assert_eq!(
+            text(tag.get("variant")).as_deref(),
+            Some("minecraft:temperate")
+        );
+        assert_eq!(
+            text(tag.get("sound_variant")).as_deref(),
+            Some("minecraft:classic")
+        );
+        // Spawned in a warm biome with the mini sounds.
+        (m.extra.variant, m.extra.sound_variant) = (1, Some(2));
+        let tag = mob_to_nbt(&m, [1, 2, 3, 4], None);
+        assert_eq!(text(tag.get("variant")).as_deref(), Some("minecraft:warm"));
+        assert_eq!(
+            text(tag.get("sound_variant")).as_deref(),
+            Some("minecraft:mini")
+        );
+        let back = mob_from_nbt(&tag, &types, 2).unwrap();
+        assert_eq!((back.extra.variant, back.extra.sound_variant), (1, Some(2)));
+        let mut hen = Mob::new(
+            3,
+            types["minecraft:chicken"].clone(),
+            Vec3::new(0.0, 4.0, 0.0),
+            0.0,
+        );
+        (hen.extra.variant, hen.extra.egg_time) = (2, 7795);
+        let tag = mob_to_nbt(&hen, [1, 2, 3, 4], None);
+        assert_eq!(text(tag.get("variant")).as_deref(), Some("minecraft:cold"));
+        let back = mob_from_nbt(&tag, &types, 4).unwrap();
+        assert_eq!((back.extra.variant, back.extra.egg_time), (2, 7795));
+        // The sound variants are indices into the registries finalizeSpawn draws from.
+        use crate::mobs::{Species, finalize};
+        let registries = finalize::SpawnRegistries::load(&root);
+        for (species, registry) in [
+            (Species::Pig, &registries.pig_sound),
+            (Species::Cow, &registries.cow_sound),
+            (Species::Chicken, &registries.chicken_sound),
+            (Species::Cat, &registries.cat_sound),
+            (Species::Wolf, &registries.wolf_sound),
+        ] {
+            assert_eq!(
+                finalize::sound_variants(species),
+                registry.names,
+                "{species:?}"
+            );
+        }
+    }
+
+    #[test]
+    fn foxes_rabbits_and_goats_keep_their_kind() {
+        let root = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
+            .join("../../.local/horizon-client")
+            .join(horizon_core::VANILLA_VERSION);
+        if !root.join("items.json").exists() {
+            return;
+        }
+        let data = crate::mobs::MobTypes::load(&root).unwrap();
+        let types: HashMap<String, Arc<MobType>> = data
+            .types
+            .iter()
+            .map(|(k, v)| (k.clone(), Arc::new(v.clone())))
+            .collect();
+        let new = |kind: &str| Mob::new(1, types[kind].clone(), Vec3::new(0.0, 4.0, 0.0), 0.0);
+        let round_trip = |m: &Mob| {
+            let tag = mob_to_nbt(m, [1, 2, 3, 4], None);
+            (mob_from_nbt(&tag, &types, 2).unwrap(), tag)
+        };
+        let mut fox = new("minecraft:fox");
+        fox.extra.variant = 1;
+        let (back, tag) = round_trip(&fox);
+        assert_eq!(text(tag.get("Type")).as_deref(), Some("snow"));
+        assert_eq!(number(tag.get("Sleeping")), Some(0));
+        assert_eq!(back.extra.variant, 1);
+        let mut rabbit = new("minecraft:rabbit");
+        rabbit.extra.variant = 4;
+        let (back, tag) = round_trip(&rabbit);
+        assert_eq!(number(tag.get("RabbitType")), Some(4));
+        assert_eq!(back.extra.variant, 4);
+        let mut goat = new("minecraft:goat");
+        (goat.extra.screaming, goat.extra.lost_horns) = (true, [false, true]);
+        let (back, tag) = round_trip(&goat);
+        assert_eq!(number(tag.get("HasRightHorn")), Some(0));
+        assert_eq!(
+            (back.extra.screaming, back.extra.lost_horns),
+            (true, [false, true])
+        );
+        // A goat saved without horn flags has both, as vanilla reads it.
+        let bare = Tag::compound([
+            ("id", string("minecraft:goat")),
+            ("Pos", doubles(&[0.5, 64.0, 0.5])),
+        ]);
+        assert_eq!(
+            mob_from_nbt(&bare, &types, 3).unwrap().extra.lost_horns,
+            [false; 2]
+        );
+    }
 }
 
 #[cfg(test)]

crates/horizon-client/src/falling_block.rs

@@ -35,6 +35,18 @@ impl Damage {
             ..Self::default()
         }
     }
+    /// A block that starts to fall: anvils hurt, and a brushable block
+    /// breaks where it lands (BrushableBlock.tick: disableDrop).
+    pub fn falling(block: &str) -> Self {
+        if block.ends_with("anvil") {
+            Self::anvil()
+        } else {
+            Self {
+                cancel_drop: block.starts_with("minecraft:suspicious_"),
+                ..Self::default()
+            }
+        }
+    }
     pub fn from_nbt(tag: &Tag, anvil: bool) -> Self {
         Self {
             hurt_entities: number(tag.get("HurtEntities")).map_or(anvil, |v| v != 0),
@@ -181,6 +193,14 @@ pub fn hurt_mobs(mobs: &mut [Mob], position: Vec3, amount: f32) {
 #[cfg(test)]
 mod tests {
     use super::*;
+    #[test]
+    fn only_brushable_blocks_break_where_they_land() {
+        assert!(Damage::falling("minecraft:suspicious_gravel").cancel_drop);
+        assert!(Damage::falling("minecraft:suspicious_sand").cancel_drop);
+        assert!(!Damage::falling("minecraft:gravel").cancel_drop);
+        assert!(Damage::falling("minecraft:chipped_anvil").hurt_entities);
+    }
+
     #[test]
     fn impact_uses_ceil_distance_capped_damage_and_positive_damage_wear() {
         let damage = Damage::anvil();

crates/horizon-client/src/font.rs

@@ -889,12 +889,17 @@ impl Font {
         if s.contains('§') {
             return self.width_text(&Text::legacy(s));
         }
-        s.chars().map(|c| self.glyph(c).advance).sum::<f32>().ceil()
+        crate::bidi::visual_str(s)
+            .chars()
+            .map(|c| self.glyph(c).advance)
+            .sum::<f32>()
+            .ceil()
     }
     /// Font.width of a component: `§` codes in the spans are formatting,
-    /// not glyphs.
+    /// not glyphs. Right-to-left text is measured as it is drawn, shaped.
     pub fn width_text(&self, t: &Text) -> f32 {
-        t.resolved()
+        let t = t.resolved();
+        crate::bidi::visual(&t)
             .chars()
             .map(|(c, s)| self.advance(c, s))
             .sum::<f32>()

crates/horizon-client/src/game/advancements.rs

@@ -708,6 +708,27 @@ impl Game<'_> {
         let it = item_view(stack);
         self.trigger(name, |c, w| adv::item_entity(c, &me, target, &it, w));
     }
+    /// `TradeTrigger`: the villager and the item the trade gave.
+    pub(super) fn trigger_trade(&mut self, villager: &EntityView, stack: &ItemStack) {
+        let me = self.player_entity();
+        let villager = villager.clone();
+        let it = item_view(stack);
+        self.trigger("minecraft:villager_trade", move |c, w| {
+            let pctx = adv::Entities {
+                this: Some(&me),
+                origin: me.position,
+                tool: None,
+                block_pos: None,
+            };
+            let vctx = adv::Entities {
+                this: Some(&villager),
+                ..pctx
+            };
+            adv::conditions(&c["player"], &pctx, w)
+                && adv::conditions(&c["villager"], &vctx, w)
+                && adv::item(&c["item"], &it, w)
+        });
+    }
     /// `EnterBlockTrigger`: the block, its state properties and the player.
     pub(super) fn trigger_enter_block(&mut self, state: horizon_world::registry::BlockStateId) {
         let Some(definition) = self.pack.assets.registry.state(state).cloned() else {

crates/horizon-client/src/game/agent.rs

@@ -419,6 +419,9 @@ impl Game<'_> {
             Screen::Advancements => "advancements",
             Screen::WorldOptions => "world-options",
             Screen::Friends => "friends",
+            Screen::ServerLinks => "server-links",
+            Screen::ConfirmLink => "confirm-link",
+            Screen::DialogWarning => "dialog-warning",
             Screen::CommandBlock => "command-block",
             Screen::Win => "win",
             Screen::Mod => "mod",
@@ -707,9 +710,12 @@ impl Game<'_> {
             // the recipe buttons of the page, page arrows, filter and tabs.
             let book = self.recipe_book_targets();
             if !book.is_empty() {
+                let (open, filtering) = self.recipe_book_flags().unwrap_or_default();
                 v["recipe_book"] = json!({
                     "targets": book.iter().map(|t| t.rect).collect::<Vec<_>>(),
                     "known": self.recipe_book_known(),
+                    "open": open,
+                    "filtering": filtering,
                 });
             }
             v["slot_ids"] = json!(

crates/horizon-client/src/game/allays.rs

@@ -131,7 +131,8 @@ impl Game<'_> {
         let m = &mut self.mobs[i];
         m.extra.ints[1] -= 1;
         m.extra.ints[3] = 60;
-        self.spawn_item(ItemStack::new(&item, 1), from, v, 40);
+        // ItemEntity.setDefaultPickUpDelay.
+        self.spawn_item(ItemStack::new(&item, 1), from, v, 10);
         if self.world.game_time % 7 == 0 && self.world.random.next_double() < 0.9 {
             const PITCHES: [f32; 16] = [
                 0.5625, 0.625, 0.75, 0.9375, 1.0, 1.0, 1.125, 1.25, 1.5, 1.875, 2.0, 2.25, 2.5,

crates/horizon-client/src/game/block_entity_anims.rs

@@ -547,7 +547,7 @@ impl Game<'_> {
         });
     }
     /// `Entity.isInRain`: rain at the block position or at the top of the box.
-    fn in_rain(&mut self, at: Vec3, top: f64) -> bool {
+    pub(super) fn in_rain(&mut self, at: Vec3, top: f64) -> bool {
         let p = BlockPos::new(
             at.x.floor() as i32,
             at.y.floor() as i32,

crates/horizon-client/src/game/boats.rs

@@ -862,7 +862,7 @@ impl Game<'_> {
         let a = alpha as f32;
         let range = super::entity_culling::default_range(
             glam::DVec3::new(WIDTH, HEIGHT, WIDTH),
-            self.settings.entity_distance,
+            self.view_scale(),
         );
         for b in &self.boats {
             let entity_start = out.len();

crates/horizon-client/src/game/books.rs

@@ -1009,9 +1009,12 @@ impl Game<'_> {
             }
         };
         let indicator = |batch: &mut HudBatch, page: usize, count: usize| {
-            let text = tr("book.pageIndicator", "Page %s of %s")
-                .replacen("%s", &(page + 1).to_string(), 1)
-                .replacen("%s", &count.max(1).to_string(), 1);
+            // BookViewScreen.getPageNumberMessage: 26.3's en_us template is
+            // positional ("Page %1$s of %2$s").
+            let text = horizon_protocol::text::format_java(
+                &tr("book.pageIndicator", "Page %1$s of %2$s"),
+                &[(page + 1).to_string(), count.max(1).to_string()],
+            );
             let tw = HudBatch::text_width(atlas, &text);
             batch.text(atlas, &text, left + 148.0 - tw, top + 16.0, BLACK, false);
         };

crates/horizon-client/src/game/bundles.rs

@@ -0,0 +1,103 @@
+//! `BundleMouseActions`: the wheel over a bundle in a container screen selects
+//! one of the items it shows, which a click that takes one out of it then takes
+//! (`BundleContents.Mutable.removeOne`). Moving off the bundle clears the
+//! selection. On a server the selection is sent to it (`ServerboundSelectBundleItemPacket`).
+use super::{Game, Screen};
+use horizon_client::{
+    bundle::{Contents, toggle_selected},
+    mouse::ScrollWheelHandler,
+};
+use horizon_protocol::packets::play::{self, Serverbound as S};
+
+#[derive(Default)]
+pub(super) struct BundleMouse {
+    wheel: ScrollWheelHandler,
+    /// The slot under the cursor at the last tick (`AbstractContainerScreen.hoveredSlot`).
+    hovered: Option<usize>,
+}
+
+impl Game<'_> {
+    /// A slot a bundle can be selected in: the player's inventory, the off hand and a
+    /// container's own slots. A server only knows these in the inventory and chest-like menus.
+    fn bundle_slot(&mut self, slot: usize) -> bool {
+        (slot < 36 || slot == 504 || (300..500).contains(&slot))
+            && (self.remote.is_none() || self.remote_storage_open())
+            && (slot < 36 || slot == 504 || self.slots().contains(&slot))
+    }
+
+    /// `BundleMouseActions.onMouseScrolled`: the wheel over a bundle moves the selection
+    /// through the items its tooltip shows. True when the bundle took the wheel.
+    pub(super) fn bundle_scroll(&mut self, x: f64, y: f64) -> bool {
+        let Some(slot) = self.inventory_target().0 else {
+            return false;
+        };
+        if !self.bundle_slot(slot) {
+            return false;
+        }
+        let stack = self.slot_mut(slot).clone();
+        let items = self.res.items();
+        let Some(bundle) = stack.filter(|s| items.get(&s.item).is_some_and(|i| i.bundle)) else {
+            return false;
+        };
+        let shown = Contents::of(items, &bundle).map_or(0, |c| c.shown_count());
+        if shown == 0 {
+            return false;
+        }
+        let (wheel_x, wheel_y) = self.bundle_mouse.wheel.on_mouse_scroll(x, y);
+        let wheel = if wheel_y == 0 { -wheel_x } else { wheel_y };
+        if wheel != 0 {
+            let selected = bundle.data().map_or(-1, |d| d.bundle_selected.0);
+            let next = ScrollWheelHandler::next_selection(f64::from(wheel), selected, shown as i32);
+            if next != selected {
+                self.select_bundle(slot, next);
+            }
+        }
+        true
+    }
+
+    /// `BundleMouseActions.toggleSelectedBundleItem`: the stack here and, on a server, there.
+    fn select_bundle(&mut self, slot: usize, index: i32) {
+        if let Some(stack) = self.slot_mut(slot) {
+            toggle_selected(stack, index);
+        }
+        if self.remote.is_some() {
+            let (_, menu) = self.remote_menu();
+            if let Some(menu_slot) = Self::menu_slot_index(&menu, slot) {
+                self.send(S::SelectBundleItem(play::SelectBundleItem {
+                    slot: menu_slot as i32,
+                    index,
+                }));
+            }
+        }
+    }
+
+    /// `BundleMouseActions.unselectedBundleItem` for the bundle in `slot`, if it has a selection.
+    pub(super) fn unselect_bundle(&mut self, slot: usize) {
+        if !self.bundle_slot(slot) {
+            return;
+        }
+        let selected = self
+            .slot_mut(slot)
+            .as_ref()
+            .and_then(|s| s.data())
+            .is_some_and(|d| d.bundle_selected.0 >= 0);
+        if selected {
+            self.select_bundle(slot, -1);
+        }
+    }
+
+    /// `AbstractContainerScreen.onStopHovering` (and `onClose`): leaving a slot, or the
+    /// screen, clears the bundle's selection.
+    pub(super) fn tick_bundle_hover(&mut self) {
+        let now = if self.screen == Screen::Inventory {
+            self.inventory_target().0
+        } else {
+            None
+        };
+        if let Some(left) = std::mem::replace(&mut self.bundle_mouse.hovered, now)
+            && Some(left) != now
+        {
+            self.unselect_bundle(left);
+        }
+    }
+}

crates/horizon-client/src/game/chat.rs

@@ -789,6 +789,11 @@ impl Game<'_> {
     pub(super) fn sync_rules(&mut self) {
         self.world.health_rules.natural_regeneration =
             self.ui.rules.bool("natural_health_regeneration");
+        // Player.isInvulnerableTo: the damage-type rules.
+        self.world.health_rules.drowning_damage = self.ui.rules.bool("drowning_damage");
+        self.world.health_rules.fall_damage = self.ui.rules.bool("fall_damage");
+        self.world.health_rules.fire_damage = self.ui.rules.bool("fire_damage");
+        self.world.health_rules.freeze_damage = self.ui.rules.bool("freeze_damage");
         use horizon_world::food::Difficulty;
         self.world.health_rules.difficulty = match self.ui.difficulty {
             0 => Difficulty::Peaceful,
@@ -801,7 +806,11 @@ impl Game<'_> {
     pub(super) fn load_world_state(&mut self) {
         self.ui.rules = GameRules::load(&self.world_root);
         self.ui.clock = WorldClock::default();
-        self.ui.difficulty = read_difficulty(&self.world_root).unwrap_or(2);
+        // PrimaryLevelData: the difficulty comes back from level.dat's difficulty_settings.
+        self.ui.difficulty = horizon_client::title::DIFFICULTIES
+            .iter()
+            .position(|d| *d == self.level.difficulty)
+            .map_or(2, |i| i as u8);
         if let Ok(bytes) = std::fs::read(self.world_root.join("data/minecraft/world_clocks.dat"))
             && let Ok(raw) = horizon_world::compression::Compression::Gzip.decode(&bytes, 1 << 20)
             && let Ok((root, _)) =
@@ -826,9 +835,9 @@ impl Game<'_> {
         self.build_registries();
         self.sync_rules();
     }
-    /// Save the clock and the difficulty beside level.dat (Level.write saves
-    /// the game rules: a second writer of game_rules.dat could leave it with
-    /// the rules loaded when the world opened).
+    /// Save the clock beside level.dat (Level.write saves the game rules: a
+    /// second writer of game_rules.dat could leave it with the rules loaded
+    /// when the world opened).
     pub(super) fn save_world_state(&mut self) {
         if self.world_root.as_os_str().is_empty() {
             return;
@@ -876,9 +885,6 @@ impl Game<'_> {
         if let Err(e) = horizon_client::save::write_dat(&path, root) {
             log::warn!("the world clocks were not written: {e}");
         }
-        if let Err(e) = write_difficulty(&self.world_root, self.ui.difficulty) {
-            log::warn!("the difficulty was not written: {e}");
-        }
     }
     /// Death message in chat (CombatTracker.getDeathMessage, as far as the
     /// cause is known to the client).
@@ -988,34 +994,6 @@ pub fn screenshot_name(dir: &std::path::Path) -> String {
         n += 1;
     }
 }
-fn read_difficulty(world: &std::path::Path) -> Option<u8> {
-    let bytes = std::fs::read(world.join("level.dat")).ok()?;
-    let raw = horizon_world::compression::Compression::Gzip
-        .decode(&bytes, 64 << 20)
-        .ok()?;
-    let (root, _) =
-        horizon_world::nbt::read_named(&raw, horizon_world::nbt::Limits::default()).ok()?;
-    match root.tag.get("Data")?.get("Difficulty")? {
-        horizon_world::nbt::Tag::Byte(b) => Some((*b).clamp(0, 3) as u8),
-        _ => None,
-    }
-}
-/// Patch `Data.Difficulty` in level.dat (Level::write stores the default).
-fn write_difficulty(world: &std::path::Path, difficulty: u8) -> horizon_client::Result<()> {
-    use horizon_world::{compression::Compression, nbt};
-    let path = world.join("level.dat");
-    let bytes = std::fs::read(&path)?;
-    let raw = Compression::Gzip.decode(&bytes, 64 << 20)?;
-    let (mut root, _) = nbt::read_named(&raw, nbt::Limits::default()).map_err(|e| e.to_string())?;
-    if let Some(data) = root.tag.get_mut("Data")
-        && let Some(d) = data.get_mut("Difficulty")
-    {
-        *d = nbt::Tag::Byte(difficulty as i8);
-    }
-    let out = nbt::write_named(&root, nbt::Limits::default()).map_err(|e| e.to_string())?;
-    std::fs::write(&path, Compression::Gzip.encode(&out)?)?;
-    Ok(())
-}
 
 /// `IntegratedServer.getProfilePermissions` for the owner: `OWNER` (4) when
 /// commands are allowed, else `ALL` (0).

crates/horizon-client/src/game/client_ambient.rs

@@ -4,8 +4,12 @@
 //! on the game that has the window, in-frame or following a server, never on
 //! a server: nothing of them goes over the network.
 use super::Game;
+use horizon_client::blocks::RenderShape;
 use horizon_client::mobs::{MobEvent, ambient};
-use horizon_client::particles::{ParticleOptions, ParticleType};
+use horizon_client::motion::{LAVA, WATER};
+use horizon_client::particles::{ParticleEngine, ParticleOptions, ParticleType};
+use horizon_client::pose::Pose;
+use horizon_core::{geometry::Vec3, random::RandomSource};
 
 impl Game<'_> {
     pub(super) fn tick_client_ambient(&mut self) {
@@ -33,5 +37,209 @@ impl Game<'_> {
             }
         }
         self.eye_particles();
+        self.sprint_dust();
+        self.effect_swirls();
+    }
+
+    /// `Entity.baseTick`'s `spawnSprintParticle` on a client: dust of the
+    /// block under a sprinting player's feet streams back from them every
+    /// tick, for the window's own player and for the other players it sees.
+    fn sprint_dust(&mut self) {
+        // Each runner's feet, movement and supporting block.
+        let mut runners: Vec<(Vec3, Vec3, Option<[i32; 3]>)> = Vec::new();
+        // Entity.canSpawnSprintParticle.
+        if let Some(p) = self.player.as_ref()
+            && p.sprinting
+            && !p.spectator
+            && p.pose != Pose::Crouching
+            && !p.health.dead_or_dying()
+            && !p.fluids.was_touching_water
+            && !p.is_in_lava()
+            && p.fluid_height(WATER) <= 0.0
+            && p.fluid_height(LAVA) <= 0.0
+        {
+            let support = p.ground.supporting_block.map(|b| [b.x, b.y, b.z]);
+            runners.push((p.position, p.velocity, support));
+        }
+        let guests = self.lan.iter().flat_map(|host| host.models.values());
+        for m in self.mobs.iter().chain(guests) {
+            // Another player's fluids aren't known here: none where they stand.
+            let feet = [
+                m.position.x.floor() as i32,
+                m.position.y.floor() as i32,
+                m.position.z.floor() as i32,
+            ];
+            if m.extra.sprinting
+                && !m.extra.crouching
+                && m.alive()
+                && &*m.kind.id == "minecraft:player"
+                && self
+                    .res
+                    .facts()
+                    .get(self.world.block(feet[0], feet[1], feet[2]))
+                    .fluid_level
+                    == 0
+            {
+                runners.push((m.position, m.position.subtract(m.previous), None));
+            }
+        }
+        for (position, movement, support) in runners {
+            // Entity.getOnPosLegacy: getOnPos(0.2).
+            let below = (position.y - f64::from(0.2f32)).floor() as i32;
+            let tall = |game: &Self, s: [i32; 3]| {
+                let name = game.block_name(s);
+                [
+                    "minecraft:fences",
+                    "minecraft:walls",
+                    "minecraft:fence_gates",
+                ]
+                .iter()
+                .any(|tag| game.block_in_tag(tag, &name))
+            };
+            let at = match support {
+                Some(s) if tall(self, s) => s,
+                Some(s) => [s[0], below, s[2]],
+                None => [position.x.floor() as i32, below, position.z.floor() as i32],
+            };
+            let state = self.world.block(at[0], at[1], at[2]);
+            if self.res.facts().get(state).render_shape == RenderShape::Invisible {
+                continue;
+            }
+            let Some((sprite, tint)) = self.particle_sprite(state, at) else {
+                continue;
+            };
+            let width = f64::from(0.6f32);
+            let r = self.particles.random();
+            let mut x = position.x + (r.next_double() - 0.5) * width;
+            let mut z = position.z + (r.next_double() - 0.5) * width;
+            // Clamped into the block when the feet are in another column.
+            if position.x.floor() as i32 != at[0] {
+                x = x.clamp(f64::from(at[0]), f64::from(at[0]) + 1.0);
+            }
+            if position.z.floor() as i32 != at[2] {
+                z = z.clamp(f64::from(at[2]), f64::from(at[2]) + 1.0);
+            }
+            self.particles.add(
+                &ParticleOptions::block(ParticleType::Block, sprite, tint),
+                [x, position.y + 0.1, z],
+                [movement.x * -4.0, 1.5, movement.z * -4.0],
+            );
+        }
+    }
+
+    /// `LivingEntity.tickEffects` on a client: the swirls around an entity
+    /// with visible effects, from the particles its synched data lists. The
+    /// window's player has its own effects, a server's mobs and players the
+    /// list the server sent, and the mobs and guests of a game in the frame
+    /// theirs.
+    fn effect_swirls(&mut self) {
+        if let Some(p) = self.player.as_ref() {
+            let effects = &self.potions.effects.list;
+            let list: Vec<_> = effects
+                .iter()
+                .filter(|e| e.visible)
+                .filter_map(|e| effect_particle(e.id, e.ambient))
+                .collect();
+            let ambient = effects.iter().filter(|e| e.visible).all(|e| e.ambient);
+            let invisible = effects.iter().any(|e| e.id == "invisibility");
+            let size = (
+                f64::from(p.dimensions.width),
+                f64::from(p.dimensions.height),
+            );
+            swirl(
+                &mut self.particles,
+                p.position,
+                size,
+                &list,
+                ambient,
+                invisible,
+            );
+        }
+        let guests = self.lan.iter().flat_map(|host| host.models.values());
+        for m in self.mobs.iter().chain(guests) {
+            if !m.alive() {
+                continue;
+            }
+            let size = (f64::from(m.width()), f64::from(m.height()));
+            let invisible = m.invisible || m.has_effect("minecraft:invisibility");
+            if m.extra.effect_particles.is_empty() {
+                // A mob of this game: its own effects, visible and not ambient.
+                if m.extra.effects.is_empty() {
+                    continue;
+                }
+                let list: Vec<_> = m
+                    .extra
+                    .effects
+                    .iter()
+                    .filter(|e| !m.extra.hidden_effects.contains(&e.0))
+                    .filter_map(|e| effect_particle(e.0, false))
+                    .collect();
+                swirl(
+                    &mut self.particles,
+                    m.position,
+                    size,
+                    &list,
+                    false,
+                    invisible,
+                );
+            } else {
+                let list = &m.extra.effect_particles;
+                let ambient = m.extra.effect_ambient;
+                swirl(
+                    &mut self.particles,
+                    m.position,
+                    size,
+                    list,
+                    ambient,
+                    invisible,
+                );
+            }
+        }
     }
 }
+
+/// `MobEffect.particleFactory`: the omens have particles of their own, any
+/// other effect an entity effect in its colour, faint when ambient.
+pub(super) fn effect_particle(effect: &str, ambient: bool) -> Option<ParticleOptions> {
+    Some(match effect.trim_start_matches("minecraft:") {
+        "trial_omen" => ParticleOptions::simple(ParticleType::TrialOmen),
+        "raid_omen" => ParticleOptions::simple(ParticleType::RaidOmen),
+        other => {
+            let color = horizon_client::brewing::effect(other)?.color;
+            let channel = |shift: u32| ((color >> shift) & 255) as f32 / 255.0;
+            // MobEffect.AMBIENT_ALPHA is 38 of 255.
+            let alpha = if ambient { 38.0 / 255.0 } else { 1.0 };
+            ParticleOptions::colored(
+                ParticleType::EntityEffect,
+                [channel(16), channel(8), channel(0), alpha],
+            )
+        }
+    })
+}
+
+/// One tick of `LivingEntity.tickEffects`' client branch: a one in four
+/// chance (one in fifteen while invisible, a fifth of either when all the
+/// effects are ambient) of one of the particles at a random spot of the box.
+fn swirl(
+    particles: &mut ParticleEngine,
+    feet: Vec3,
+    size: (f64, f64),
+    list: &[ParticleOptions],
+    ambient: bool,
+    invisible: bool,
+) {
+    if list.is_empty() {
+        return;
+    }
+    let bound = if invisible { 15 } else { 4 } * if ambient { 5 } else { 1 };
+    let r = particles.random();
+    let Ok(0) = r.next_int_bound(bound) else {
+        return;
+    };
+    // Util.getRandom, then getRandomX(0.5), getRandomY and getRandomZ.
+    let pick = r.next_int_bound(list.len() as i32).unwrap_or_default() as usize;
+    let x = feet.x + size.0 * (2.0 * r.next_double() - 1.0) * 0.5;
+    let y = feet.y + size.1 * r.next_double();
+    let z = feet.z + size.0 * (2.0 * r.next_double() - 1.0) * 0.5;
+    particles.add(&list[pick], [x, y, z], [1.0; 3]);
+}

crates/horizon-client/src/game/combat.rs

@@ -1,7 +1,16 @@
 //! The player's `CombatTracker`: the damage taken lately, who dealt it and
 //! where the player fell from, turned into the vanilla death message.
 use super::{Game, chat::PLAYER_NAME};
-use horizon_client::{health::HealthEvent, motion::MotionEvent, text::Text};
+use horizon_client::{
+    health::HealthEvent,
+    motion::MotionEvent,
+    particles::{ParticleOptions, ParticleType},
+    text::Text,
+};
+use horizon_core::random::RandomSource;
+
+/// `EntityEvent.DROWN_PARTICLES`: broadcast with the drowning damage.
+pub(super) const DROWN_EVENT: i8 = 67;
 
 struct Entry {
     damage_type: String,
@@ -10,6 +19,9 @@ struct Entry {
     fall_distance: f32,
     /// The causing entity: its id (for comparisons) and display name.
     attacker: Option<(u32, Text)>,
+    /// The direct entity's display name when no entity caused the damage
+    /// (`DamageSource.directEntity`: a potion with no thrower, a cloud).
+    direct: Option<Text>,
 }
 #[derive(Default)]
 pub(super) struct CombatTracker {
@@ -19,6 +31,8 @@ pub(super) struct CombatTracker {
     /// Attackers of damage dealt this tick, claimed by the matching
     /// `RecordedDamage` event.
     pending: Vec<(String, (u32, Text))>,
+    /// `pending` for a direct entity with no causing entity: only its name.
+    pending_direct: Vec<(String, Text)>,
     /// `LivingEntity.lastHurtByMob` and its timestamp (the kill credit).
     last_hurt_by: Option<((u32, Text), i64)>,
     /// The mob the player last hurt (`getLastHurtMob`) and when.
@@ -40,6 +54,38 @@ pub(super) struct CombatTracker {
     fall_before: f64,
 }
 impl Game<'_> {
+    /// `LivingEntity.makeDrownParticles`: eight bubbles around the entity,
+    /// moving with it.
+    pub(super) fn drown_particles(&mut self, at: [f64; 3], velocity: [f64; 3]) {
+        let bubble = ParticleOptions::simple(ParticleType::Bubble);
+        for _ in 0..8 {
+            let mut triangle = || {
+                let r = self.particles.random();
+                r.next_double() - r.next_double()
+            };
+            let p = [at[0] + triangle(), at[1] + triangle(), at[2] + triangle()];
+            self.particles.add(&bubble, p, velocity);
+        }
+    }
+    /// Entity event 67 from a server, for this client's own player or an
+    /// entity it draws.
+    pub(super) fn remote_drown(&mut self, id: i32) {
+        let own = self.remote.as_ref().is_some_and(|r| r.entity_id == id);
+        let body = if own {
+            self.player.as_ref().map(|p| {
+                let (at, v) = (p.position, p.velocity);
+                ([at.x, at.y, at.z], [v.x, v.y, v.z])
+            })
+        } else {
+            self.mobs.iter().find(|m| m.id == id as u32).map(|m| {
+                let (at, v) = (m.position, m.velocity);
+                ([at.x, at.y, at.z], [v.x, v.y, v.z])
+            })
+        };
+        if let Some((at, v)) = body {
+            self.drown_particles(at, v);
+        }
+    }
     /// The display name of a mob: its custom name or its type's name.
     pub(super) fn mob_display_name(&self, id: u32) -> Option<Text> {
         let m = self.mobs.iter().find(|m| m.id == id)?;
@@ -66,11 +112,19 @@ impl Game<'_> {
             .pending
             .push((damage_type.to_owned(), (id, name)));
     }
+    /// The `DamageSource.directEntity` of the next `damage_type` damage when
+    /// nothing caused it (a splash potion nobody threw): the death message
+    /// names it instead (`getLocalizedDeathMessage`). It is no kill credit.
+    pub(super) fn note_direct_entity(&mut self, damage_type: &str, name: Text) {
+        self.combat
+            .pending_direct
+            .push((damage_type.to_owned(), name));
+    }
     /// `LivingEntity.handleDamageEvent` for the player: the hurt sound of the
     /// source's `DamageEffects` (`Player.getHurtSound`).
     pub(super) fn player_hurt_sound(&mut self, sound: &str, at: [f64; 3]) {
-        let pitch = self.audio.hurt_pitch();
-        self.audio.play(sound, Some(at), 1.0, pitch);
+        // Player.getVoicePitch: always 1.0.
+        self.audio.play(sound, Some(at), 1.0, 1.0);
     }
     /// `CombatTracker.recordDamage` for the motion events of this tick.
     pub(super) fn record_combat(&mut self, events: &[MotionEvent]) {
@@ -94,6 +148,15 @@ impl Game<'_> {
                 .iter()
                 .position(|(t, _)| *t == name)
                 .map(|i| self.combat.pending.remove(i).1);
+            let direct = match attacker {
+                Some(_) => None,
+                None => self
+                    .combat
+                    .pending_direct
+                    .iter()
+                    .position(|(t, _)| *t == name)
+                    .map(|i| self.combat.pending_direct.remove(i).1),
+            };
             let (fall_location, fall_distance) = self.fall_location();
             let now = self.world.game_time;
             if let Some(a) = &attacker {
@@ -111,10 +174,12 @@ impl Game<'_> {
                 fall_location,
                 fall_distance,
                 attacker,
+                direct,
             });
             self.combat.last_damage = now;
         }
         self.combat.pending.clear();
+        self.combat.pending_direct.clear();
         self.combat.fall_before = self.player.as_ref().map_or(0.0, |p| p.fall_distance);
     }
     /// `FallLocation.getCurrentFallLocation` and the fall distance so far.
@@ -224,6 +289,7 @@ impl Game<'_> {
         let entries = std::mem::take(&mut self.combat.entries);
         let killing = entries.last().expect("checked above");
         let killer = killing.attacker.clone();
+        let direct = killing.direct.clone();
         if def.1 == "fall_variants"
             && let Some(knock) = knock.and_then(|i| entries.get(i))
         {
@@ -248,15 +314,22 @@ impl Game<'_> {
                 .append(Text::literal("]"));
             return Text::translate(&format!("{key}.message"), &[me, link]);
         }
+        // `getLocalizedDeathMessage`: the causing entity's name, or the
+        // direct entity's when nothing caused the damage.
         if let Some((_, name)) = killer {
             return Text::translate(&key, &[me, name]);
         }
+        if let Some(name) = direct {
+            return Text::translate(&key, &[me, name]);
+        }
         // getKillCredit: the last mob that hurt the player in the past 100 ticks.
         if let Some(((_, name), at)) = &self.combat.last_hurt_by
             && self.world.game_time - at <= 100
         {
             return Text::translate(&format!("{key}.player"), &[me, name.clone()]);
         }
+        // No entity at all: the one-argument message, as vanilla sends it (a
+        // template that names a killer then shows as written).
         Text::translate(&key, &[me])
     }
 }

crates/horizon-client/src/game/command_blocks.rs

@@ -2,7 +2,7 @@
 //! tick (`execute`, `executeChain`), `BaseCommandBlock.performCommand`
 //! through the command system with the block's output, and
 //! `CommandBlockEditScreen` with what `handleSetCommandBlock` does with it.
-use super::{Game, Screen, commands::execute::Source};
+use super::{Game, Screen, commands::execute::Source, lan::LanHost};
 use horizon_client::{
     command_block::{self, CommandBlock, Mode},
     containers::BlockEntity,
@@ -12,6 +12,7 @@ use horizon_client::{
     world::World,
 };
 use horizon_core::position::BlockPos;
+use horizon_protocol::packets::play::{self, Serverbound as S};
 use horizon_world::{
     chunk::BlockState,
     level::flags,
@@ -35,6 +36,16 @@ pub(super) struct CommandBlockScreen {
     auto: bool,
 }
 
+/// What `ServerboundSetCommandBlockPacket` carries.
+struct CommandBlockEdit {
+    pos: Pos,
+    command: String,
+    track_output: bool,
+    mode: Mode,
+    conditional: bool,
+    auto: bool,
+}
+
 #[derive(Clone, Copy, PartialEq)]
 enum Button {
     Output,
@@ -186,6 +197,18 @@ impl Game<'_> {
     pub(super) fn can_use_game_master_blocks(&self) -> bool {
         self.creative && self.ui.registries.permission >= 2
     }
+    /// `CommandBlock.useWithoutItem` on a server's client, which opens the
+    /// screen itself (`Player.openCommandBlock`) while the server only
+    /// answers the click: the block at `pos`, when it is a command block the
+    /// player may edit.
+    pub(super) fn open_command_block_if_editable(&mut self, pos: Pos) {
+        let is_command_block = self
+            .block_state_at(pos)
+            .is_some_and(|state| Mode::of_block(&state.name).is_some());
+        if is_command_block && self.can_use_game_master_blocks() {
+            self.open_command_block(pos);
+        }
+    }
     fn command_block(&self, pos: Pos) -> Option<&CommandBlock> {
         match self.world.block_entities.get(&pos)? {
             BlockEntity::CommandBlock(c) => Some(c),
@@ -572,12 +595,66 @@ impl Game<'_> {
             s.command.insert_text(&allowed);
         }
     }
-    /// `ServerGamePacketListenerImpl.handleSetCommandBlock`.
+    /// The edit screen's Done: a server's client sends the packet, the
+    /// window's own world applies it (`handleSetCommandBlock`).
     fn set_command_block(&mut self, s: &CommandBlockScreen) {
         if !self.can_use_game_master_blocks() {
             self.system_message(Text::translate("advMode.notAllowed", &[]));
             return;
         }
+        let edit = CommandBlockEdit {
+            pos: s.pos,
+            command: s.command.value.clone(),
+            track_output: s.track_output,
+            mode: s.mode,
+            conditional: s.conditional,
+            auto: s.auto,
+        };
+        if self.remote.is_some() {
+            self.send(S::SetCommandBlock(play::SetCommandBlock {
+                pos: [edit.pos.0, edit.pos.1, edit.pos.2],
+                command: edit.command,
+                mode: edit.mode.ordinal(),
+                flags: i8::from(edit.track_output)
+                    | (i8::from(edit.conditional) << 1)
+                    | (i8::from(edit.auto) << 2),
+            }));
+        } else {
+            self.apply_command_block(&edit);
+        }
+    }
+    /// `ServerGamePacketListenerImpl.handleSetCommandBlock` for a guest: the
+    /// block is edited only by a creative player with game master commands.
+    pub(super) fn lan_set_command_block(
+        &mut self,
+        host: &mut LanHost,
+        conn: u32,
+        p: play::SetCommandBlock,
+    ) {
+        let Some(g) = host.hub.guest(conn) else {
+            return;
+        };
+        let allowed = g.creative() && g.permission >= 2;
+        let edit = CommandBlockEdit {
+            pos: (p.pos[0], p.pos[1], p.pos[2]),
+            command: p.command,
+            track_output: p.flags & 1 != 0,
+            mode: Mode::from_ordinal(p.mode),
+            conditional: p.flags & 2 != 0,
+            auto: p.flags & 4 != 0,
+        };
+        self.as_guest(host, conn, |game| {
+            if allowed {
+                game.apply_command_block(&edit);
+                // BaseCommandBlock.onUpdated: the clients get the new command.
+                game.mark_block_entity_updated(edit.pos);
+            } else {
+                game.system_message(Text::translate("advMode.notAllowed", &[]));
+            }
+        });
+    }
+    /// What `handleSetCommandBlock` does once the player may edit the block.
+    fn apply_command_block(&mut self, s: &CommandBlockEdit) {
         let pos = s.pos;
         let registry = self.pack.assets.registry;
         let Some(current) = self.block_state_at(pos) else {
@@ -609,7 +686,7 @@ impl Game<'_> {
             }
             let _ = self.process_level_events();
         }
-        let command = s.command.value.clone();
+        let command = s.command.clone();
         let Some(c) = command_block_mut(&mut self.world, pos) else {
             return;
         };

crates/horizon-client/src/game/commands.rs

@@ -42,9 +42,10 @@ pub(super) enum Target {
     Guest(u32),
     Mob(u32),
     Item(u32),
-    Orb(usize),
-    /// By index in `creatures.projectiles`.
-    Projectile(usize),
+    /// An experience orb, by its entity id.
+    Orb(u32),
+    /// A projectile, by its entity id.
+    Projectile(u32),
     Stand(u32),
     Frame(u32),
     Painting(u32),
@@ -53,6 +54,10 @@ pub(super) enum Target {
     /// An entity of a type Horizon does not simulate (markers, displays,
     /// interactions...): kept as its saved data at a position.
     Other(u32),
+    /// An End crystal, by its entity id (`minecraft:end_crystal`).
+    Crystal(u32),
+    /// The Ender Dragon, by its entity id (`minecraft:ender_dragon`).
+    Dragon(u32),
 }
 /// An entity of a type Horizon does not simulate: its compound lives in the
 /// entity memory (`persist.raw`), its position and rotation here.
@@ -340,14 +345,16 @@ impl Game<'_> {
                 .iter()
                 .find(|i| i.id == id)
                 .map(|i| [i.position.x, i.position.y, i.position.z]),
-            Target::Orb(i) => self
+            Target::Orb(id) => self
                 .orbs
-                .get(i)
+                .iter()
+                .find(|o| o.id == id)
                 .map(|o| [o.position.x, o.position.y, o.position.z]),
-            Target::Projectile(i) => self
+            Target::Projectile(id) => self
                 .creatures
                 .projectiles
-                .get(i)
+                .iter()
+                .find(|a| a.id == id)
                 .map(|a| [a.position.x, a.position.y, a.position.z]),
             Target::Stand(id) => self
                 .armor_stands
@@ -385,6 +392,16 @@ impl Game<'_> {
                 .iter()
                 .find(|o| o.id == id)
                 .map(|o| [o.position.x, o.position.y, o.position.z]),
+            Target::Crystal(id) => self
+                .crystals
+                .iter()
+                .find(|c| c.id == id)
+                .map(|c| [c.position.x, c.position.y, c.position.z]),
+            Target::Dragon(id) => self
+                .dragon
+                .as_ref()
+                .filter(|d| d.id == id)
+                .map(|d| [d.position.x, d.position.y, d.position.z]),
         }
     }
     pub(super) fn target_type(&self, t: Target) -> String {
@@ -399,10 +416,11 @@ impl Game<'_> {
                 }),
             Target::Item(_) => "minecraft:item".into(),
             Target::Orb(_) => "minecraft:experience_orb".into(),
-            Target::Projectile(i) => self
+            Target::Projectile(id) => self
                 .creatures
                 .projectiles
-                .get(i)
+                .iter()
+                .find(|p| p.id == id)
                 .map_or_else(String::new, |p| p.kind.id().into()),
             Target::Stand(_) => "minecraft:armor_stand".into(),
             Target::Frame(id) => {
@@ -428,6 +446,8 @@ impl Game<'_> {
                 .iter()
                 .find(|o| o.id == id)
                 .map_or_else(String::new, |o| o.kind.clone()),
+            Target::Crystal(_) => "minecraft:end_crystal".into(),
+            Target::Dragon(_) => "minecraft:ender_dragon".into(),
         }
     }
     /// The name of the player the game acts for: a guest's own while their
@@ -512,51 +532,72 @@ impl Game<'_> {
                 s.pos[2].unwrap_or(p[2]),
             ]
         };
-        let mut candidates: Vec<Target> = Vec::new();
+        let mut source_candidates: Vec<Target> = Vec::new();
         match (s.kind, self.command_source) {
             // @s: the executing entity (none for a server source).
-            ('s', Some(source)) => candidates.extend(source.entity),
-            ('s', None) => candidates.extend(self.source_entity()),
+            ('s', Some(source)) => source_candidates.extend(source.entity),
+            ('s', None) => source_candidates.extend(self.source_entity()),
             // A guest in place is among the players, in join order.
             _ if self.player.is_some() && self.lan_acting.is_none() => {
-                candidates.push(Target::Player);
+                source_candidates.push(Target::Player);
             }
             _ => {}
         }
         if s.kind != 's' {
-            use horizon_client::projectiles::ProjectileKind as K;
-            candidates.extend(self.player_candidates(s));
-            candidates.extend(
-                self.mobs
-                    .iter()
-                    .filter(|m| m.death_time == 0)
-                    .map(|m| Target::Mob(m.id)),
-            );
-            candidates.extend(self.dropped.iter().map(|i| Target::Item(i.id)));
-            candidates.extend((0..self.orbs.len()).map(Target::Orb));
-            candidates.extend(
-                self.creatures
-                    .projectiles
-                    .iter()
-                    .enumerate()
-                    // The kinds /data can write (entity_nbt).
-                    .filter(|(_, p)| {
-                        p.arrow.is_some()
-                            || matches!(p.kind, K::LargeFireball { .. } | K::SmallFireball)
-                    })
-                    .map(|(i, _)| Target::Projectile(i)),
-            );
-            candidates.extend(self.armor_stands.iter().map(|a| Target::Stand(a.id)));
-            candidates.extend(self.item_frames.iter().map(|f| Target::Frame(f.id)));
-            candidates.extend(self.paintings.iter().map(|p| Target::Painting(p.id)));
-            candidates.extend(self.boats.iter().map(|b| Target::Boat(b.id)));
-            candidates.extend(self.carts.iter().map(|c| Target::Cart(c.id)));
-            candidates.extend(self.others.iter().map(|o| Target::Other(o.id)));
+            source_candidates.extend(self.player_candidates(s));
         }
+        let source_dim = self.dim;
+        // A selector with a spatial constraint reaches the level the command
+        // runs in only; an unbounded one reaches every loaded level
+        // (EntitySelector.findEntities).
+        let dims = if s.world_limited() {
+            vec![source_dim]
+        } else {
+            self.loaded_dims()
+        };
+        let mut out: Vec<(Target, f64)> = Vec::new();
+        for dim in dims {
+            let back = self.enter_command_level(dim);
+            let mut candidates = Vec::new();
+            if dim == source_dim {
+                candidates.append(&mut source_candidates);
+            }
+            if s.kind != 's' {
+                candidates.extend(self.level_candidates());
+            }
+            out.extend(self.select_in_level(candidates, s, origin));
+            if let Some(back) = back {
+                self.enter_command_level(back);
+            }
+        }
+        match s.sort {
+            Sort::Nearest => out.sort_by(|a, b| a.1.total_cmp(&b.1)),
+            Sort::Furthest => out.sort_by(|a, b| b.1.total_cmp(&a.1)),
+            Sort::Random => {
+                for i in (1..out.len()).rev() {
+                    let j = self.world.random.next_int_bound(i as i32 + 1).unwrap_or(0) as usize;
+                    out.swap(i, j);
+                }
+            }
+            Sort::Arbitrary => {}
+        }
+        out.into_iter()
+            .take(s.limit.max(1))
+            .map(|(t, _)| t)
+            .collect()
+    }
+    /// The candidates of the level in place that pass the selector
+    /// (EntitySelector.getPredicate).
+    fn select_in_level(
+        &mut self,
+        candidates: Vec<Target>,
+        s: &Selector,
+        origin: [f64; 3],
+    ) -> Vec<(Target, f64)> {
         let level = self.experience.level;
         let creative = self.creative;
         let passing = self.selector_extra_filter(&candidates, s);
-        let mut out: Vec<(Target, f64)> = candidates
+        candidates
             .into_iter()
             .filter_map(|t| {
                 let p = self.target_position(t)?;
@@ -628,23 +669,102 @@ impl Game<'_> {
                 }
                 Some((t, d2))
             })
-            .collect();
-        match s.sort {
-            Sort::Nearest => out.sort_by(|a, b| a.1.total_cmp(&b.1)),
-            Sort::Furthest => out.sort_by(|a, b| b.1.total_cmp(&a.1)),
-            Sort::Random => {
-                for i in (1..out.len()).rev() {
-                    let j = self.world.random.next_int_bound(i as i32 + 1).unwrap_or(0) as usize;
-                    out.swap(i, j);
-                }
-            }
-            Sort::Arbitrary => {}
-        }
-        out.into_iter()
-            .take(s.limit.max(1))
-            .map(|(t, _)| t)
             .collect()
     }
+    /// The entities of the level in place a selector can find.
+    fn level_candidates(&self) -> Vec<Target> {
+        use horizon_client::projectiles::ProjectileKind as K;
+        let mut candidates = Vec::new();
+        candidates.extend(
+            self.mobs
+                .iter()
+                .filter(|m| m.death_time == 0)
+                .map(|m| Target::Mob(m.id)),
+        );
+        candidates.extend(self.dropped.iter().map(|i| Target::Item(i.id)));
+        candidates.extend(self.orbs.iter().map(|o| Target::Orb(o.id)));
+        candidates.extend(
+            self.creatures
+                .projectiles
+                .iter()
+                // The kinds /data can write (entity_nbt).
+                .filter(|p| {
+                    p.is_arrow() || matches!(p.kind, K::LargeFireball { .. } | K::SmallFireball)
+                })
+                .map(|p| Target::Projectile(p.id)),
+        );
+        candidates.extend(self.armor_stands.iter().map(|a| Target::Stand(a.id)));
+        candidates.extend(self.item_frames.iter().map(|f| Target::Frame(f.id)));
+        candidates.extend(self.paintings.iter().map(|p| Target::Painting(p.id)));
+        candidates.extend(self.boats.iter().map(|b| Target::Boat(b.id)));
+        candidates.extend(self.carts.iter().map(|c| Target::Cart(c.id)));
+        candidates.extend(self.others.iter().map(|o| Target::Other(o.id)));
+        // The End crystals and the dragon (EndCrystal and EnderDragon
+        // are entities of their own).
+        candidates.extend(self.crystals.iter().map(|c| Target::Crystal(c.id)));
+        if let Some(d) = &self.dragon {
+            candidates.push(Target::Dragon(d.id));
+        }
+        candidates
+    }
+    /// The loaded levels, in the order the server holds them: the
+    /// overworld, the nether, the end (MinecraftServer.getAllLevels).
+    fn loaded_dims(&self) -> Vec<Dim> {
+        let mut dims = vec![self.dim];
+        dims.extend(self.levels.parked_dims());
+        dims.sort_by_key(|d| match d {
+            Dim::Overworld => 0,
+            Dim::Nether => 1,
+            Dim::End => 2,
+        });
+        dims
+    }
+    /// Whether the level in place holds the entity a target names.
+    fn level_holds(&self, t: Target) -> bool {
+        match t {
+            // A player is in no level of its own.
+            Target::Player | Target::Guest(_) => true,
+            Target::Mob(id) => self.mobs.iter().any(|m| m.id == id),
+            Target::Item(id) => self.dropped.iter().any(|i| i.id == id),
+            Target::Orb(id) => self.orbs.iter().any(|o| o.id == id),
+            Target::Projectile(id) => self.creatures.projectiles.iter().any(|p| p.id == id),
+            Target::Stand(id) => self.armor_stands.iter().any(|a| a.id == id),
+            Target::Frame(id) => self.item_frames.iter().any(|f| f.id == id),
+            Target::Painting(id) => self.paintings.iter().any(|p| p.id == id),
+            Target::Boat(id) => self.boats.iter().any(|b| b.id == id),
+            Target::Cart(id) => self.carts.iter().any(|c| c.id == id),
+            Target::Other(id) => self.others.iter().any(|o| o.id == id),
+            Target::Crystal(id) => self.crystals.iter().any(|c| c.id == id),
+            Target::Dragon(id) => self.dragon.as_ref().is_some_and(|d| d.id == id),
+        }
+    }
+    /// Run `f` with the level that holds the entity a target names in place
+    /// (the entity ids are unique across the loaded levels) and put the
+    /// level back afterwards. `f` does not run when no level holds the
+    /// entity.
+    pub(in crate::game) fn in_target_level<R>(
+        &mut self,
+        t: Target,
+        f: impl FnOnce(&mut Self) -> R,
+    ) -> Option<R> {
+        if self.level_holds(t) {
+            return Some(f(self));
+        }
+        for dim in self.levels.parked_dims() {
+            let back = self.enter_command_level(dim);
+            if self.level_holds(t) {
+                let r = f(self);
+                if let Some(back) = back {
+                    self.enter_command_level(back);
+                }
+                return Some(r);
+            }
+            if let Some(back) = back {
+                self.enter_command_level(back);
+            }
+        }
+        None
+    }
     fn entity_tag_matches(&self, tag: &str, ty: &str) -> bool {
         let path = self.options.resources.join(format!(
             "data/minecraft/tags/entity_type/{}.json",
@@ -1104,6 +1224,10 @@ impl Game<'_> {
         Ok(targets.len() as i32)
     }
     fn teleport_to(&mut self, t: Target, pos: [f64; 3], rotation: Option<[f32; 2]>) {
+        // An entity in another level is teleported in the level that holds it.
+        let _ = self.in_target_level(t, |g| g.teleport_to_in_level(t, pos, rotation));
+    }
+    fn teleport_to_in_level(&mut self, t: Target, pos: [f64; 3], rotation: Option<[f32; 2]>) {
         let v = Vec3::new(pos[0], pos[1], pos[2]);
         match t {
             Target::Guest(_) => {
@@ -1152,14 +1276,14 @@ impl Game<'_> {
                     i.previous = v;
                 }
             }
-            Target::Orb(i) => {
-                if let Some(o) = self.orbs.get_mut(i) {
+            Target::Orb(id) => {
+                if let Some(o) = self.orbs.iter_mut().find(|o| o.id == id) {
                     o.position = v;
                     o.previous = v;
                 }
             }
-            Target::Projectile(i) => {
-                if let Some(a) = self.creatures.projectiles.get_mut(i) {
+            Target::Projectile(id) => {
+                if let Some(a) = self.creatures.projectiles.iter_mut().find(|a| a.id == id) {
                     a.position = v;
                     a.previous = v;
                 }
@@ -1199,6 +1323,17 @@ impl Game<'_> {
                     }
                 }
             }
+            Target::Crystal(id) => {
+                if let Some(c) = self.crystals.iter_mut().find(|c| c.id == id) {
+                    c.position = v;
+                }
+            }
+            Target::Dragon(id) => {
+                if let Some(d) = self.dragon.as_mut().filter(|d| d.id == id) {
+                    d.position = v;
+                    d.previous = v;
+                }
+            }
             // Wall-mounted entities do not move.
             Target::Frame(_) | Target::Painting(_) => {}
         }
@@ -1558,6 +1693,10 @@ impl Game<'_> {
         Ok(duration.unwrap_or(-1))
     }
     fn kill_target(&mut self, t: Target) {
+        // An entity in another level is killed in the level that holds it.
+        let _ = self.in_target_level(t, |g| g.kill_target_in_level(t));
+    }
+    fn kill_target_in_level(&mut self, t: Target) {
         match t {
             Target::Guest(_) => {
                 self.for_player(t, |g| g.kill_target(Target::Player));
@@ -1577,16 +1716,13 @@ impl Game<'_> {
                 }
             }
             Target::Item(id) => self.dropped.retain(|i| i.id != id),
-            Target::Orb(i) => {
-                if i < self.orbs.len() {
-                    self.orbs[i].age = u32::MAX / 2;
+            Target::Orb(id) => {
+                if let Some(o) = self.orbs.iter_mut().find(|o| o.id == id) {
+                    o.age = u32::MAX / 2;
                 }
             }
-            // cmd_kill goes from the highest index down.
-            Target::Projectile(i) => {
-                if i < self.creatures.projectiles.len() {
-                    self.creatures.projectiles.remove(i);
-                }
+            Target::Projectile(id) => {
+                self.creatures.projectiles.retain(|p| p.id != id);
             }
             Target::Stand(id) => self.armor_stands.retain(|a| a.id != id),
             Target::Frame(id) => self.item_frames.retain(|f| f.id != id),
@@ -1594,7 +1730,11 @@ impl Game<'_> {
             Target::Boat(id) => self.boats.retain(|b| b.id != id),
             Target::Cart(id) => self.carts.retain(|c| c.id != id),
             Target::Other(id) => self.others.retain(|o| o.id != id),
+            Target::Crystal(id) => self.kill_crystal(id),
+            Target::Dragon(id) => self.kill_dragon(id),
         }
+        // The orbs marked for removal are gone (Entity.kill removes them).
+        self.orbs.retain(|o| o.age < u32::MAX / 2);
     }
     fn cmd_kill(&mut self, ctx: &Context) -> R<i32> {
         let targets = if ctx.get("targets").is_some() {
@@ -1602,19 +1742,18 @@ impl Game<'_> {
         } else {
             vec![self.implied_player()]
         };
-        let names: Vec<Text> = targets.iter().map(|&t| self.target_name(t)).collect();
-        // Remove indexed entities from the back so earlier indices stay valid.
-        let mut ordered = targets.clone();
-        ordered.sort_by_key(|t| {
-            std::cmp::Reverse(match t {
-                Target::Orb(i) | Target::Projectile(i) => *i,
-                _ => 0,
-            })
-        });
-        for t in ordered {
+        let mut names: Vec<Text> = Vec::new();
+        for &t in &targets {
+            // The name of an entity in another level is read there.
+            let name = match self.in_target_level(t, |g| g.target_name(t)) {
+                Some(name) => name,
+                None => self.target_name(t),
+            };
+            names.push(name);
+        }
+        for &t in &targets {
             self.kill_target(t);
         }
-        self.orbs.retain(|o| o.age < u32::MAX / 2);
         let message = if targets.len() == 1 {
             Text::translate("commands.kill.success.single", &[names[0].clone()])
         } else {
@@ -1706,6 +1845,20 @@ impl Game<'_> {
                     self.spawn_bolt(pos, false);
                     name = Text::translate("entity.minecraft.lightning_bolt", &[]);
                 }
+                "end_crystal" => {
+                    // EndCrystal's constructor takes an id from the entity
+                    // counter, and the crystal is shown with its base.
+                    self.next_entity += 1;
+                    self.crystals.push(super::dragon::Crystal {
+                        id: self.next_entity,
+                        position: Vec3::new(pos[0], pos[1], pos[2]),
+                        show_bottom: true,
+                        time: self.world.random.next_int_bound(100_000).unwrap_or(0),
+                        beam: None,
+                        invulnerable: false,
+                    });
+                    name = Text::translate("entity.minecraft.end_crystal", &[]);
+                }
                 k if super::minecarts::CartKind::from_id(&kind).is_some() => {
                     let cart_kind = super::minecarts::CartKind::from_id(&kind)
                         .unwrap_or(super::minecarts::CartKind::Rideable);

crates/horizon-client/src/game/commands/data.rs

@@ -31,8 +31,13 @@ fn set_key(tag: &mut Tag, key: &str, value: Tag) {
 impl Game<'_> {
     // ---- entity data ---------------------------------------------------
 
-    /// `NbtPredicate.getEntityTagToCompare`: the entity as saved.
+    /// `NbtPredicate.getEntityTagToCompare`: the entity as saved. An entity
+    /// in another level is read in the level that holds it.
     pub(in crate::game) fn entity_nbt(&mut self, t: Target) -> Option<Tag> {
+        self.in_target_level(t, |g| g.entity_nbt_in_level(t))
+            .flatten()
+    }
+    fn entity_nbt_in_level(&mut self, t: Target) -> Option<Tag> {
         let player_uuid = self.level.player_uuid;
         Some(match t {
             Target::Guest(_) => {
@@ -113,9 +118,11 @@ impl Game<'_> {
                 let o = self.others.iter().find(|o| o.id == id)?.clone();
                 self.other_to_nbt(&o, uuid)
             }
-            Target::Orb(i) => entity_nbt::orb_to_nbt(self.orbs.get(i)?, random_uuid()),
-            Target::Projectile(i) => {
-                let p = self.creatures.projectiles.get(i)?;
+            Target::Orb(id) => {
+                entity_nbt::orb_to_nbt(self.orbs.iter().find(|o| o.id == id)?, random_uuid())
+            }
+            Target::Projectile(id) => {
+                let p = self.creatures.projectiles.iter().find(|p| p.id == id)?;
                 let owner = if p.owner == Some(horizon_client::mobs::Who::Player) {
                     player_uuid
                 } else {
@@ -129,6 +136,16 @@ impl Game<'_> {
                 entity_nbt::arrow_to_nbt(p, random_uuid(), owner, in_block, None)
                     .or_else(|| entity_nbt::fireball_to_nbt(p, random_uuid(), owner, None))?
             }
+            Target::Crystal(id) => {
+                let c = self.crystals.iter().find(|c| c.id == id)?;
+                let (uuid, raw) = self.persist_anon("minecraft:end_crystal", c.position);
+                c.to_nbt(uuid.unwrap_or_else(random_uuid), raw)
+            }
+            Target::Dragon(id) => {
+                let d = self.dragon.as_ref().filter(|d| d.id == id)?;
+                let (uuid, raw) = self.persist_anon("minecraft:ender_dragon", d.position);
+                d.to_nbt(uuid.unwrap_or_else(random_uuid), raw)
+            }
         })
     }
     /// `Entity.load` of new data (`EntityDataAccessor.setData`): the entity is
@@ -397,6 +414,19 @@ impl Game<'_> {
     }
     pub(super) fn cmd_data(&mut self, id: &str, ctx: &Context) -> R<i32> {
         let target = self.data_ref(ctx, 0)?;
+        // An entity in another level is read and written in the level that
+        // holds it.
+        if let DataRef::Entity(t) = &target {
+            let t = *t;
+            let target = target.clone();
+            return match self.in_target_level(t, |g| g.cmd_data_in(id, ctx, target)) {
+                Some(r) => r,
+                None => Err(err("argument.entity.notfound.entity", &[])),
+            };
+        }
+        self.cmd_data_in(id, ctx, target)
+    }
+    fn cmd_data_in(&mut self, id: &str, ctx: &Context, target: DataRef) -> R<i32> {
         match id {
             "data.merge" => {
                 let Some(Arg::Str(nbt)) = ctx.get("nbt") else {

crates/horizon-client/src/game/commands/effects.rs

@@ -1,11 +1,10 @@
 //! `/effect` (EffectCommands) and `/enchant` (EnchantCommand).
 use super::{Arg, Context, Game, R, Target, err, texts};
 use horizon_client::{
-    brewing,
+    brewing::{self, namespaced},
     effects::EffectInstance,
     text::{self, Style, Text},
 };
-use std::{collections::HashMap, sync::OnceLock};
 
 /// `CommandResponseTracker` over targets: elements with a non-zero result.
 #[derive(Default)]
@@ -21,24 +20,6 @@ impl Tracker {
         }
     }
 }
-/// Namespaced effect ids for mob effect storage.
-fn namespaced(id: &'static str) -> &'static str {
-    static IDS: OnceLock<HashMap<&'static str, &'static str>> = OnceLock::new();
-    IDS.get_or_init(|| {
-        brewing::EFFECTS
-            .iter()
-            .map(|e| {
-                (
-                    e.id,
-                    &*Box::leak(format!("minecraft:{}", e.id).into_boxed_str()),
-                )
-            })
-            .collect()
-    })
-    .get(id)
-    .copied()
-    .unwrap_or(id)
-}
 fn effect_name(id: &str) -> Text {
     Text::translate(&format!("effect.minecraft.{id}"), &[])
 }
@@ -91,7 +72,12 @@ impl Game<'_> {
                 }
                 Target::Mob(id) => match self.mobs.iter_mut().find(|m| m.id == id) {
                     Some(m) => {
-                        m.add_effect(namespaced(effect.id), duration, amplifier);
+                        let name = namespaced(effect.id);
+                        m.add_effect(name, duration, amplifier);
+                        m.extra.hidden_effects.retain(|h| *h != name);
+                        if !particles {
+                            m.extra.hidden_effects.push(name);
+                        }
                         true
                     }
                     None => false,
@@ -154,6 +140,10 @@ impl Game<'_> {
                         m.extra
                             .effects
                             .retain(|x| e.is_some_and(|e| x.0 != namespaced(e.id)));
+                        let left = &m.extra.effects;
+                        m.extra
+                            .hidden_effects
+                            .retain(|h| left.iter().any(|x| x.0 == *h));
                         m.extra.effects.len() != before
                     }
                     None => false,

crates/horizon-client/src/game/commands/execute.rs

@@ -145,9 +145,42 @@ impl Game<'_> {
                 .iter()
                 .find(|m| m.id == id)
                 .map_or(0.0, |m| m.eye_y() - m.position.y),
-            _ => 0.0,
+            // ArmorStand.getDefaultDimensions: a marker's are empty, a small
+            // stand's are BABY_DIMENSIONS, whose eye height is 0.9875F.
+            Target::Stand(id) => match self.armor_stands.iter().find(|a| a.id == id) {
+                Some(a) if a.marker => 0.0,
+                Some(a) if a.small => f64::from(0.9875f32),
+                _ => self.type_eye_height(&self.target_type(t)),
+            },
+            // Entity.getEyeHeight: the type's dimensions.
+            _ => self.type_eye_height(&self.target_type(t)),
         }
     }
+    /// `EntityType.getDimensions().eyeHeight()` from `entity-types.json`,
+    /// read once: a float, widened as `Entity.getEyeY` does.
+    fn type_eye_height(&self, ty: &str) -> f64 {
+        static EYE_HEIGHTS: std::sync::OnceLock<std::collections::HashMap<String, f64>> =
+            std::sync::OnceLock::new();
+        EYE_HEIGHTS
+            .get_or_init(|| {
+                std::fs::read(self.options.resources.join("entity-types.json"))
+                    .ok()
+                    .and_then(|b| serde_json::from_slice::<serde_json::Value>(&b).ok())
+                    .and_then(|v| {
+                        v.as_object().map(|o| {
+                            o.iter()
+                                .filter_map(|(k, t)| {
+                                    Some((k.clone(), f64::from(t["eye_height"].as_f64()? as f32)))
+                                })
+                                .collect()
+                        })
+                    })
+                    .unwrap_or_default()
+            })
+            .get(ty)
+            .copied()
+            .unwrap_or(0.0)
+    }
     /// EntityAnchorArgument.Anchor.apply.
     pub(super) fn anchor_position(&self, s: &Source) -> [f64; 3] {
         match s.entity {
@@ -467,9 +500,10 @@ impl Game<'_> {
             "positioned" if c.has("as") => targets(self)?
                 .into_iter()
                 .filter_map(|t| {
+                    // withPosition keeps the anchor (only `positioned <pos>`
+                    // resets it to the feet).
                     Some(Source {
                         pos: self.target_position(t)?,
-                        eyes: false,
                         ..s
                     })
                 })
@@ -606,6 +640,73 @@ impl Game<'_> {
                     .collect(),
                 _ => Vec::new(),
             },
+            // Leashable.getLeashHolder: a fence knot is not an entity here.
+            Some("leasher") => match entity {
+                Target::Mob(id) => self
+                    .mobs
+                    .iter()
+                    .find(|m| m.id == id)
+                    .and_then(|m| m.extra.leash.map(|holder| (holder, m.extra.leash_player)))
+                    .and_then(|(holder, player)| match holder {
+                        // The player who tied it (the host's when unrecorded).
+                        horizon_client::mobs::leash::Holder::Player => {
+                            let uuid = player.or(self.level.player_uuid)?;
+                            self.target_by_uuid(horizon_client::lan::playerdata::ints_uuid(uuid))
+                        }
+                        horizon_client::mobs::leash::Holder::Mob(i) => Some(Target::Mob(i)),
+                        horizon_client::mobs::leash::Holder::Knot(_) => None,
+                    })
+                    .into_iter()
+                    .collect(),
+                _ => Vec::new(),
+            },
+            // TraceableEntity.getOwner: who shot a projectile, who threw an
+            // item, who summoned a vex.
+            Some("origin") => match entity {
+                Target::Projectile(id) => self
+                    .creatures
+                    .projectiles
+                    .iter()
+                    .find(|p| p.id == id)
+                    .and_then(|p| match (p.owner?, p.guest) {
+                        // A guest's shot: `Who::Player` is them.
+                        (horizon_client::mobs::Who::Player, Some(conn))
+                            if self.lan_acting == Some(conn) =>
+                        {
+                            Some(Target::Player)
+                        }
+                        (horizon_client::mobs::Who::Player, Some(conn)) => {
+                            Some(Target::Guest(conn))
+                        }
+                        (horizon_client::mobs::Who::Player, None) => Some(Target::Player),
+                        (horizon_client::mobs::Who::Mob(id), _) => Some(Target::Mob(id)),
+                    })
+                    .into_iter()
+                    .collect(),
+                Target::Item(id) => self
+                    .dropped
+                    .iter()
+                    .find(|d| d.id == id)
+                    .and_then(|d| d.thrower)
+                    .and_then(|words| {
+                        let uuid = words
+                            .iter()
+                            .fold(0u128, |all, w| all << 32 | u128::from(*w as u32));
+                        self.target_by_uuid(uuid)
+                    })
+                    .into_iter()
+                    .collect(),
+                Target::Mob(id) => self
+                    .mobs
+                    .iter()
+                    .find(|m| m.id == id && m.kind.id == "minecraft:vex")
+                    .map(|m| m.extra.counter2 as u32)
+                    .filter(|owner| *owner != 0)
+                    .map(Target::Mob)
+                    .into_iter()
+                    .collect(),
+                _ => Vec::new(),
+            },
             Some("vehicle") => self.ride_vehicle(entity).into_iter().collect(),
             Some("controller") | Some("passengers") => match entity {
                 Target::Mob(id) if self.mobs.iter().any(|m| m.id == id && m.rider.is_some()) => {
@@ -807,10 +908,12 @@ impl Game<'_> {
                 .coords(c, "pos")
                 .map(|co| co.block(self.source_position(), self.source_rotation()));
             let dimension = self.command_source.map_or(self.dim, |s| s.dimension);
-            return Ok(flag(
-                dimension == self.dim
-                    && p.is_some_and(|p| self.world.chunks.contains_key(&(p[0] >> 4, p[2] >> 4))),
-            ));
+            // ExecuteCommand.isChunkLoaded: ENTITY_TICKING, which is past lit.
+            let loaded = |p: [i32; 3]| {
+                let key = (p[0] >> 4, p[2] >> 4);
+                self.world.chunks.contains_key(&key) && self.streaming.is_lit(key.0, key.1)
+            };
+            return Ok(flag(dimension == self.dim && p.is_some_and(loaded)));
         }
         if c.has("dimension") {
             let dimension = self.command_source.map_or(self.dim, |s| s.dimension);

crates/horizon-client/src/game/commands/pregen.rs

@@ -244,7 +244,11 @@ impl Game<'_> {
     /// hand them the next jobs as soon as each one is done, rather than once
     /// a tick.
     pub(in crate::game) fn pump_pregen(&mut self, until: Instant) {
-        while self.pregen_runs_here() {
+        // Force-loaded chunks too: decorating in vanilla's order, a chunk
+        // waits for its neighbours far more often than once a tick allows.
+        while self.pregen_runs_here()
+            || (!self.streaming.forced.is_empty() && self.streaming.busy())
+        {
             let now = Instant::now();
             if now >= until {
                 break;

crates/horizon-client/src/game/commands/terrain_cmds.rs

@@ -120,6 +120,9 @@ impl Game<'_> {
                         tracker.track(&holder(chunk_text(x, z)), i32::from(changed));
                     }
                 }
+                if add {
+                    self.streaming.rank_forced(cx0, cz0, cx1, cz1);
+                }
                 let (lo, hi) = (chunk_text(cx0, cz0), chunk_text(cx1, cz1));
                 let verb = if add { "added" } else { "removed" };
                 let (message, total) = tracker.message(

crates/horizon-client/src/game/commands/text_commands.rs

@@ -14,10 +14,11 @@ impl Game<'_> {
             serde_json::from_str(json).map_err(|e| err("argument.component.invalid", &[&e]))?;
         // NbtContents.resolve: the path's values in the entity, block or
         // storage data, rich-styled (or plain, or interpreted), ", "-joined.
+        // ScoreContents.resolve: the holder's score in the objective.
         let nbt_values = std::cell::RefCell::new(Vec::new());
         {
             let mut collect = |o: &serde_json::Map<String, serde_json::Value>| {
-                if o.contains_key("nbt") {
+                if o.contains_key("nbt") || o.contains_key("score") {
                     nbt_values.borrow_mut().push(o.clone());
                 }
             };
@@ -40,7 +41,11 @@ impl Game<'_> {
         }
         let mut resolved: Vec<(serde_json::Map<String, serde_json::Value>, Text)> = Vec::new();
         for o in nbt_values.into_inner() {
-            let t = self.resolve_nbt_component(&o);
+            let t = if o.contains_key("score") {
+                self.resolve_score_component(&o)?
+            } else {
+                self.resolve_nbt_component(&o)
+            };
             resolved.push((o, t));
         }
         let mut resolve = |raw: &str| -> Text {
@@ -73,6 +78,54 @@ impl Game<'_> {
             },
         ))
     }
+    /// The text of a `score` component (ScoreContents.resolve): the named
+    /// holder's score, `*` being the player the command runs for.
+    fn resolve_score_component(
+        &mut self,
+        o: &serde_json::Map<String, serde_json::Value>,
+    ) -> R<Text> {
+        let score = o.get("score");
+        let field = |k: &str| score.and_then(|s| s.get(k)).and_then(|v| v.as_str());
+        let (name, objective) = (
+            field("name").unwrap_or(""),
+            field("objective").unwrap_or(""),
+        );
+        // findTargetName: a selector that matches one entity is that entity,
+        // one that matches none is just the name.
+        let mut reader = horizon_client::command::Reader::new(name);
+        let ty = horizon_client::command::args::ArgType::Entity {
+            single: false,
+            players: false,
+        };
+        let mut holder = name.to_owned();
+        if let Ok(Arg::Entity(sel)) = ty.parse(&mut reader, &self.ui.registries)
+            && !reader.can_read()
+        {
+            let found = self.select(&sel);
+            if found.len() > 1 {
+                return Err(err("argument.entity.toomany", &[]));
+            }
+            if let Some(t) = found.first().and_then(|t| self.holder_name(*t)) {
+                holder = t;
+            }
+        }
+        if holder == "*" {
+            holder = self.acting_player_name().to_owned();
+        }
+        let board = &self.score.board;
+        let (Some(objective), Some(score)) =
+            (board.objective(objective), board.score(&holder, objective))
+        else {
+            return Ok(Text::empty());
+        };
+        // numberFormatOrDefault(StyledFormat.NO_STYLE).
+        let format = (score.number_format.clone())
+            .or_else(|| objective.number_format.clone())
+            .unwrap_or(horizon_client::scoreboard::NumberFormat::Styled(
+                serde_json::json!({}),
+            ));
+        Ok(format.format(score.value))
+    }
     /// The text of an `nbt` component.
     fn resolve_nbt_component(&mut self, o: &serde_json::Map<String, serde_json::Value>) -> Text {
         use horizon_world::nbt::Tag;
@@ -136,28 +189,40 @@ impl Game<'_> {
         }
         out
     }
-    fn player_targets(&mut self, ctx: &Context) -> R<usize> {
-        // Only the local player can receive messages and titles.
+    /// The players the command reaches: the window's own and the LAN guests.
+    fn player_targets(&mut self, ctx: &Context) -> R<Vec<Target>> {
         let targets = self.entities(ctx, "targets", true)?;
-        Ok(targets.iter().filter(|t| **t == Target::Player).count())
+        Ok(targets
+            .into_iter()
+            .filter(|t| matches!(t, Target::Player | Target::Guest(_)))
+            .collect())
     }
     pub(super) fn cmd_tellraw(&mut self, ctx: &Context) -> R<i32> {
-        let n = self.player_targets(ctx)?;
+        let players = self.player_targets(ctx)?;
         let message = self.component_arg(ctx, "message")?;
-        if n > 0 {
-            self.system_message(message);
+        // Each player's chat (a guest's through the connection).
+        for &t in &players {
+            self.for_player(t, |g| g.system_message(message.clone()));
         }
-        Ok(n as i32)
+        Ok(players.len() as i32)
     }
     pub(super) fn cmd_title(&mut self, ctx: &Context) -> R<i32> {
-        let n = self.player_targets(ctx)?;
-        let name = self.target_name(Target::Player);
+        let players = self.player_targets(ctx)?;
+        let n = players.len();
+        let name = players
+            .first()
+            .map_or_else(Text::empty, |t| self.target_name(*t));
         let single = n == 1;
         let key = if ctx.has("clear") {
-            self.titles_or_packet(Titles::clear, C::ClearTitles(play::Bool1 { value: false }));
+            self.titles_or_packet(
+                &players,
+                Titles::clear,
+                C::ClearTitles(play::Bool1 { value: false }),
+            );
             "cleared"
         } else if ctx.has("reset") {
             self.titles_or_packet(
+                &players,
                 |t| {
                     t.clear();
                     t.reset_times();
@@ -172,6 +237,7 @@ impl Game<'_> {
             };
             let (fade_in, stay, fade_out) = (get("fadeIn"), get("stay"), get("fadeOut"));
             self.titles_or_packet(
+                &players,
                 |t| t.set_times(fade_in, stay, fade_out),
                 C::SetTitlesAnimation(play::TitlesAnimation {
                     fade_in,
@@ -186,13 +252,17 @@ impl Game<'_> {
                 text: component_nbt(&text.component()),
             };
             if ctx.has("subtitle") {
-                self.titles_or_packet(|t| t.set_subtitle(text), C::SetSubtitleText(sent));
+                self.titles_or_packet(&players, |t| t.set_subtitle(text), C::SetSubtitleText(sent));
                 "show.subtitle"
             } else if ctx.has("actionbar") {
-                self.titles_or_packet(|t| t.set_overlay(text, false), C::SetActionBarText(sent));
+                self.titles_or_packet(
+                    &players,
+                    |t| t.set_overlay(text, false),
+                    C::SetActionBarText(sent),
+                );
                 "show.actionbar"
             } else {
-                self.titles_or_packet(|t| t.set_title(text), C::SetTitleText(sent));
+                self.titles_or_packet(&players, |t| t.set_title(text), C::SetTitleText(sent));
                 "show.title"
             }
         };
@@ -207,13 +277,27 @@ impl Game<'_> {
         self.feedback(message);
         Ok(n as i32)
     }
-    /// The player the title is for: the guest acting now is sent the packet
-    /// (TitleCommand's `connection.send`), the window's own player shows it.
-    fn titles_or_packet(&mut self, local: impl FnOnce(&mut Titles), packet: C) {
-        if self.lan_acting.is_some() {
-            self.guest_packets.push(packet);
-        } else {
-            local(&mut self.titles);
+    /// TitleCommand's `connection.send` for each player: a guest is sent the
+    /// packet, the window's own player shows it.
+    fn titles_or_packet(&mut self, players: &[Target], local: impl FnOnce(&mut Titles), packet: C) {
+        let mut local = Some(local);
+        for &t in players {
+            match t {
+                Target::Player if self.lan_acting.is_some() => {
+                    self.guest_packets.push(packet.clone());
+                }
+                Target::Player => {
+                    if let Some(local) = local.take() {
+                        local(&mut self.titles);
+                    }
+                }
+                Target::Guest(conn) => {
+                    if let Some(host) = self.lan.as_ref() {
+                        host.hub.send_to(conn, &packet);
+                    }
+                }
+                _ => {}
+            }
         }
     }
 }

crates/horizon-client/src/game/commands/world_cmds.rs

@@ -115,9 +115,11 @@ impl Game<'_> {
             "in_fire" | "campfire" | "hot_floor" => DamageKind::InFire,
             "lava" => DamageKind::Lava,
             "drown" => DamageKind::Drown,
+            "dry_out" => DamageKind::DryOut,
             "magic" | "indirect_magic" | "dragon_breath" => DamageKind::Magic,
             "sting" => DamageKind::Sting,
             "cactus" | "sweet_berry_bush" => DamageKind::Cactus,
+            "freeze" => DamageKind::Freeze,
             "in_wall" => DamageKind::InWall,
             "thorns" => DamageKind::Thorns,
             _ => DamageKind::Generic,
@@ -140,27 +142,37 @@ impl Game<'_> {
             Some(Arg::Entity(_)) => self.entities(ctx, "entity", false)?.first().copied(),
             _ => None,
         };
+        let cause = match ctx.get("cause") {
+            Some(Arg::Entity(_)) => self.entities(ctx, "cause", false)?.first().copied(),
+            _ => None,
+        };
         let from = match ctx.get("location") {
             Some(Arg::Coords(_)) => self.position_arg(ctx, "location"),
             _ => by.and_then(|t| self.target_position(t)),
         };
         let hurt = match target {
+            // The causing mob is the one the hit is credited to and thorns
+            // answer; the source position gives the knockback its direction.
             Target::Player => {
-                if self.creative || self.spectator() {
+                // `DamageSource(type, cause, by)`: the death message names the
+                // causing entity, else the direct one. A mob is noted by
+                // `hurt_player_from`, a player here.
+                if let Some(t @ (Target::Player | Target::Guest(_))) = cause.or(by) {
+                    let name = self.target_name(t);
+                    self.note_direct_entity(&ty, name);
+                }
+                if self.spectator() {
                     false
-                } else if let Some(player) = self.player.as_mut() {
-                    match self.motion.health.damage.id(&ty) {
-                        Some(id) => player
-                            .hurt(&self.motion.health, self.world.health_rules, id, amount)
-                            .unwrap_or(false),
-                        None => false,
-                    }
                 } else {
-                    false
+                    let attacker = match cause.or(by) {
+                        Some(Target::Mob(i)) => Some(Some(i)),
+                        _ => Some(None),
+                    };
+                    self.hurt_player_from(amount, from, &ty, attacker)
                 }
             }
             Target::Mob(id) => {
-                let attacker = by.and_then(|t| match t {
+                let attacker = cause.or(by).and_then(|t| match t {
                     Target::Player => Some(Who::Player),
                     Target::Mob(i) => Some(Who::Mob(i)),
                     _ => None,
@@ -301,9 +313,18 @@ impl Game<'_> {
             float("minVolume", 0.0),
         );
         let range = if volume > 1.0 { 16.0 * volume } else { 16.0 };
+        // PlaySoundCommand: one seed for every player.
+        let seed = self.world.random.next_long();
+        let here = self.dim.id();
         let mut tracker = Tracker::default();
         for t in targets {
-            if t != Target::Player {
+            if !matches!(t, Target::Player | Target::Guest(_)) {
+                continue;
+            }
+            // Only players in the source's level hear it.
+            if let Target::Guest(conn) = t
+                && self.command_guest(conn).is_none_or(|g| g.dimension != here)
+            {
                 continue;
             }
             let Some(p) = self.target_position(t) else {
@@ -327,8 +348,26 @@ impl Game<'_> {
             } else {
                 (pos, volume)
             };
-            self.audio.play_on(source, &sound, Some(at), v, pitch);
-            tracker.mark(&holder(Text::literal(self.acting_player_name())));
+            // The connection is sent the sound; the window's own player
+            // plays it.
+            let guest = match t {
+                Target::Guest(conn) => Some(conn),
+                _ => self.lan_acting,
+            };
+            match guest.and_then(|conn| Some((conn, self.lan.as_ref()?))) {
+                Some((conn, host)) => {
+                    let packet = host
+                        .hub
+                        .sound_packet(&sound, at, v, pitch, source as i32, seed);
+                    if t == Target::Player {
+                        self.guest_packets.push(packet);
+                    } else {
+                        host.hub.send_to(conn, &packet);
+                    }
+                }
+                None => self.audio.play_on(source, &sound, Some(at), v, pitch),
+            }
+            tracker.mark(&holder(self.target_name(t)));
         }
         let name = Text::literal(sound.clone());
         let (message, total) = tracker.message(
@@ -605,8 +644,10 @@ impl Game<'_> {
         let reached = reached.len() as i32;
         if !local {
         } else if count <= 0 {
-            // No count: one particle with the delta as velocity.
-            self.particles.create(&options, pos, delta);
+            // handleParticleEvent, count 0: one particle, the speed times
+            // the delta as velocity (both sent as floats, multiplied as floats).
+            self.particles
+                .create(&options, pos, delta.map(|d| f64::from(speed * d as f32)));
         } else {
             for _ in 0..count {
                 let r = self.particles.random();

crates/horizon-client/src/game/consume.rs

@@ -19,7 +19,17 @@ use std::convert::Infallible;
 
 type ItemConsumable = Consumable<String, ConsumeEffect>;
 
+/// `EntityEvent.USE_ITEM_COMPLETE`: the server finished the player's use.
+pub(super) const USE_ITEM_COMPLETE_EVENT: i8 = 9;
+
 impl Game<'_> {
+    /// `ServerPlayer.completeUsingItem`: the player's own client is told
+    /// first, and completes the use itself (eating the food there too).
+    pub(super) fn send_use_item_complete(&mut self) {
+        if self.lan_acting.is_some() {
+            self.guest_entity_events.push(USE_ITEM_COMPLETE_EVENT);
+        }
+    }
     /// `Consumable.emitParticlesAndSounds(user.getRandom(), user, stack, count)`.
     pub(super) fn emit_consume(
         &mut self,
@@ -57,6 +67,17 @@ impl Game<'_> {
             self.audio
                 .play("minecraft:entity.player.burp", self.feet(), 0.5, pitch);
         }
+        // SuspiciousStewEffects.onConsume, a ConsumableListener: each entry is
+        // added as a `MobEffectInstance(effect, duration)` (amplifier 0).
+        if let Some(data) = stack.extra.as_deref() {
+            for (id, duration) in &data.stew_effects {
+                if let Some(def) = horizon_client::brewing::effect(id) {
+                    self.add_player_effect(horizon_client::effects::EffectInstance::new(
+                        def.id, *duration, 0,
+                    ));
+                }
+            }
+        }
         for effect in &consumable.effects {
             self.apply_consume_effect(effect);
         }

crates/horizon-client/src/game/control.rs

@@ -628,6 +628,9 @@ impl Game<'_> {
                     // The port, or the game rules' search and number boxes.
                     Screen::WorldOptions if text == "\\b" => self.world_options_text(None),
                     Screen::WorldOptions => self.world_options_text(Some(text)),
+                    Screen::Inventory if self.mod_browser_typing() => {
+                        self.mod_browser_text((text != "\\b").then_some(text), text == "\\b")
+                    }
                     Screen::Inventory if self.recipe_search_focused() => {
                         self.recipe_text(Some(text), false)
                     }
@@ -875,6 +878,9 @@ impl Game<'_> {
             Screen::Advancements => "advancements",
             Screen::WorldOptions => "world-options",
             Screen::Friends => "friends",
+            Screen::ServerLinks => "server-links",
+            Screen::ConfirmLink => "confirm-link",
+            Screen::DialogWarning => "dialog-warning",
             Screen::CommandBlock => "command-block",
             Screen::Win => "win",
             Screen::Mod => "mod",
@@ -1080,6 +1086,9 @@ impl Game<'_> {
             "flashes": self.lightning_seen[1], "flash": self.flash});
         // Primed TNT, falling blocks, projectiles, tridents and end crystals.
         status["projectiles"] = json!(self.projectiles_status());
+        let mut fangs_vertices = Vec::new();
+        self.fangs_geometry(glam::DVec3::ZERO, 0.5, &mut fangs_vertices);
+        status["fangs_vertices"] = json!(fangs_vertices.len());
         status["maps"] = json!(self.maps_status());
         // The particles made so far, by type.
         status["particles"] = json!(self.particles.made());

crates/horizon-client/src/game/copper_golems.rs

@@ -44,13 +44,13 @@ impl Game<'_> {
         slot: usize,
         stack: Option<ItemStack>,
     ) {
-        if let Some(e) = self
-            .world
-            .block_entities
-            .get_mut(&(chest[0], chest[1], chest[2]))
+        let key = (chest[0], chest[1], chest[2]);
+        if let Some(e) = self.world.block_entities.get_mut(&key)
             && let Some(s) = e.slots_mut().get_mut(slot)
         {
             *s = stack;
+            // TransportItemsBetweenContainers calls Container.setChanged.
+            self.container_changed(key);
         }
     }
     /// `ContainerOpenersCounter.recheckOpeners` every five ticks: the golems

crates/horizon-client/src/game/creaking.rs

@@ -218,8 +218,9 @@ impl Game<'_> {
         );
     }
     /// `CreakingHeartBlock.playerWillDestroy`: the heart's creaking twitches to
-    /// death and a natural heart drops experience.
-    pub(super) fn creaking_heart_broken(&mut self, pos: [i32; 3]) {
+    /// death and a natural heart drops experience. `onExplosionHit` does the
+    /// same for the creaking (`by_player` false), without the experience.
+    pub(super) fn creaking_heart_broken(&mut self, pos: [i32; 3], by_player: bool) {
         let key = (pos[0], pos[1], pos[2]);
         if !matches!(
             self.world.block_entities.get(&key),
@@ -242,7 +243,7 @@ impl Game<'_> {
             .state(state)
             .and_then(|s| s.properties.get("natural").cloned())
             .is_some_and(|v| v == "true");
-        if natural && !self.creative && !self.spectator() {
+        if by_player && natural && !self.creative && !self.spectator() {
             let xp = 20 + self.world.random.next_int_bound(5).unwrap_or(0) as u32;
             self.spawn_orbs(
                 [

crates/horizon-client/src/game/creatures.rs

@@ -18,6 +18,7 @@ use horizon_client::{
         spawning::{self, BiomeFacts},
     },
     projectiles::{Hit, Projectile, ProjectileKind, ProjectileWorld},
+    text::Text,
 };
 use horizon_core::{
     geometry::{Aabb, Vec3, traverse_blocks},
@@ -45,10 +46,22 @@ pub(super) struct Creatures {
     pub projectiles: Vec<Projectile>,
     /// Wind bursts from a guest's turn, waiting for it to end (game/wind.rs).
     pub wind_bursts: Vec<super::wind::Burst>,
+    /// Explosion packets from a guest's turn, waiting for it to end
+    /// (centre, small, radius, blocks hit; game/lan_particles.rs).
+    pub lan_explosions: Vec<([f64; 3], bool, f32, usize)>,
     /// Ticks left of the elder guardian's apparition (MobAppearanceParticle).
     pub elder_apparition: i32,
     /// The wandering trader spawner's clock.
     pub trader: super::wandering_trader::Spawner,
+    /// Particles from a guest's turn, waiting for it to end
+    /// (`lan_send_particles`: options, centre, spread, speed, count).
+    pub lan_particles: Vec<(
+        horizon_client::particles::ParticleOptions,
+        [f64; 3],
+        [f64; 3],
+        f64,
+        u32,
+    )>,
 }
 pub(super) struct ProjWorld<'a, 'w> {
     pub w: &'a MobWorld<'w>,
@@ -197,6 +210,7 @@ impl Game<'_> {
             uuid: self.level.player_uuid.unwrap_or_default(),
             allies: std::sync::Arc::new(self.player_allies()),
             remote: false,
+            passenger: self.riding.is_some(),
         })
     }
     /// Biome facts at a position for finalizeSpawn and variant rules.
@@ -430,6 +444,12 @@ impl Game<'_> {
             ),
         }
     }
+    /// What the generator finalizes this level's structure mobs with.
+    pub(super) fn share_spawn_conditions(&self) {
+        if let Some(terrain) = self.end.locator() {
+            terrain.set_spawn_conditions(self.difficulty_id() as u8, self.world.day_time);
+        }
+    }
     /// `ServerLevel.getCurrentDifficultyAt`.
     pub(super) fn local_difficulty(&self, at: [f64; 3]) -> spawning::LocalDifficulty {
         use horizon_world::food::Difficulty;
@@ -526,6 +546,8 @@ impl Game<'_> {
             _ => Vec::new(),
         };
         let mut guest_events = Vec::new();
+        // The mobs whose bodies go this tick: (id, feet, width, height).
+        let mut gone = Vec::new();
         let level_random;
         {
             // The level random, lent to the mobs (brain behaviours draw from
@@ -598,6 +620,11 @@ impl Game<'_> {
                 let from = events.len();
                 let kept = m.tick(&w, &mut scratch, &mut events);
                 horizon_client::mobs::take_mob_pushes(&mut events, from, &mut pushes);
+                // LivingEntity.tickDeath: after twenty ticks the body is removed.
+                if !kept && !m.removed && !m.alive() && m.death_time >= 20 {
+                    let (width, height) = (f64::from(m.width()), f64::from(m.height()));
+                    gone.push((m.id, m.position, width, height));
+                }
                 if let Some(conn) = seen_guest {
                     // ShulkerBullet.finalTarget is the guest's entity: the
                     // bullet homes on it while the projectiles tick, where
@@ -656,9 +683,16 @@ impl Game<'_> {
         }
         self.mobs.append(&mut mobs);
         self.died = died;
+        // ... and entity event 60 goes out as it is: the poof.
+        for (id, at, width, height) in gone {
+            let at = [at.x, at.y, at.z];
+            self.lan_entity_event(id as i32, 60, at);
+            self.death_poof(at, width, height);
+        }
         self.sync_riders();
         self.tick_skeleton_traps();
         self.tick_apparition();
+        self.guardian_bubbles();
         self.villager_reputation_tick();
         self.merchant_tick();
         self.villager_pickups();
@@ -682,6 +716,22 @@ impl Game<'_> {
         self.handle_mob_events(queued)?;
         Ok(())
     }
+    /// `LivingEntity.makePoofParticles` (entity event 60) about a mob's box.
+    pub(super) fn death_poof(&mut self, at: [f64; 3], width: f64, height: f64) {
+        let options = horizon_client::particles::ParticleOptions::simple(
+            horizon_client::particles::ParticleType::Poof,
+        );
+        for _ in 0..20 {
+            let r = self.particles.level_random();
+            let xa = r.next_gaussian() * 0.02;
+            let ya = r.next_gaussian() * 0.02;
+            let za = r.next_gaussian() * 0.02;
+            let x = at[0] + width * (2.0 * r.next_double() - 1.0) - xa * 10.0;
+            let y = at[1] + height * r.next_double() - ya * 10.0;
+            let z = at[2] + width * (2.0 * r.next_double() - 1.0) - za * 10.0;
+            self.particles.add(&options, [x, y, z], [xa, ya, za]);
+        }
+    }
     /// LivingEntity.die / dropAllDeathLoot.
     fn mob_died(&mut self, m: &Mob) {
         let killer = self.last_hurt_by_player.remove(&m.id);
@@ -892,11 +942,29 @@ impl Game<'_> {
             self.spawn_item(d, at, [0.0, 0.2, 0.0], 10);
         }
     }
+    /// Adds a projectile, giving it an id from the entity counter
+    /// (`Entity.id`, the same counter as the rest) when it has none.
+    pub(super) fn add_projectile(&mut self, mut p: horizon_client::projectiles::Projectile) {
+        if p.id == 0 {
+            self.next_entity += 1;
+            p.id = self.next_entity;
+        }
+        self.creatures.projectiles.push(p);
+    }
     pub(super) fn handle_mob_events(&mut self, events: Vec<MobEvent>) -> Result<()> {
         for e in events {
             match e {
                 MobEvent::SquidCycle { mob, at } => self.lan_entity_event(mob as i32, 19, at),
                 MobEvent::RabbitHop { mob, at } => self.lan_entity_event(mob as i32, 1, at),
+                MobEvent::Drown { mob, at } => {
+                    self.lan_entity_event(mob as i32, super::combat::DROWN_EVENT, at);
+                    let v = self
+                        .mobs
+                        .iter()
+                        .find(|m| m.id == mob)
+                        .map_or([0.0; 3], |m| [m.velocity.x, m.velocity.y, m.velocity.z]);
+                    self.drown_particles(at, v);
+                }
                 MobEvent::Sound(name, at, volume, pitch)
                 | MobEvent::LocalSound(name, at, volume, pitch) => {
                     self.audio
@@ -944,6 +1012,21 @@ impl Game<'_> {
                         }
                     }
                 }
+                MobEvent::Shift { target, delta } => {
+                    let d = Vec3::new(delta[0], delta[1], delta[2]);
+                    match target {
+                        Who::Player => {
+                            if let Some(p) = self.player.as_mut() {
+                                p.position = p.position.add_vector(d);
+                            }
+                        }
+                        Who::Mob(id) => {
+                            if let Some(m) = self.mobs.iter_mut().find(|m| m.id == id) {
+                                m.position = m.position.add_vector(d);
+                            }
+                        }
+                    }
+                }
                 MobEvent::Wololo { mob } => {
                     if let Some(m) = self.mobs.iter_mut().find(|m| m.id == mob) {
                         // DyeColor.RED.
@@ -1078,7 +1161,12 @@ impl Game<'_> {
                     self.next_entity += 1;
                     p.id = self.next_entity;
                     let (owner, at) = (p.owner, [p.position.x, p.position.y, p.position.z]);
-                    self.creatures.projectiles.push(p);
+                    // LlamaSpit.recreateFromPacket: the spit's burst on the client.
+                    if p.kind == ProjectileKind::LlamaSpit {
+                        let v = p.velocity;
+                        self.particles.llama_spit_burst(at, [v.x, v.y, v.z]);
+                    }
+                    self.add_projectile(p);
                     self.projectile_event("minecraft:projectile_shoot", owner, at);
                 }
                 MobEvent::Spawn(mut m) => {
@@ -1640,11 +1728,34 @@ impl Game<'_> {
     pub(super) fn mob_hits_player_kind(&mut self, amount: f32, from: [f64; 3], kind: &str) {
         self.mob_hits_player(amount, from, kind);
     }
+    /// Damage whose causing mob is known (`cause`, or none): not guessed
+    /// from the mob nearest to `from`.
+    pub(super) fn mob_hits_player_caused(
+        &mut self,
+        amount: f32,
+        from: [f64; 3],
+        kind: &str,
+        cause: Option<u32>,
+    ) {
+        self.hurt_player_from(amount, Some(from), kind, Some(cause));
+    }
     pub(super) fn mob_hits_player(
         &mut self,
         amount: f32,
         from: [f64; 3],
         damage_type: &str,
+    ) -> bool {
+        self.hurt_player_from(amount, Some(from), damage_type, None)
+    }
+    /// `hurtServer` on the player. `from` is the source's position (none: no
+    /// direction), `known`: the causing mob when it is given (`/damage`),
+    /// else the melee attacker is the mob nearest to `from`.
+    pub(super) fn hurt_player_from(
+        &mut self,
+        amount: f32,
+        from: Option<[f64; 3]>,
+        damage_type: &str,
+        known: Option<Option<u32>>,
     ) -> bool {
         // ServerPlayer.canHarmPlayer refused another player's projectile.
         if self.creative || self.combat.refuse_player_hit {
@@ -1657,23 +1768,26 @@ impl Game<'_> {
             .damage_tags
             .get("minecraft:is_projectile")
             .is_some_and(|t| t.contains(damage_type));
-        let blocking = self.player_blocking(Some(from), damage_type, false);
+        let blocking = self.player_blocking(from, damage_type, false);
         let raised = blocking.is_some();
         // Melee: the attacker stands at `from` (another player's hit has no mob behind it).
-        let attacker = (!projectile && damage_type != "minecraft:player_attack")
-            .then(|| {
-                self.mobs
-                    .iter()
-                    .filter(|m| m.alive())
-                    .min_by(|a, b| {
-                        let d = |m: &horizon_client::mobs::Mob| {
-                            (m.position.x - from[0]).powi(2) + (m.position.z - from[2]).powi(2)
-                        };
-                        d(a).total_cmp(&d(b))
-                    })
-                    .map(|m| m.id)
-            })
-            .flatten();
+        let attacker = match known {
+            Some(known) => known,
+            None => from
+                .filter(|_| !projectile && damage_type != "minecraft:player_attack")
+                .and_then(|from| {
+                    self.mobs
+                        .iter()
+                        .filter(|m| m.alive())
+                        .min_by(|a, b| {
+                            let d = |m: &horizon_client::mobs::Mob| {
+                                (m.position.x - from[0]).powi(2) + (m.position.z - from[2]).powi(2)
+                            };
+                            d(a).total_cmp(&d(b))
+                        })
+                        .map(|m| m.id)
+                }),
+        };
         // The causing entity for the death message.
         let owner = self.combat.projectile_owner.take();
         if let Some(a) = attacker.or(owner) {
@@ -1701,7 +1815,10 @@ impl Game<'_> {
             // LivingEntity.hurtServer's dealDefaultKnockback: not inside the
             // hurt cooldown (a stronger hit there only adds its difference).
             if o.knockback {
-                let (xd, zd) = (from[0] - player.position.x, from[2] - player.position.z);
+                // No source position: a random direction.
+                let (xd, zd) = from.map_or((0.0, 0.0), |from| {
+                    (from[0] - player.position.x, from[2] - player.position.z)
+                });
                 self.knock_back_player(f64::from(0.4_f32), xd, zd);
                 if let Some(p) = self.player.as_mut()
                     && let Some(r) = p.hurt_log.last_mut()
@@ -1850,6 +1967,7 @@ impl Game<'_> {
         let mut hits = Vec::new();
         let mut deflections: Vec<[f64; 3]> = Vec::new();
         let mut arrow_events = Vec::new();
+        let mut trails = Vec::new();
         {
             let mut targets: Vec<(Who, Aabb)> = self
                 .mobs
@@ -1941,6 +2059,10 @@ impl Game<'_> {
                 if shooter.is_some() {
                     p.owner = Some(Who::Player);
                 }
+                // AbstractHurtingProjectile.tick ends with createParticleTrail.
+                if super::remote_projectiles::has_smoke_trail(&p.kind) {
+                    trails.push(p.position);
+                }
                 if let Some(a) = p.arrow.as_mut() {
                     arrow_events.extend(a.events.drain(..).map(|e| (p.position, e)));
                 }
@@ -1983,6 +2105,7 @@ impl Game<'_> {
                 keep
             });
         }
+        self.smoke_trails(trails);
         for at in deflections {
             self.audio
                 .play("minecraft:entity.breeze.deflect", Some(at), 1.0, 1.0);
@@ -2015,6 +2138,7 @@ impl Game<'_> {
                 _ => self.projectile_hit(&p, hit)?,
             }
         }
+        self.flush_lan_explosions();
         self.flush_wind_bursts()
     }
     /// `projectile_hit` for a projectile the guest `conn` shot, run as them;
@@ -2039,6 +2163,33 @@ impl Game<'_> {
             None => self.projectile_hit(p, hit),
         }
     }
+    /// What an arrow or a thrown trident hits an entity of type `victim`
+    /// for (`AbstractArrow.onHitEntity`, `ThrownTrident.onHitEntity`): a
+    /// trident's 8 through `EnchantmentHelper.modifyDamage` of the trident
+    /// (Impaling's `minecraft:damage` on `#sensitive_to_impaling`).
+    fn shot_damage(&mut self, shot: &mut Projectile, victim: Option<&str>) -> f32 {
+        if !matches!(shot.kind, ProjectileKind::Trident) {
+            return arrow_damage(shot, &mut self.world.random) + shot.bonus.damage;
+        }
+        let Some(trident) = shot.arrow.as_ref().map(|a| a.pickup_item.clone()) else {
+            return 8.0;
+        };
+        let ctx = horizon_client::enchant::EffectContext {
+            this: victim,
+            attacker: (shot.owner == Some(Who::Player)).then_some("minecraft:player"),
+            direct_attacker: Some("minecraft:trident"),
+            damage_type: Some("minecraft:trident"),
+            items: Some(self.res.items()),
+            ..Default::default()
+        };
+        self.res.stations().enchantments.modify_value(
+            Some(&trident),
+            "minecraft:damage",
+            &ctx,
+            &mut self.world.random,
+            8.0,
+        )
+    }
     /// What an arrow's tick asked for: its particles and sounds.
     fn arrow_event(&mut self, at: Vec3, event: horizon_client::arrows::ArrowEvent) {
         use horizon_client::arrows::{ArrowEvent, ArrowParticle, ArrowSound, BlockReaction};
@@ -2067,6 +2218,8 @@ impl Game<'_> {
                     ArrowSound::Splash => "minecraft:entity.generic.splash",
                     ArrowSound::HitGround => "minecraft:entity.arrow.hit",
                     ArrowSound::Extinguish => "minecraft:entity.generic.extinguish_fire",
+                    ArrowSound::TridentHitGround => "minecraft:item.trident.hit_ground",
+                    ArrowSound::TridentHit => "minecraft:item.trident.hit",
                 };
                 self.audio
                     .play(name, Some([at.x, at.y, at.z]), volume, pitch);
@@ -2118,11 +2271,9 @@ impl Game<'_> {
             ArrowEvent::ShootEvent | ArrowEvent::Drop => {}
         }
     }
-    /// `Level.isRainingAt` for arrows: raining, open to the sky (the biome's
-    /// precipitation is not checked here).
+    /// `Level.isRainingAt` for arrows.
     fn arrow_rain(&self) -> impl Fn(BlockPos) -> bool + '_ {
-        let raining = self.world.weather.levels(1.0).0 > 0.2;
-        move |p: BlockPos| raining && self.world.light(p.x, p.y, p.z) >> 4 == 15
+        move |p: BlockPos| self.raining_at(p)
     }
     /// The level as arrows see it.
     fn arrow_scene<'s>(
@@ -2160,7 +2311,7 @@ impl Game<'_> {
             }
         }
         if keep {
-            self.creatures.projectiles.push(arrow);
+            self.add_projectile(arrow);
         }
     }
     /// `TargetBlock.onProjectileHit`: a target block takes its power from
@@ -2216,11 +2367,11 @@ impl Game<'_> {
             && id >= super::dragon::SPECIAL
         {
             let by_player = p.owner == Some(Who::Player);
-            if let ProjectileKind::Arrow { .. } = p.kind {
+            if p.arrow.is_some() {
                 // AbstractArrow.onHitEntity: spent if the part or crystal took
                 // it, else turned back (a perched dragon sets it alight first).
                 let mut arrow = p.clone();
-                let amount = arrow_damage(&mut arrow, &mut self.world.random) + p.bonus.damage;
+                let amount = self.shot_damage(&mut arrow, None);
                 let outcome = match self.hit_special(id, amount, by_player, true) {
                     super::dragon::Hurt::Landed { .. } => EntityHit::Hurt,
                     super::dragon::Hurt::Refused => EntityHit::Refused,
@@ -2241,17 +2392,15 @@ impl Game<'_> {
             self.hit_special(id, amount, by_player, false);
             return Ok(());
         }
-        if let (
-            ProjectileKind::Arrow { .. },
-            Hit::Entity {
+        if p.arrow.is_some()
+            && let Hit::Entity {
                 who: Who::Mob(id), ..
-            },
-        ) = (&p.kind, hit)
+            } = hit
             && let Some(i) = self.carts.iter().position(|c| c.id == id)
         {
             // AbstractArrow.onHitEntity on a minecart.
             let mut arrow = p.clone();
-            let amount = arrow_damage(&mut arrow, &mut self.world.random) + p.bonus.damage;
+            let amount = self.shot_damage(&mut arrow, None);
             let burning = p.arrow.as_ref().is_some_and(|a| a.on_fire());
             let creative = p.owner == Some(Who::Player) && self.creative;
             self.arrow_hits_cart(i, amount, p.velocity, burning, creative);
@@ -2262,7 +2411,7 @@ impl Game<'_> {
         // Projectile.onHit: the landing is heard.
         self.projectile_event("minecraft:projectile_land", p.owner, atp);
         let source_kind = match p.kind {
-            ProjectileKind::Arrow { .. } => DamageKind::Arrow,
+            ProjectileKind::Arrow { .. } | ProjectileKind::Trident => DamageKind::Arrow,
             ProjectileKind::SmallFireball | ProjectileKind::LargeFireball { .. } => {
                 DamageKind::Fireball
             }
@@ -2274,6 +2423,40 @@ impl Game<'_> {
             from: Some([p.previous.x, p.previous.y, p.previous.z]),
         };
         match (&p.kind, hit) {
+            // ThrownTrident.onHitEntity: 8 damage (Impaling on aquatic mobs),
+            // dealt whether or not the hurt lands, then it bounces off.
+            (ProjectileKind::Trident, Hit::Entity { who, .. }) => {
+                let mut trident = p.clone();
+                let victim = match who {
+                    Who::Mob(id) => self
+                        .mobs
+                        .iter()
+                        .find(|m| m.id == id)
+                        .map(|m| m.kind.id.clone()),
+                    Who::Player => Some("minecraft:player".to_owned()),
+                };
+                let amount = self.shot_damage(&mut trident, victim.as_deref());
+                let hurt = match who {
+                    Who::Player => self.mob_hits_player(
+                        amount,
+                        [p.previous.x, p.previous.y, p.previous.z],
+                        "minecraft:trident",
+                    ),
+                    Who::Mob(id) => self
+                        .mobs
+                        .iter_mut()
+                        .find(|m| m.id == id)
+                        .is_some_and(|m| m.damage(amount, source)),
+                };
+                let outcome = if hurt {
+                    EntityHit::Hurt
+                } else {
+                    EntityHit::Refused
+                };
+                self.finish_arrow_hit(trident, outcome);
+            }
+            // AbstractArrow.onHitBlock plays its sound itself (ArrowEvent).
+            (ProjectileKind::Trident, Hit::Block { .. }) => {}
             (ProjectileKind::Arrow { effect, .. }, Hit::Entity { who, .. }) => {
                 let mut arrow = p.clone();
                 let amount = arrow_damage(&mut arrow, &mut self.world.random) + p.bonus.damage;
@@ -2495,14 +2678,30 @@ impl Game<'_> {
                     if d2 < 16.0 && !self.creative {
                         let scale = 1.0 - d2.sqrt() / 4.0;
                         let t = (f64::from(*ticks) * scale + 0.5) as i32;
-                        if let Some(owner) = self.combat.projectile_owner {
-                            self.note_attacker("minecraft:indirect_magic", owner);
-                        }
                         match *effect {
-                            "minecraft:instant_damage" => self.hurt_player_by(
-                                "minecraft:indirect_magic",
-                                6.0 * (1 << *amplifier) as f32 * scale as f32,
-                            ),
+                            "minecraft:instant_damage" => {
+                                // indirectMagic(potion, owner), built where the
+                                // hurt happens: the thrower, or the potion
+                                // itself when it has none. A status effect
+                                // deals no damage, so it records no source.
+                                let owner = self
+                                    .combat
+                                    .projectile_owner
+                                    .filter(|id| self.mob_display_name(*id).is_some());
+                                match owner {
+                                    Some(owner) => {
+                                        self.note_attacker("minecraft:indirect_magic", owner)
+                                    }
+                                    None => self.note_direct_entity(
+                                        "minecraft:indirect_magic",
+                                        Text::translate("entity.minecraft.splash_potion", &[]),
+                                    ),
+                                }
+                                self.hurt_player_by(
+                                    "minecraft:indirect_magic",
+                                    6.0 * (1 << *amplifier) as f32 * scale as f32,
+                                )
+                            }
                             e if t > 20 => self.give_player_effect(e, t, *amplifier),
                             _ => {}
                         }
@@ -2706,6 +2905,14 @@ impl Game<'_> {
             self.swing_arm();
             return Ok(true);
         }
+        if self.interact_armadillo(index, &item) {
+            if let Some(stack) = &held {
+                let target = self.mob_entity(&self.mobs[index]);
+                self.trigger_item_entity("minecraft:player_interacted_with_entity", stack, &target);
+            }
+            self.swing_arm();
+            return Ok(true);
+        }
         if self.interact_copper_golem(index, &item) {
             self.swing_arm();
             return Ok(true);
@@ -2761,6 +2968,16 @@ impl Game<'_> {
                 consume = true;
                 sound = Some("entity.cow.milk");
             }
+            // Goat.mobInteract: a bucket on an adult gives milk.
+            Species::Goat if item == "minecraft:bucket" && !m.is_baby() => {
+                give = Some("minecraft:milk_bucket");
+                consume = true;
+                sound = Some(if m.extra.screaming {
+                    "entity.goat.screaming.milk"
+                } else {
+                    "entity.goat.milk"
+                });
+            }
             Species::Mooshroom if item == "minecraft:bowl" && !m.is_baby() => {
                 give = Some("minecraft:mushroom_stew");
                 consume = true;
@@ -3021,6 +3238,19 @@ impl Game<'_> {
                     self.trigger_entity("minecraft:tame_animal", "entity", &view);
                 }
             }
+            // Tadpole.feed: frog food ages it by a tenth of the time left to
+            // grow into a frog (it grows on its next tick once past 24000).
+            Species::Tadpole if is_food && !m.extra.age_locked => {
+                consume = true;
+                let left = 24_000 - m.extra.age;
+                m.extra.age += ((left / 20) as f32 * 0.1) as i32 * 20;
+                // One happy villager particle at rest about the body.
+                self.particles_around_mob(
+                    self.mobs[index].id,
+                    "happy_villager",
+                    horizon_client::particles::Burst::HORSE_EATING,
+                );
+            }
             // HappyGhast.canFallInLove: never, so only a ghastling takes food.
             _ if is_food
                 && m.kind.flags.animal
@@ -3108,6 +3338,50 @@ impl Game<'_> {
         }
         Ok(true)
     }
+    /// `Armadillo.mobInteract`: a brush brushes a scute off an adult
+    /// (`brushOffScute`) and loses 16 durability.
+    fn interact_armadillo(&mut self, index: usize, item: &str) -> bool {
+        let m = &self.mobs[index];
+        if item != "minecraft:brush"
+            || m.species() != Species::Armadillo
+            || !m.alive()
+            || m.is_baby()
+        {
+            return false;
+        }
+        let (id, at) = (m.id, m.position);
+        let feet = [at.x, at.y, at.z];
+        let tool = self.held().cloned();
+        let table = "minecraft:brush/armadillo";
+        for d in self.sequence_loot(table, table, tool.as_ref()) {
+            self.spawn_at_location(at, 0.0, d);
+        }
+        self.audio
+            .play("minecraft:entity.armadillo.brush", Some(feet), 1.0, 1.0);
+        let ctx = self.who_context(Some(Who::Mob(id)), None);
+        self.post_game_event("minecraft:entity_interact", feet, ctx);
+        // ItemStack.hurtAndBreak(16).
+        if !self.creative
+            && let Some(stack) = tool
+        {
+            let max = self
+                .res
+                .items()
+                .get(&stack.item)
+                .map_or(0, |i| i.max_damage);
+            if max > 0 {
+                let loss = self.durability_loss(&stack, 16);
+                let slot = self.held_slot();
+                if let Some(held) = self.stack_in_mut(slot).as_mut() {
+                    held.damage += loss;
+                    if held.damage >= max {
+                        *self.stack_in_mut(slot) = None;
+                    }
+                }
+            }
+        }
+        true
+    }
     pub(super) fn damage_held_tool(&mut self) {
         if self.creative {
             return;
@@ -3162,7 +3436,7 @@ impl Game<'_> {
             velocity,
             on_ground,
         );
-        self.creatures.projectiles.push(proj);
+        self.add_projectile(proj);
         self.player_projectile_shot();
         // ItemStack.use's applyAfterUseComponentSideEffects: the pearl's
         // second is the `use_cooldown` component, as for any thrown item.
@@ -3255,11 +3529,65 @@ impl Game<'_> {
             }
         }
     }
+    /// `Guardian.aiStep` on a client: two bubbles a tick trailing a guardian
+    /// that swims along, and bubbles up the beam to its target. The server
+    /// never draws them, so the mob's own random stays untouched.
+    pub(super) fn guardian_bubbles(&mut self) {
+        use horizon_client::mobs::guardian;
+        use horizon_client::particles::{ParticleOptions, ParticleType};
+        let mut swimming = Vec::new();
+        let mut beams = Vec::new();
+        for m in &self.mobs {
+            if !m.alive() || !matches!(m.species(), Species::Guardian | Species::ElderGuardian) {
+                continue;
+            }
+            let at = [m.position.x, m.position.y, m.position.z];
+            if m.extra.flag2 && m.fluids.in_water {
+                let (width, height, _) = m.dims();
+                swimming.push((at, width, height, m.view_vector()));
+            }
+            if let Some((_, scale)) = guardian::beam(m, 0.0)
+                && let Some(t) = self.beam_target(m.ai.target, 1.0)
+            {
+                beams.push(([at[0], m.eye_y(), at[2]], [t.x, t.y, t.z], f64::from(scale)));
+            }
+        }
+        let bubble = ParticleOptions::simple(ParticleType::Bubble);
+        for (at, width, height, view) in swimming {
+            for _ in 0..2 {
+                let (x, y, z) = {
+                    let r = self.particles.random();
+                    (r.next_double(), r.next_double(), r.next_double())
+                };
+                let p = [
+                    at[0] + width * (2.0 * x - 1.0) * 0.5 - view[0] * 1.5,
+                    at[1] + height * y - view[1] * 1.5,
+                    at[2] + width * (2.0 * z - 1.0) * 0.5 - view[2] * 1.5,
+                ];
+                self.particles.add(&bubble, p, [0.0; 3]);
+            }
+        }
+        for (eye, target, scale) in beams {
+            let d = [target[0] - eye[0], target[1] - eye[1], target[2] - eye[2]];
+            let length = (d[0] * d[0] + d[1] * d[1] + d[2] * d[2]).sqrt();
+            if length <= 0.0 {
+                continue;
+            }
+            let mut dist = self.particles.random().next_double();
+            while dist < length {
+                let r = self.particles.random();
+                dist += 1.8 - scale + r.next_double() * (1.7 - scale);
+                let f = dist / length;
+                let p = [eye[0] + d[0] * f, eye[1] + d[1] * f, eye[2] + d[2] * f];
+                self.particles.add(&bubble, p, [0.0; 3]);
+            }
+        }
+    }
     /// Mob models and projectiles for the entity pass.
     pub(super) fn mob_geometry(&self, camera: glam::DVec3, alpha: f64, out: &mut Vec<Vertex>) {
         let atlas = &self.gui.atlas;
         let lookup = |name: &str| atlas.sprites.get(name).map(|r| [r.u0, r.v0, r.u1, r.v1]);
-        let scale = f64::from(self.settings.entity_distance);
+        let scale = self.view_scale();
         for mob in &self.mobs {
             let entity_start = out.len();
             // Entity.DATA_SHARED_FLAGS_ID invisible: only the name tag draws.
@@ -3268,9 +3596,16 @@ impl Game<'_> {
             }
             let d = glam::DVec3::new(mob.position.x, mob.position.y, mob.position.z) - camera;
             // Entity.shouldRenderAtSqrDistance: 64 times the bounding box's
-            // mean edge, scaled by the entity distance option.
+            // mean edge, scaled by the view scale. RemotePlayer's box counts
+            // ten times.
             let (w, h, _) = mob.dims();
-            let range = (w + h + w) / 3.0 * 64.0 * scale;
+            let edge = (w + h + w) / 3.0
+                * if &*mob.kind.id == "minecraft:player" {
+                    10.0
+                } else {
+                    1.0
+                };
+            let range = edge * 64.0 * scale;
             if d.length_squared() >= range * range {
                 continue;
             }
@@ -3411,6 +3746,30 @@ impl Game<'_> {
                 }
                 continue;
             }
+            // ThrownTridentRenderer.
+            if matches!(a.kind, ProjectileKind::Trident) {
+                let Some(model) = self.trident_model.as_ref() else {
+                    continue;
+                };
+                let Some(r) = atlas.sprites.get("entity/trident/trident").copied() else {
+                    continue;
+                };
+                let m = glam::Mat4::from_translation(c)
+                    * glam::Mat4::from_rotation_y((a.yaw - 90.0).to_radians())
+                    * glam::Mat4::from_rotation_z((a.pitch + 90.0).to_radians());
+                let poses = horizon_client::mobs::anim::Poses::new(model);
+                horizon_client::mobs::render::draw(
+                    model,
+                    m,
+                    &poses,
+                    [r.u0, r.v0, r.u1, r.v1],
+                    0xFFFF_FFFF,
+                    packed,
+                    0,
+                    out,
+                );
+                continue;
+            }
             // WindChargeRenderer.
             if matches!(
                 a.kind,
@@ -3524,6 +3883,7 @@ pub(super) fn damage_type(kind: horizon_client::mobs::DamageKind, player: bool)
         K::InFire => "minecraft:in_fire",
         K::Lava => "minecraft:lava",
         K::Drown => "minecraft:drown",
+        K::DryOut => "minecraft:dry_out",
         K::Magic => "minecraft:magic",
         K::Sting => "minecraft:sting",
         K::Cactus => "minecraft:cactus",
@@ -3531,6 +3891,7 @@ pub(super) fn damage_type(kind: horizon_client::mobs::DamageKind, player: bool)
         K::InWall => "minecraft:in_wall",
         K::Thorns => "minecraft:thorns",
         K::SonicBoom => "minecraft:sonic_boom",
+        K::Freeze => "minecraft:freeze",
         K::OutOfWorld => "minecraft:out_of_world",
     }
 }

crates/horizon-client/src/game/crossbow.rs

@@ -222,7 +222,7 @@ impl Game<'_> {
                     a.pierce = pierce;
                 }
                 arrow.shoot(&mut self.world.random, dir.to_array(), power, 1.0);
-                self.creatures.projectiles.push(arrow);
+                self.add_projectile(arrow);
             }
             self.player_projectile_shot();
             let pitch = if index == 0 {

crates/horizon-client/src/game/cushions.rs

@@ -348,11 +348,15 @@ impl Game<'_> {
         let Some(state) = self.pack.assets.registry.default_state(&name) else {
             return;
         };
-        let at = [
-            c.position.x.floor() as i32,
-            c.position.y.floor() as i32,
-            c.position.z.floor() as i32,
-        ];
+        let p = c.position;
+        // Entity.getY(2/3) is relative to the cushion's quarter-block height.
+        let particle_at = [p.x, p.y + 0.25 * (2.0 / 3.0), p.z];
+        // Guest actions temporarily take self.lan; flush once the hub is back.
+        // Queue before resolving a sprite: a dedicated server has no renderer.
+        if self.audio.capture.is_some() {
+            self.lan_cushion_breaks.push((state, particle_at));
+        }
+        let at = [p.x.floor() as i32, p.y.floor() as i32, p.z.floor() as i32];
         let Some((sprite, tint)) = self.particle_sprite(state, at) else {
             return;
         };
@@ -361,14 +365,8 @@ impl Game<'_> {
             sprite,
             tint,
         );
-        let p = c.position;
-        self.particles.send_particles(
-            &options,
-            [p.x, p.y + 0.666_666_7, p.z],
-            [0.25, 0.0625, 0.25],
-            0.05,
-            10,
-        );
+        self.particles
+            .send_particles(&options, particle_at, [0.25, 0.0625, 0.25], 0.05, 10);
     }
 
     /// `BlockAttachedEntity.tick`: survive and burn checks after the post-increment reaches 100.
@@ -455,8 +453,7 @@ impl Game<'_> {
                 glam::DVec3::new(lo.x, lo.y, lo.z),
                 glam::DVec3::new(hi.x, hi.y, hi.z),
             );
-            let range =
-                super::entity_culling::default_range(hi - lo, self.settings.entity_distance);
+            let range = super::entity_culling::default_range(hi - lo, self.view_scale());
             if !self.entity_in_view(camera, (lo + hi) / 2.0, range, lo, hi) {
                 continue;
             }

crates/horizon-client/src/game/debug_keys.rs

@@ -13,7 +13,7 @@ use horizon_client::{
     save::VERSION_NAME,
     text::Text,
 };
-use horizon_core::geometry::Axis;
+use horizon_core::geometry::{Axis, Vec3};
 use winit::keyboard::KeyCode;
 
 /// `ChatFormatting.YELLOW` and `RED`.
@@ -766,7 +766,8 @@ impl Game<'_> {
         }
         let lerp = |a: f64, b: f64| a + f64::from(alpha) * (b - a);
         let lerpf = |a: f32, b: f32| a + alpha * (b - a);
-        for m in &self.mobs {
+        let guests = self.lan.iter().flat_map(|h| h.models.values());
+        for m in self.mobs.iter().chain(guests) {
             if m.removed || m.invisible || m.has_effect("minecraft:invisibility") {
                 continue;
             }
@@ -796,6 +797,159 @@ impl Game<'_> {
             // EntityType.ITEM: 0.25 by 0.25, eyes at 0.2125.
             g.hitbox(pos, (0.25, 0.25), 0.2125, false, (0.0, 0.0));
         }
+        // The other entities (EntityTypes sizes; eyes at 0.85 of the height
+        // unless the type sets one). `at` is the interpolated position.
+        let at = |previous: Vec3, now: Vec3| {
+            [
+                lerp(previous.x, now.x),
+                lerp(previous.y, now.y),
+                lerp(previous.z, now.z),
+            ]
+        };
+        for p in &self.paintings {
+            let (min, max) = p.bounds();
+            let centre = std::array::from_fn(|i| (min[i] + max[i]) / 2.0);
+            g.entity_box(min, max, centre, 0.425, false, step_view(p.step()));
+        }
+        for f in self.item_frames.iter().filter(|f| !f.invisible) {
+            let (min, max) = f.bounds();
+            let centre = std::array::from_fn(|i| (min[i] + max[i]) / 2.0);
+            g.entity_box(min, max, centre, 0.0, false, step_view(f.step()));
+        }
+        for c in &self.cushions {
+            let (min, max) = c.bounds();
+            let p = c.position;
+            g.entity_box(min, max, [p.x, p.y, p.z], 0.2125, false, (0.0, c.yaw));
+        }
+        for a in self.armor_stands.iter().filter(|a| !a.invisible) {
+            // ArmorStand.getDimensions: a marker has none, a small one is
+            // half scale with its eyes at 0.9875.
+            let (size, eye) = match (a.marker, a.small) {
+                (true, _) => ((0.0, 0.0), 0.0),
+                (_, true) => ((0.25, 0.9875), 0.9875),
+                _ => ((0.5, 1.975), 1.7775),
+            };
+            let p = a.position;
+            g.hitbox([p.x, p.y, p.z], size, eye, true, (0.0, a.yaw));
+        }
+        for b in &self.boats {
+            let h = super::boats::HEIGHT as f32;
+            g.hitbox(
+                at(b.previous, b.position),
+                (super::boats::WIDTH as f32, h),
+                h,
+                false,
+                (0.0, b.yaw),
+            );
+        }
+        for c in &self.carts {
+            let (w, h) = (
+                super::minecarts::WIDTH as f32,
+                super::minecarts::HEIGHT as f32,
+            );
+            g.hitbox(
+                at(c.previous, c.position),
+                (w, h),
+                h * 0.85,
+                false,
+                (0.0, c.yaw),
+            );
+        }
+        for o in &self.orbs {
+            g.hitbox(
+                at(o.previous, o.position),
+                (0.5, 0.5),
+                0.425,
+                false,
+                (0.0, 0.0),
+            );
+        }
+        for f in &self.falling {
+            g.hitbox(
+                at(f.previous, f.position),
+                (0.98, 0.98),
+                0.833,
+                false,
+                (0.0, 0.0),
+            );
+        }
+        for t in &self.tnts {
+            g.hitbox(
+                at(t.previous, t.position),
+                (0.98, 0.98),
+                0.15,
+                false,
+                (0.0, 0.0),
+            );
+        }
+        for c in &self.crystals {
+            let p = c.position;
+            g.hitbox([p.x, p.y, p.z], (2.0, 2.0), 1.7, false, (0.0, 0.0));
+        }
+        for p in &self.creatures.projectiles {
+            use horizon_client::projectiles::ProjectileKind as K;
+            let (size, eye) = match p.kind {
+                K::Arrow { .. } | K::Trident => (0.5, 0.13),
+                K::Snowball | K::Egg | K::EnderPearl | K::LlamaSpit | K::Potion { .. } => {
+                    (0.25, 0.2125)
+                }
+                K::SmallFireball | K::ShulkerBullet { .. } | K::WitherSkull { .. } => {
+                    (0.3125, 0.265_625)
+                }
+                K::WindCharge | K::BreezeWindCharge => (0.3125, 0.0),
+                K::LargeFireball { .. } => (1.0, 0.85),
+            };
+            g.hitbox(
+                at(p.previous, p.position),
+                (size, size),
+                eye,
+                false,
+                (p.pitch, p.yaw),
+            );
+        }
+        for t in &self.tridents {
+            g.hitbox(
+                at(t.previous, t.position),
+                (0.5, 0.5),
+                0.13,
+                false,
+                (t.pitch, t.yaw),
+            );
+        }
+        for r in &self.rockets {
+            // Projectile.updateRotation: the look follows the motion.
+            let v = r.velocity;
+            let yaw = v.x.atan2(v.z).to_degrees() as f32;
+            let pitch = v.y.atan2(v.x.hypot(v.z)).to_degrees() as f32;
+            g.hitbox(
+                at(r.previous, r.position),
+                (0.25, 0.25),
+                0.2125,
+                false,
+                (pitch, yaw),
+            );
+        }
+        for h in self
+            .hook
+            .iter()
+            .map(|h| (h.previous, h.position))
+            .chain(self.remote_hooks.iter().map(|h| (h.previous, h.position)))
+        {
+            g.hitbox(at(h.0, h.1), (0.25, 0.25), 0.2125, false, (0.0, 0.0));
+        }
+        for b in &self.bolts {
+            g.hitbox(b.at, (0.0, 0.0), 0.0, false, (0.0, 0.0));
+        }
+        // The dragon: 16 by 8, a living entity; its parts follow.
+        if let Some(d) = &self.dragon {
+            g.hitbox(
+                at(d.previous, d.position),
+                (16.0, 8.0),
+                6.8,
+                true,
+                (0.0, d.yaw),
+            );
+        }
         // The dragon's parts.
         for (id, b) in self.special_targets() {
             if (super::dragon::SPECIAL..super::dragon::SPECIAL + 8).contains(&id) {
@@ -828,3 +982,12 @@ impl Game<'_> {
         g
     }
 }
+
+/// The (x, y) rotations whose view vector is the step of a direction.
+fn step_view(step: [i32; 3]) -> (f32, f32) {
+    let [x, y, z] = step.map(f64::from);
+    (
+        (-y).asin().to_degrees() as f32,
+        (-x.atan2(z)).to_degrees() as f32,
+    )
+}

crates/horizon-client/src/game/dedicated.rs

@@ -24,6 +24,7 @@ use horizon_client::{
 use horizon_protocol::text::translatable;
 use horizon_world::nbt::{JavaString, Tag};
 use std::{
+    io::Write,
     path::PathBuf,
     sync::{Arc, Mutex, OnceLock, mpsc},
     time::{Duration, Instant},
@@ -89,7 +90,9 @@ fn log_from(thread: &str, level: &str, message: &str) {
         }
     });
     // Log4j's %d{HH:mm:ss}: the local time, as in logs/latest.log.
-    println!(
+    // The launcher can close its stdout pipe while the server keeps running.
+    let _ = writeln!(
+        std::io::stdout().lock(),
         "[{}] [{thread}/{level}]: {message}",
         chrono::Local::now().format("%H:%M:%S")
     );
@@ -618,6 +621,22 @@ impl Game<'_> {
                 log_ips: props.log_ips,
             }),
             resource_pack: props.resource_pack.clone(),
+            // DedicatedServer.serverLinks: `bug-report-link` as the only link
+            // (ServerLinks.KnownLinkType.BUG_REPORT is id 0).
+            server_links: if props.bug_report_link.is_empty() {
+                Vec::new()
+            } else if super::server_links::valid_untrusted_uri(&props.bug_report_link) {
+                vec![horizon_protocol::packets::configuration::ServerLink {
+                    kind: horizon_protocol::packets::configuration::ServerLinkKind::Known(0),
+                    link: props.bug_report_link.clone(),
+                }]
+            } else {
+                log(
+                    "WARN",
+                    &format!("Failed to parse bug link {}", props.bug_report_link),
+                );
+                Vec::new()
+            },
         };
         let config = HubConfig {
             default_game_mode: game_mode,
@@ -654,6 +673,9 @@ impl Game<'_> {
         // DedicatedServer.initServer ends with saveEverything(false, true, true).
         self.save_game()?;
         self.log_saved_levels();
+        if let Some(host) = self.lan.as_mut() {
+            host.hub.entity_range_percent = props.entity_broadcast_range_percentage;
+        }
         let mut state = ServerState {
             lists,
             console,
@@ -1308,3 +1330,110 @@ fn png_size(bytes: &[u8]) -> Option<(u32, u32)> {
     let h = u32::from_be_bytes(bytes[20..24].try_into().ok()?);
     Some((w, h))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{capture_log, log, log_from};
+    use std::{
+        fs,
+        io::{self, BufRead, BufReader, Read, Write},
+        process::{Command, Stdio},
+        time::{SystemTime, UNIX_EPOCH},
+    };
+
+    const LOGIN: &str = "Player[/127.0.0.1:0] logged in with entity id 2 at (0.5, 115.0, 0.5)";
+    const WARNING: &str = "Authentication warning";
+    const READY: &str = "horizon-console-log-ready\n";
+    const CHILD_HOME: &str = "HORIZON_TEST_CONSOLE_LOG_HOME";
+
+    fn assert_log_lines(text: &str) {
+        let expected = [
+            format!("] [Server thread/INFO]: {LOGIN}"),
+            format!("] [User Authenticator #1/WARN]: {WARNING}"),
+        ];
+        assert_eq!(text.lines().count(), expected.len());
+        for (line, suffix) in text.lines().zip(expected) {
+            assert!(line.starts_with('['));
+            assert!(chrono::NaiveTime::parse_from_str(&line[1..9], "%H:%M:%S").is_ok());
+            assert_eq!(&line[9..], suffix);
+        }
+    }
+
+    #[test]
+    fn console_logging_survives_closed_stdout() {
+        if let Some(home) = std::env::var_os(CHILD_HOME) {
+            horizon_client::logging::init(std::path::Path::new(&home), "Server thread");
+            // Let the parent close the real stdout pipe only after libtest's startup output.
+            io::stdout().write_all(READY.as_bytes()).unwrap();
+            io::stdout().flush().unwrap();
+            io::stdin().read_exact(&mut [0]).unwrap();
+            std::thread::Builder::new()
+                .name("Server thread".into())
+                .spawn(|| {
+                    let captured = capture_log(|| {
+                        log("INFO", LOGIN);
+                        log_from("User Authenticator #1", "WARN", WARNING);
+                    });
+                    assert_eq!(captured, [LOGIN, WARNING]);
+                    horizon_client::logging::flush();
+                })
+                .unwrap()
+                .join()
+                .unwrap();
+            // Libtest's final status also writes to stdout; only the game logger is under test.
+            std::process::exit(0);
+        }
+
+        for closed_stdout in [false, true] {
+            let unique = SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap()
+                .as_nanos();
+            let home = std::env::temp_dir().join(format!(
+                "horizon-console-log-test-{}-{unique}",
+                std::process::id()
+            ));
+            fs::create_dir(&home).unwrap();
+            let mut child = Command::new(std::env::current_exe().unwrap())
+                .args([
+                    "--exact",
+                    "game::dedicated::tests::console_logging_survives_closed_stdout",
+                    "--nocapture",
+                ])
+                .env(CHILD_HOME, &home)
+                .stdin(Stdio::piped())
+                .stdout(Stdio::piped())
+                .stderr(Stdio::piped())
+                .spawn()
+                .unwrap();
+            let mut stdout = BufReader::new(child.stdout.take().unwrap());
+            loop {
+                let mut line = String::new();
+                assert!(
+                    stdout.read_line(&mut line).unwrap() > 0,
+                    "child was not ready"
+                );
+                if line.ends_with(READY) {
+                    break;
+                }
+            }
+            if closed_stdout {
+                drop(stdout); // No reader remains: the next console write gets EPIPE.
+            } else {
+                child.stdout = Some(stdout.into_inner());
+            }
+            child.stdin.take().unwrap().write_all(&[1]).unwrap();
+            let output = child.wait_with_output().unwrap();
+            assert!(
+                output.status.success(),
+                "closed_stdout={closed_stdout}: {}",
+                String::from_utf8_lossy(&output.stderr)
+            );
+            if !closed_stdout {
+                assert_log_lines(std::str::from_utf8(&output.stdout).unwrap());
+            }
+            assert_log_lines(&fs::read_to_string(home.join("logs/latest.log")).unwrap());
+            fs::remove_dir_all(home).unwrap();
+        }
+    }
+}

crates/horizon-client/src/game/deflect.rs

@@ -120,6 +120,11 @@ impl Game<'_> {
         p.guest = guest;
         // Not into the one who turned it on its way out.
         p.left_owner = false;
+        // `AbstractHurtingProjectile.onDeflection` by an attack, and the
+        // `needsSync` that `AIM_DEFLECT` sets: a server's players see it turn
+        // at once, not at the fireball's next update ten ticks later.
+        p.acceleration = 0.1;
+        p.needs_sync = true;
         self.reset_attack_strength();
         self.swing_arm();
         let from = self

crates/horizon-client/src/game/dispenser.rs

@@ -982,7 +982,7 @@ impl Game<'_> {
             | "minecraft:lingering_potion" => {
                 let mut shot = Projectile::new(ProjectileKind::Snowball, at, None);
                 shot.shoot(&mut own, dir, power, uncertainty);
-                self.launch_thrown(one, at, shot.velocity);
+                self.launch_thrown(one, at, shot.velocity, None);
             }
             "minecraft:firework_rocket" => {
                 let mut shot = Projectile::new(ProjectileKind::Snowball, at, None);
@@ -1034,7 +1034,7 @@ impl Game<'_> {
                     a.pickup = horizon_client::arrows::Pickup::Allowed;
                 }
                 shot.shoot(&mut own, dir, power, uncertainty);
-                self.creatures.projectiles.push(shot);
+                self.add_projectile(shot);
             }
         }
     }

crates/horizon-client/src/game/dragon.rs

@@ -291,11 +291,11 @@ pub(super) enum FightWho {
 }
 /// A player in the End as the dragon sees it.
 #[derive(Clone, Copy, Debug)]
-struct FightPlayer {
-    who: FightWho,
-    position: Vec3,
-    bounds: Aabb,
-    alive: bool,
+pub(super) struct FightPlayer {
+    pub(super) who: FightWho,
+    pub(super) position: Vec3,
+    pub(super) bounds: Aabb,
+    pub(super) alive: bool,
     creative: bool,
     spectator: bool,
 }
@@ -693,7 +693,7 @@ impl Game<'_> {
     }
     /// The players in the level the dragon sees (`level.players()`): the
     /// window's own, then every guest in the level.
-    fn fight_players(&self) -> Vec<FightPlayer> {
+    pub(super) fn fight_players(&self) -> Vec<FightPlayer> {
         let mut out = Vec::new();
         if let Some(p) = self.player.as_ref() {
             out.push(FightPlayer {
@@ -722,7 +722,7 @@ impl Game<'_> {
     }
     /// Run `f` as the fight's player `who` (a guest's turn, its knockback
     /// sent to its client).
-    fn as_fight_player(&mut self, who: FightWho, f: impl FnOnce(&mut Self)) {
+    pub(super) fn as_fight_player(&mut self, who: FightWho, f: impl FnOnce(&mut Self)) {
         match who {
             FightWho::Host => f(self),
             FightWho::Guest(conn) => {
@@ -828,8 +828,10 @@ impl Game<'_> {
                 continue;
             }
             let time = self.world.random.next_int_bound(100_000).unwrap_or(0);
+            // EndCrystal's constructor takes an id from the entity counter.
+            self.next_entity += 1;
             self.crystals.push(Crystal {
-                id: 0,
+                id: self.next_entity,
                 position: at,
                 show_bottom: true,
                 time,
@@ -1566,6 +1568,7 @@ impl Game<'_> {
                         age: 0,
                         duration: 200,
                         from_dragon: true,
+                        potion: None,
                     });
                 }
             }
@@ -2078,12 +2081,18 @@ impl Game<'_> {
                     age: 0,
                     duration: 600,
                     from_dragon: false,
+                    potion: None,
                 });
-                self.audio.play(
-                    "minecraft:entity.dragon_fireball.explode",
-                    Some([next.x, next.y, next.z]),
-                    1.0,
-                    1.0,
+                // DragonFireball.onHit: level event 2006 (the burst of dragon
+                // breath and the explosion sound) at its block position.
+                self.level_event_at(
+                    2006,
+                    [
+                        next.x.floor() as i32,
+                        next.y.floor() as i32,
+                        next.z.floor() as i32,
+                    ],
+                    1,
                 );
                 return false;
             }
@@ -2110,6 +2119,10 @@ impl Game<'_> {
         let mut harmed: Vec<(FightWho, f32)> = Vec::new();
         let mut clouds = std::mem::take(&mut self.breath_clouds);
         clouds.retain_mut(|c| {
+            // Lingering potions' clouds tick with the potions.
+            if c.potion.is_some() {
+                return true;
+            }
             c.age += 1;
             if c.age >= c.duration {
                 return false;
@@ -2157,11 +2170,14 @@ impl Game<'_> {
     }
     /// Damage from the dragon, which is its causing entity
     /// (`DamageSources.mobAttack(dragon)`, `indirectMagic(cloud, dragon)`): the
-    /// death message names it.
+    /// death message names it, or the cloud once the dragon is gone.
     fn dragon_hurts_player(&mut self, damage_type: &str, amount: f32) {
         if let Some(id) = self.dragon.as_ref().map(|d| d.id) {
             let name = Text::translate("entity.minecraft.ender_dragon", &[]);
             self.note_named_attacker(damage_type, id, name);
+        } else if damage_type == "minecraft:indirect_magic" {
+            let name = Text::translate("entity.minecraft.area_effect_cloud", &[]);
+            self.note_direct_entity(damage_type, name);
         }
         self.hurt_player_by(damage_type, amount);
     }
@@ -2254,8 +2270,22 @@ pub(super) struct Breath {
     pub(super) at: [f64; 3],
     pub(super) radius: f32,
     pub(super) age: i32,
-    duration: i32,
-    from_dragon: bool,
+    pub(super) duration: i32,
+    pub(super) from_dragon: bool,
+    /// A lingering potion's cloud (`ThrownLingeringPotion`): what it applies.
+    pub(super) potion: Option<super::potions::PotionCloud>,
+}
+impl Breath {
+    /// `AreaEffectCloud.isWaiting`: before its wait time (20 ticks, 10 for a
+    /// lingering potion's).
+    pub(super) fn waiting(&self) -> bool {
+        self.age
+            < if self.potion.is_some() {
+                super::potions::LINGERING_WAIT
+            } else {
+                20
+            }
+    }
 }
 impl Game<'_> {
     /// `EnderDragonRenderer` and `EnderDragonModel.setupAnim`.
@@ -2598,7 +2628,9 @@ impl Game<'_> {
     }
     pub(super) fn fight_ready(&mut self) -> bool {
         self.load_fight();
-        self.fight.loaded
+        // spawnExitPortal runs from scanState and the dragon's death, both
+        // only with players in the fight.
+        self.fight.loaded && self.fight.players
     }
     pub(super) fn exit_portal(&self) -> Option<[i32; 3]> {
         self.fight.exit_portal
@@ -2830,8 +2862,11 @@ impl Game<'_> {
             return false;
         }
         let time = self.world.random.next_int_bound(100_000).unwrap_or(0);
+        // EndCrystal's constructor takes an id from the entity counter, so
+        // the crystal is an entity a command can name (`@e[type=end_crystal]`).
+        self.next_entity += 1;
         self.crystals.push(Crystal {
-            id: 0,
+            id: self.next_entity,
             position: Vec3::new(x + 0.5, y, z + 0.5),
             show_bottom: false,
             time,
@@ -2848,6 +2883,21 @@ impl Game<'_> {
         self.swing_arm();
         true
     }
+    /// `EndCrystal.kill` (`/kill`): the crystal is removed, without a blast
+    /// (`Entity.kill` does not hurt it).
+    pub(super) fn kill_crystal(&mut self, id: u32) {
+        if let Some(i) = self.crystals.iter().position(|c| c.id == id) {
+            self.destroy_crystal(i, None, CrystalDamage::Explosion);
+        }
+    }
+    /// `EnderDragon.kill` (`/kill`): `Entity.kill` removes the entity, it
+    /// does not hurt it (the dragon flies its death flight when its health
+    /// runs out).
+    pub(super) fn kill_dragon(&mut self, id: u32) {
+        if self.dragon.as_ref().is_some_and(|d| d.id == id) {
+            self.dragon = None;
+        }
+    }
     /// Any entity touching `room` (`Level.getEntities(null, box)`).
     fn entity_in(&self, room: Aabb) -> bool {
         let touches = |lo: Vec3, hi: Vec3| {

crates/horizon-client/src/game/enchant_effects.rs

@@ -3,10 +3,14 @@
 //! unbreaking (`minecraft:item_damage`), sharpness/smite/bane and power
 //! (`minecraft:damage`), knockback, fire aspect, infinity (`minecraft:ammo_use`),
 //! thorns (`minecraft:post_attack`), mending (`minecraft:repair_with_xp`) and
-//! the armor attribute effects (respiration, depth strider, ...).
+//! the armor attribute effects (respiration, depth strider, ...) and Soul
+//! Speed's `location_changed` and `tick` effects.
 use super::Game;
-use horizon_client::{enchant::EffectContext, items::ItemStack};
-use horizon_core::random::RandomSource;
+use horizon_client::{
+    enchant::{EffectContext, Enchantments, level_value},
+    items::ItemStack,
+};
+use horizon_core::{position::BlockPos, random::RandomSource};
 
 /// Where Mending found a damaged item (`EnchantedItemInUse.inSlot`).
 #[derive(Clone, Copy)]
@@ -458,6 +462,134 @@ impl Game<'_> {
         }
         ignite
     }
+    /// Soul Speed (`data/minecraft/enchantment/soul_speed.json`), the parts of
+    /// `Enchantment.runLocationChangedEffects` and `tick` that file uses. The
+    /// `location_changed` effects run when the player enters a new block, lands,
+    /// or its boots change:
+    /// - the speed and movement efficiency modifiers turn on over a soul speed
+    ///   block (not flying, not riding) and stay on while airborne, then off
+    ///   (`enchantment_active_check`);
+    /// - the boots lose 1 durability with a 4% chance when on such a block.
+    ///
+    /// Every fifth tick the player walking on one also gets a soul particle
+    /// (returned as its position and velocity, for the caller to show or send
+    /// to the players around) and sometimes a sound. Runs for the window's own
+    /// player and for each guest on the server (`guest_server_tick`); a remote
+    /// client leaves it to its server.
+    pub(super) fn tick_soul_speed(&mut self) -> Option<([f64; 3], [f64; 3])> {
+        const ID: &str = "minecraft:soul_speed";
+        let player = self.player.as_mut()?;
+        if player.client_side {
+            return None;
+        }
+        let level = self.armor[3]
+            .as_ref()
+            .map_or(0, |s| s.enchantment_level(ID));
+        let position = player.position;
+        let (on_ground, flying) = (player.ground.on_ground, player.flying);
+        let moved = position.subtract(player.old_position);
+        let (tick, width) = (player.health.tick_count, player.dimensions.width);
+        let fx = &mut player.location_effects;
+        let on_soul = fx.on_soul_speed_block;
+        let block = BlockPos::containing(position);
+        let changed_block = fx.block.replace(block) != Some(block);
+        let landed = std::mem::take(&mut fx.landed);
+        // Changed boots: `stopLocationBasedEffects`, then the effects run again.
+        let equipped = std::mem::replace(&mut fx.boots_level, level) != level;
+        let was_active = fx.applied_level;
+        let mut active = was_active > 0 && !equipped;
+        let mut wear = false;
+        if level > 0 && (changed_block || landed || equipped) {
+            let riding = self.riding.is_some();
+            let wanted = !riding && !flying && (on_soul || (active && !on_ground));
+            active = wanted;
+            // `random_chance` is the first term of the wear's `all_of`: it
+            // draws from the level random before the block is looked at.
+            let roll = self.world.random.next_float() < 0.04;
+            wear = roll && on_ground && on_soul;
+        }
+        fx.applied_level = if active { level } else { 0 };
+        // `Entity.getKnownMovement` horizontal speed of at least 1.0E-5.
+        let walking = moved.x * moved.x + moved.z * moved.z >= 1.0e-10;
+        let tick_effects = level > 0 && !flying && on_ground && walking && on_soul && tick % 5 == 0;
+        // The attribute effects were applied to the player before: swap them.
+        if was_active > 0 && (!active || equipped) {
+            for (attribute, id, _, op) in
+                soul_speed_modifiers(&self.res.stations().enchantments, was_active)
+            {
+                let _ = player.set_modifier(&attribute, &id, 0.0, &op, false);
+            }
+        }
+        if active && (was_active == 0 || equipped) {
+            for (attribute, id, amount, op) in
+                soul_speed_modifiers(&self.res.stations().enchantments, level)
+            {
+                let _ = player.set_modifier(&attribute, &id, amount, &op, true);
+            }
+        }
+        if wear && !self.creative {
+            self.wear_boots(1);
+        }
+        if level == 0 {
+            return None;
+        }
+        let r = &mut self.world.random;
+        // `spawn_particles`: in the bounding box, 0.1 above the feet, thrown
+        // back against the movement (-0.2) and up (0.1).
+        let particle = tick_effects.then(|| {
+            let x = position.x + (r.next_double() - 0.5) * f64::from(width);
+            let z = position.z + (r.next_double() - 0.5) * f64::from(width);
+            (
+                [x, position.y + 0.1, z],
+                [moved.x * -0.2, 0.1, moved.z * -0.2],
+            )
+        });
+        // `play_sound`: its `random_chance` (35%) comes first in its `all_of`,
+        // so the level random is drawn every tick the boots are worn; volume
+        // 0.6, pitch 0.6 to 1.0.
+        if r.next_float() < 0.35 && tick_effects {
+            let pitch = r.next_float() * 0.4 + 0.6;
+            self.audio.play(
+                "minecraft:particle.soul_escape",
+                Some([position.x, position.y, position.z]),
+                0.6,
+                pitch,
+            );
+        }
+        particle
+    }
+    /// `ItemStack.hurtAndBreak` on the worn boots (`change_item_damage`):
+    /// Unbreaking applies, and they break when worn out.
+    fn wear_boots(&mut self, amount: u32) {
+        let Some(stack) = self.armor[3].clone() else {
+            return;
+        };
+        let loss = self.durability_loss(&stack, amount);
+        let max = self
+            .res
+            .items()
+            .get(&stack.item)
+            .map_or(0, |info| info.max_damage);
+        if max == 0 {
+            return;
+        }
+        let Some(boots) = self.armor[3].as_mut() else {
+            return;
+        };
+        boots.damage += loss;
+        if boots.damage >= max {
+            self.armor[3] = None;
+            if let Some(eye) = self.eye_position() {
+                self.audio.play(
+                    "minecraft:entity.item.break",
+                    Some(eye),
+                    0.8,
+                    0.8 + self.world.random.next_float() * 0.4,
+                );
+            }
+            self.apply_equipment();
+        }
+    }
     /// Enchantment attribute modifiers of worn armor (respiration, depth strider...).
     /// Each piece's modifier id ends with its slot (`EnchantmentAttributeEffect.idForSlot`),
     /// so the same enchantment on two pieces stacks instead of replacing itself.
@@ -481,3 +613,28 @@ impl Game<'_> {
         self.potions.enchant_modifiers = wanted;
     }
 }
+
+/// Soul Speed's `attribute` effects at `level` (attribute, id, amount, operation),
+/// the id taking the boots slot like `EnchantmentAttributeEffect.idForSlot`.
+fn soul_speed_modifiers(
+    enchantments: &Enchantments,
+    level: u32,
+) -> Vec<(String, String, f64, String)> {
+    let Some(e) = enchantments.get("minecraft:soul_speed") else {
+        return Vec::new();
+    };
+    e.effects["minecraft:location_changed"][0]["effect"]["effects"]
+        .as_array()
+        .into_iter()
+        .flatten()
+        .filter(|a| a["type"] == "minecraft:attribute")
+        .map(|a| {
+            (
+                a["attribute"].as_str().unwrap_or("").to_owned(),
+                format!("{}/feet", a["id"].as_str().unwrap_or("")),
+                f64::from(level_value(&a["amount"], level)),
+                a["operation"].as_str().unwrap_or("add_value").to_owned(),
+            )
+        })
+        .collect()
+}

crates/horizon-client/src/game/end.rs

@@ -19,7 +19,7 @@ use horizon_core::{
 use std::{collections::HashMap, sync::Arc};
 
 /// ServerLevel.END_SPAWN_POINT.
-const END_SPAWN: [i32; 3] = [100, 50, 0];
+pub(super) const END_SPAWN: [i32; 3] = [100, 50, 0];
 /// EnderDragonFight gateway ring radius and height.
 const GATEWAY_RADIUS: f64 = 96.0;
 const GATEWAY_Y: i32 = 75;
@@ -253,10 +253,17 @@ impl Game<'_> {
         out
     }
 
-    /// LightmapRenderStateExtractor: End flashes add to the sky light factor.
+    /// LightmapRenderStateExtractor: End flashes add to the sky light factor
+    /// unless Hide Lightning Flashes is on (the sky sprite is not gated), a
+    /// third of it under a boss bar's world fog.
     pub(super) fn end_flash_sky(&self, sky: &mut horizon_client::environment::Sky, partial: f64) {
-        if self.dim == Dim::End {
-            sky.sky_light_factor += self.end.flash.intensity(partial as f32);
+        if self.dim == Dim::End && !self.settings.file.bool("hideLightningFlashes") {
+            let intensity = self.end.flash.intensity(partial as f32);
+            sky.sky_light_factor += if self.boss_overlay.should_create_world_fog() {
+                intensity / 3.0
+            } else {
+                intensity
+            };
         }
     }
 

crates/horizon-client/src/game/entity_culling.rs

@@ -60,12 +60,27 @@ impl Game<'_> {
     }
 }
 
+impl Game<'_> {
+    /// Entity.setViewScale (LevelExtractor.extractVisibleEntities): the entity
+    /// distance option times the render distance's boost — 1 at 8 chunks, 2.5
+    /// at 20 or more. The render distance is the client setting, capped by
+    /// the server's view distance when connected
+    /// (Options.getEffectiveRenderDistance).
+    pub(super) fn view_scale(&self) -> f64 {
+        let distance = match &self.remote {
+            Some(r) => self.settings.render_distance.min(r.view_distance),
+            None => self.settings.render_distance,
+        };
+        (f64::from(distance) / 8.0).clamp(1.0, 2.5) * f64::from(self.settings.entity_distance)
+    }
+}
+
 /// Entity.shouldRenderAtSqrDistance's default range: 64 times the bounding
-/// box's mean edge, scaled by the entity distance option.
-pub(super) fn default_range(size: glam::DVec3, view_scale: f32) -> f64 {
+/// box's mean edge, scaled by the view scale.
+pub(super) fn default_range(size: glam::DVec3, view_scale: f64) -> f64 {
     let edge = (size.x + size.y + size.z) / 3.0;
     let edge = if edge.is_nan() { 1.0 } else { edge };
-    edge * 64.0 * f64::from(view_scale)
+    edge * 64.0 * view_scale
 }
 
 impl Game<'_> {

crates/horizon-client/src/game/explosion.rs

@@ -572,16 +572,16 @@ impl Game<'_> {
         let pitch = (1.0 + (client_float() - client_float()) * 0.2) * 0.7;
         self.audio
             .play("minecraft:entity.generic.explode", Some(center), 4.0, pitch);
-        let block_count = if interaction == BlockInteraction::Keep {
-            0
-        } else {
-            targets.len()
-        };
+        // ServerLevel.explode sends toBlow.size() whatever the interaction, and
+        // `ServerExplosion.isSmall` also covers an explosion that keeps blocks.
+        let block_count = targets.len();
+        let small = radius < 2.0 || interaction == BlockInteraction::Keep;
         let (world, facts) = (&self.world, self.res.facts());
-        self.particles.explosion(center, radius, block_count, &|b| {
-            facts.is_air(world.block(b[0], b[1], b[2]))
-        });
-        self.lan_explode(center, radius, block_count);
+        self.particles
+            .explosion(center, small, block_count, radius, &|b| {
+                facts.is_air(world.block(b[0], b[1], b[2]))
+            });
+        self.lan_explode(center, small, radius, block_count);
         Ok(())
     }
     /// `BlockBehaviour.onExplosionHit` (TNT: `wasExploded` primes a short fuse).
@@ -598,6 +598,11 @@ impl Game<'_> {
         }
         let name = self.res.facts().get(state).name.clone();
         let is_tnt = &*name == "minecraft:tnt";
+        // CreakingHeartBlock.onExplosionHit: its creaking dies (no
+        // experience, as Horizon does not track a TNT's owner).
+        if &*name == "minecraft:creaking_heart" {
+            self.creaking_heart_broken(pos, false);
+        }
         // Block.onExplosionHit: the drops copy from the block entity, which
         // then spills its contents as the block turns to air.
         let key = (pos[0], pos[1], pos[2]);

crates/horizon-client/src/game/falling_damage.rs

@@ -64,6 +64,25 @@ impl Game<'_> {
                     pos: BlockPos::new(pos[0], pos[1], pos[2]),
                     data: 0,
                 });
+            } else if self
+                .res
+                .facts()
+                .get(block.state)
+                .name
+                .starts_with("minecraft:suspicious_")
+            {
+                // BrushableBlock.onBrokenAfterFall.
+                let at = BlockPos::new(pos[0], pos[1], pos[2]);
+                self.level_events.push(LevelEvent::LevelEvent {
+                    id: 2001,
+                    pos: at,
+                    data: block.state.0 as i32,
+                });
+                self.level_events.push(LevelEvent::GameEvent {
+                    pos: at,
+                    event: "minecraft:block_destroy",
+                    state: None,
+                });
             }
             return;
         }

crates/horizon-client/src/game/fangs.rs

@@ -7,12 +7,13 @@ use std::sync::Arc;
 
 #[derive(Clone, Debug)]
 pub(super) struct Fangs {
-    pos: [f64; 3],
-    yaw: f32,
+    pub id: u32,
+    pub pos: [f64; 3],
+    pub yaw: f32,
     warmup: i32,
-    life: i32,
+    pub life: i32,
     owner: u32,
-    started: bool,
+    pub started: bool,
 }
 #[derive(Default)]
 pub(super) struct FangState {
@@ -21,6 +22,11 @@ pub(super) struct FangState {
 }
 impl Game<'_> {
     pub(super) fn add_fangs(&mut self, at: [f64; 3], yaw: f32, delay: i32, owner: u32) {
+        self.next_entity += 1;
+        self.insert_fangs(self.next_entity, at, yaw, delay, owner);
+    }
+
+    pub(super) fn insert_fangs(&mut self, id: u32, at: [f64; 3], yaw: f32, delay: i32, owner: u32) {
         if self.fangs.model.is_none() {
             self.fangs.model = horizon_client::mobs::load_model(
                 &self.options.resources,
@@ -29,6 +35,7 @@ impl Game<'_> {
             .map(Arc::new);
         }
         self.fangs.list.push(Fangs {
+            id,
             pos: at,
             yaw,
             warmup: delay,
@@ -37,6 +44,30 @@ impl Game<'_> {
             started: false,
         });
     }
+    /// `EvokerFangs.handleEntityEvent`: only event 4 starts a client attack.
+    pub(super) fn remote_fangs_event(&mut self, id: u32, event: i8) {
+        if event == 4
+            && let Some(f) = self.fangs.list.iter_mut().find(|f| f.id == id)
+        {
+            f.started = true;
+            self.audio.play_unshared(
+                "minecraft:entity.evoker_fangs.attack",
+                Some(f.pos),
+                1.0,
+                1.0,
+            );
+        }
+    }
+
+    /// `EvokerFangs.tick`: clients only advance animation, never damage or discard.
+    pub(super) fn tick_remote_fangs(&mut self) {
+        for f in &mut self.fangs.list {
+            if f.started {
+                f.life -= 1;
+            }
+        }
+    }
+
     /// `EvokerFangs.tick`.
     pub(super) fn tick_fangs(&mut self) {
         let mut list = std::mem::take(&mut self.fangs.list);
@@ -50,7 +81,8 @@ impl Game<'_> {
             }
             if !f.started {
                 f.started = true;
-                self.audio.play(
+                self.lan_entity_event(f.id as i32, 4, f.pos);
+                self.audio.play_unshared(
                     "minecraft:entity.evoker_fangs.attack",
                     Some(f.pos),
                     1.0,
@@ -71,12 +103,23 @@ impl Game<'_> {
         let b = horizon_core::geometry::Aabb::new(lo, hi);
         // Every player in the box, the server's players too.
         let pos = f.pos;
+        // `EvokerFangs.dealDamageTo`: indirectMagic(fangs, owner) while the
+        // owner lives, plain magic (nobody to name) once it is gone.
+        let owner = self
+            .mobs
+            .iter()
+            .any(|m| m.id == f.owner && m.alive())
+            .then_some(f.owner);
         let bite = move |g: &mut Self| {
             if let Some(p) = g.player_view()
                 && p.alive
                 && p.bounds.intersects(b)
             {
-                g.mob_hits_player_kind(6.0, pos, "minecraft:indirect_magic");
+                let kind = match owner {
+                    Some(_) => "minecraft:indirect_magic",
+                    None => "minecraft:magic",
+                };
+                g.mob_hits_player_caused(6.0, pos, kind, owner);
             }
         };
         bite(self);

crates/horizon-client/src/game/fireworks.rs

@@ -23,7 +23,7 @@ pub(super) struct Rocket {
     /// The entity id a server tracks it by (0 until it is tracked).
     pub id: u32,
     pub(super) position: Vec3,
-    previous: Vec3,
+    pub(super) previous: Vec3,
     pub(super) velocity: Vec3,
     life: i32,
     lifetime: i32,

crates/horizon-client/src/game/fishing.rs

@@ -30,8 +30,8 @@ enum State {
 pub(super) struct Hook {
     /// Its entity id, which a server's players track it under.
     id: u32,
-    position: Vec3,
-    previous: Vec3,
+    pub(super) position: Vec3,
+    pub(super) previous: Vec3,
     velocity: Vec3,
     state: State,
     life: i32,
@@ -433,6 +433,8 @@ impl Game<'_> {
         let options = ParticleOptions::simple(kind);
         self.particles
             .send_particles(&options, at, spread, speed, count);
+        // The players a server serves are sent them too.
+        self.lan_send_particles(&options, at, spread, speed, count);
     }
     /// `FishingHook.tick`.
     pub(super) fn tick_fishing(&mut self) {
@@ -770,8 +772,8 @@ impl Game<'_> {
 pub(super) struct RemoteHook {
     id: u32,
     owner: u32,
-    position: Vec3,
-    previous: Vec3,
+    pub(super) position: Vec3,
+    pub(super) previous: Vec3,
 }
 
 impl Hook {

crates/horizon-client/src/game/frames.rs

@@ -311,8 +311,9 @@ impl Game<'_> {
         let sprites = &self.gui.atlas.sprites;
         let mut maps: Vec<(i32, glam::Mat4, u32)> = Vec::new();
         let mut items: Vec<(ItemStack, u32, glam::Mat4, u8)> = Vec::new();
-        // ItemFrame.shouldRenderAtSqrDistance: 1024 blocks at 100%.
-        let range = 16.0 * 64.0 * f64::from(self.settings.entity_distance);
+        // ItemFrame.shouldRenderAtSqrDistance: 1024 blocks at a view scale
+        // of 1.
+        let range = 16.0 * 64.0 * self.view_scale();
         for f in &self.item_frames {
             let entity_start = out.len();
             let map = f.item.as_ref().and_then(super::maps::map_id);
@@ -456,7 +457,7 @@ impl Game<'_> {
         }
         for (id, m, light) in maps {
             let entity_start = out.len();
-            self.map_vertices(id, m, light, out);
+            self.map_vertices(id, true, m, light, out);
             self.cull_entity_vertices(out, entity_start);
         }
     }

crates/horizon-client/src/game/initial_spawn.rs

@@ -20,7 +20,8 @@ use horizon_core::{
 };
 use horizon_world::{
     block_collision::BlockCollisionRegistry, collision_context::CollisionContext,
-    heightmap::HeightmapType, worldgen::terrain::TerrainBlockStates,
+    heightmap::HeightmapType, level::flags::UPDATE_CLIENTS, registry::BlockStateId,
+    worldgen::terrain::TerrainBlockStates,
 };
 
 /// The loaded world as the spawn searches query it.
@@ -121,33 +122,102 @@ impl Game<'_> {
         }
         Ok(Some([ox * 16 + 8, height, oz * 16 + 8]))
     }
+    /// MinecraftServer.setInitialSpawn's bonus chest: BonusChestFeature.place
+    /// in the spawn chunk, a chest with the spawn bonus loot and a torch on
+    /// each side that can hold one, on the first free column of a shuffled
+    /// walk over the chunk. Skipped while the chunk is not loaded.
+    pub(super) fn place_bonus_chest(&mut self, origin: [i32; 3]) -> Result<()> {
+        use horizon_client::containers::BlockEntity;
+        let (cx, cz) = (origin[0] >> 4, origin[2] >> 4);
+        let registry = &self.pack.assets.registry;
+        let (Some(chest), Some(torch)) = (
+            registry.default_state("minecraft:chest"),
+            registry.default_state("minecraft:torch"),
+        ) else {
+            return Ok(());
+        };
+        if !self.streaming.is_lit(cx, cz) {
+            return Ok(());
+        }
+        // `level.getRandom()`. Util.toShuffledList of the chunk's x and z.
+        let random = &mut self.world.random;
+        let mut shuffled = |min: i32| -> [i32; 16] {
+            let mut values: [i32; 16] = std::array::from_fn(|i| min + i as i32);
+            for end in (2..=16usize).rev() {
+                let other = random.next_int_bound(end as i32).unwrap_or(0) as usize;
+                values.swap(end - 1, other);
+            }
+            values
+        };
+        let (xs, zs) = (shuffled(cx * 16), shuffled(cz * 16));
+        for x in xs {
+            for z in zs {
+                let y = self
+                    .spawn_columns()
+                    .height(HeightmapType::MotionBlockingNoLeaves, x, z);
+                if self.world.block(x, y, z) != self.world.air && !self.collision_empty([x, y, z]) {
+                    continue;
+                }
+                self.set_block_clients([x, y, z], chest)?;
+                let seed = self.world.random.next_long();
+                self.world
+                    .block_entities
+                    .insert((x, y, z), BlockEntity::Chest(Vec::new()));
+                self.load_block_entity_nbt(
+                    [x, y, z],
+                    &format!(
+                        "{{LootTable:\"minecraft:chests/spawn_bonus_chest\",LootTableSeed:{seed}L}}"
+                    ),
+                );
+                for [dx, dz] in [[0, -1], [1, 0], [0, 1], [-1, 0]] {
+                    let at = [x + dx, y, z + dz];
+                    let survives = self.with_level(|b, level, ticks| {
+                        b.can_survive(level, ticks, BlockPos::new(at[0], at[1], at[2]), torch)
+                    });
+                    if survives {
+                        self.set_block_clients(at, torch)?;
+                    }
+                }
+                return Ok(());
+            }
+        }
+        Ok(())
+    }
+    /// `Level.setBlock(pos, state, UPDATE_CLIENTS)`: no neighbour updates.
+    fn set_block_clients(&mut self, pos: [i32; 3], state: BlockStateId) -> Result<()> {
+        self.with_level(|b, level, ticks| {
+            b.set_block(
+                level,
+                ticks,
+                BlockPos::new(pos[0], pos[1], pos[2]),
+                state,
+                UPDATE_CLIENTS,
+            );
+        });
+        self.process_level_events()
+    }
+    /// The block at `pos` has no collision shape.
+    fn collision_empty(&self, pos: [i32; 3]) -> bool {
+        let mut scene = SceneCollisions {
+            world: &self.world,
+            binding: self.collision,
+            subject: None,
+        };
+        self.collision
+            .collision_shape_with_context(
+                &mut scene,
+                self.world.block(pos[0], pos[1], pos[2]),
+                BlockPos::new(pos[0], pos[1], pos[2]),
+                &CollisionContext::empty(false),
+            )
+            .is_ok_and(|shape| shape.is_empty())
+    }
     /// PlayerSpawnFinder.findSpawn around the world spawn: the feet of a
     /// player who has no position yet. None while a candidate's chunk loads.
     pub(super) fn find_player_spawn(&mut self, suggestion: [i32; 3]) -> Result<Option<Vec3>> {
         let mut finder = match self.player_spawn {
             Some(finder) => finder,
-            None if self.level.game_mode == 2 => {
-                // Adventure mode: the suggestion itself.
-                let mut finder = PlayerSpawnFinder::new(suggestion, 0, |_| 0);
-                finder.next_candidate();
-                finder
-            }
-            None => {
-                let mut radius = self.ui.rules.int("respawn_radius").max(0);
-                let to_border = self
-                    .border
-                    .distance(f64::from(suggestion[0]), f64::from(suggestion[2]))
-                    .floor() as i32;
-                if to_border < radius {
-                    radius = to_border;
-                }
-                if to_border <= 1 {
-                    radius = 1;
-                }
-                PlayerSpawnFinder::new(suggestion, radius, |n| {
-                    entity_random().next_int_bound(n).unwrap_or(0)
-                })
-            }
+            None => self.spawn_finder(suggestion),
         };
         let found = loop {
             let Some(candidate) = finder.next_candidate() else {
@@ -176,6 +246,58 @@ impl Game<'_> {
         self.player_spawn = found.is_none().then_some(finder);
         Ok(found)
     }
+    /// A new PlayerSpawnFinder around `suggestion`: the respawn radius, cut
+    /// by the world border; the suggestion itself in adventure mode.
+    fn spawn_finder(&self, suggestion: [i32; 3]) -> PlayerSpawnFinder {
+        if self.level.game_mode == 2 {
+            let mut finder = PlayerSpawnFinder::new(suggestion, 0, |_| 0);
+            finder.next_candidate();
+            return finder;
+        }
+        let mut radius = self.ui.rules.int("respawn_radius").max(0);
+        let to_border = self
+            .border
+            .distance(f64::from(suggestion[0]), f64::from(suggestion[2]))
+            .floor() as i32;
+        if to_border < radius {
+            radius = to_border;
+        }
+        if to_border <= 1 {
+            radius = 1;
+        }
+        PlayerSpawnFinder::new(suggestion, radius, |n| {
+            entity_random().next_int_bound(n).unwrap_or(0)
+        })
+    }
+    /// ServerPlayer.adjustSpawnLocation for a server's new player: where
+    /// PlayerSpawnFinder.findSpawn puts their feet around the world spawn
+    /// (`spawn`, the feet there), so that players new to a world don't all
+    /// stand in one spot. Vanilla waits for each candidate's chunk; a server
+    /// tick can't, so a candidate in a chunk not loaded yet is passed over,
+    /// and `spawn` stays when the search never reaches a loaded column.
+    pub(super) fn server_player_spawn(&self, spawn: [f64; 3]) -> [f64; 3] {
+        let suggestion = spawn.map(|v| v.floor() as i32);
+        let mut finder = self.spawn_finder(suggestion);
+        while let Some(candidate) = finder.next_candidate() {
+            let (x, z) = match candidate {
+                SpawnCandidate::Column(x, z) => (x, z),
+                SpawnCandidate::Suggestion => (suggestion[0], suggestion[2]),
+            };
+            if !self.streaming.is_lit(x >> 4, z >> 4) {
+                continue;
+            }
+            let feet = match candidate {
+                SpawnCandidate::Column(x, z) => level_respawn_pos(&self.spawn_columns(), x, z)
+                    .filter(|&pos| self.player_fits(pos))
+                    .map(bottom_center),
+                SpawnCandidate::Suggestion => Some(self.fixup_spawn_height(suggestion)),
+            };
+            if let Some(feet) = feet {
+                return [feet.x, feet.y, feet.z];
+            }
+        }
+        spawn
+    }
     /// PlayerSpawnFinder.noCollisionNoLiquid: a player's box standing at the
     /// block's bottom centre touches no block or liquid.
     fn player_fits(&self, pos: [i32; 3]) -> bool {

crates/horizon-client/src/game/integrated.rs

@@ -52,6 +52,8 @@ struct Flags {
     /// server follows while it runs (IntegratedServer.tickServer).
     render_distance: AtomicI32,
     simulation_distance: AtomicI32,
+    /// `MinecraftServer.isCurrentlySaving`: the server is autosaving.
+    saving: AtomicBool,
 }
 
 /// Work the window hands its server thread (`MinecraftServer.execute`).
@@ -69,6 +71,10 @@ impl Integrated {
     pub fn smoothed_tick_ms(&self) -> f32 {
         f32::from_bits(self.flags.smoothed_tick_ms.load(Ordering::Relaxed))
     }
+    /// `MinecraftServer.isCurrentlySaving`.
+    pub fn is_saving(&self) -> bool {
+        self.flags.saving.load(Ordering::Relaxed)
+    }
     /// `IntegratedServer.tickServer` skips the world while the game is paused.
     pub fn set_paused(&self, paused: bool) {
         self.flags.paused.store(paused, Ordering::Relaxed);
@@ -148,6 +154,12 @@ pub(super) struct Serving {
     /// is out of its place: applied after the tick.
     pending: Option<Publish>,
 }
+impl Serving {
+    /// The window reads this as `MinecraftServer.isCurrentlySaving`.
+    pub(super) fn set_saving(&self, saving: bool) {
+        self.flags.saving.store(saving, Ordering::Relaxed);
+    }
+}
 enum Publish {
     Open(TcpListener, LanSettings),
     Close,

crates/horizon-client/src/game/jukebox.rs

@@ -79,6 +79,7 @@ impl Game<'_> {
         if !self.creative {
             self.consume_held();
         }
+        self.stats.custom("play_record", 1);
         self.world.block_entities.insert(
             (pos[0], pos[1], pos[2]),
             BlockEntity::Jukebox(Jukebox {

crates/horizon-client/src/game/lan.rs

@@ -11,7 +11,7 @@ use horizon_client::{
         chunks::ChunkEncoder,
         data::SyncData,
         entity::{EntityState, States},
-        hub::{HostEvent, HostState, Hub, HubConfig, TickCtx},
+        hub::{BodyFlags, HostEvent, HostState, Hub, HubConfig, TickCtx},
         playerdata,
     },
     mobs::{Mob, Who, leash::Holder},
@@ -21,14 +21,28 @@ use horizon_core::geometry::Vec3;
 use horizon_protocol::{
     crypto::offline_uuid,
     entity_data::{Value, serializer},
+    packets::play::{self, Clientbound as C},
 };
 use std::{
     collections::HashMap,
-    sync::{Arc, OnceLock},
+    sync::{Arc, Mutex},
 };
 
 /// The registries and tags are the same for every world: load them once.
-static SYNC: OnceLock<std::result::Result<Arc<SyncData>, String>> = OnceLock::new();
+static SYNC: Mutex<Option<std::result::Result<Arc<SyncData>, String>>> = Mutex::new(None);
+
+/// The registries and tags a server sends, loaded from `root` the first time.
+pub(super) fn sync_data(root: &std::path::Path) -> std::result::Result<Arc<SyncData>, String> {
+    let mut sync = SYNC.lock().unwrap_or_else(|e| e.into_inner());
+    sync.get_or_insert_with(|| SyncData::load(root).map(Arc::new))
+        .clone()
+}
+
+/// Let go of what `sync_data` loaded: for a preload no world used
+/// (game/world_loading.rs).
+pub(super) fn forget_sync_data() {
+    *SYNC.lock().unwrap_or_else(|e| e.into_inner()) = None;
+}
 
 /// The settings of the open world (WorldOptionsScreen's multiplayer section).
 #[derive(Clone, Copy, Debug)]
@@ -178,6 +192,17 @@ fn mob_meta(
         meta.push((9, serializer::FLOAT, Value::Float(health)));
     }
     defaults.push((9, serializer::FLOAT, Value::Float(1.0)));
+    // LivingEntity.DATA_EFFECT_PARTICLES and DATA_EFFECT_AMBIENCE_ID: the
+    // swirls of its effects (the ones a mob has are visible, not ambient).
+    meta.extend(
+        hub.effect_meta(
+            (m.extra.effects.iter())
+                .filter(|e| !m.extra.hidden_effects.contains(&e.0))
+                .map(|e| (e.0, false)),
+        ),
+    );
+    defaults.push((10, serializer::PARTICLES, Value::Particles(Vec::new())));
+    defaults.push((11, serializer::BOOLEAN, Value::Bool(false)));
     // Mob.DATA_MOB_FLAGS_ID: no AI 1, left-handed 2, aggressive 4 (what
     // draws a vindicator's axe, a skeleton's drawn bow, a piglin's raised
     // weapon).
@@ -223,6 +248,27 @@ fn mob_meta(
             }
             defaults.push((16, serializer::BYTE, Value::Byte(0)));
         }
+        // SnowGolem.DATA_PUMPKIN_ID: 16 while the pumpkin is on (the default).
+        "minecraft:snow_golem" => {
+            if e.sheared {
+                meta.push((16, serializer::BYTE, Value::Byte(0)));
+            }
+            defaults.push((16, serializer::BYTE, Value::Byte(16)));
+        }
+        // MushroomCow.DATA_TYPE: 0 red, 1 brown.
+        "minecraft:mooshroom" => {
+            if e.variant == 1 {
+                meta.push((17, serializer::INT, Value::Int(1)));
+            }
+            defaults.push((17, serializer::INT, Value::Int(0)));
+        }
+        // Piglin.DATA_IS_DANCING (after the baby flag and the crossbow charge).
+        "minecraft:piglin" => {
+            if e.scratch[0] > 0 {
+                meta.push((19, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            defaults.push((19, serializer::BOOLEAN, Value::Bool(false)));
+        }
         // Sheep.DATA_WOOL_ID: the colour in the low nibble, 16 when sheared.
         "minecraft:sheep" => {
             let value = (e.color & 15) | if e.sheared { 16 } else { 0 };
@@ -337,6 +383,14 @@ fn mob_meta(
             }
             defaults.push((17, serializer::BOOLEAN, Value::Bool(false)));
         }
+        // PolarBear.DATA_STANDING_ID (after AgeableMob's two): the bear
+        // rears up; the client animates it.
+        "minecraft:polar_bear" => {
+            if e.flag {
+                meta.push((18, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            defaults.push((18, serializer::BOOLEAN, Value::Bool(false)));
+        }
         // SpellcasterIllager.DATA_SPELL_CASTING_ID: the casting pose.
         "minecraft:evoker" | "minecraft:illusioner" => {
             if e.variant2 != 0 {
@@ -358,6 +412,26 @@ fn mob_meta(
     }
 }
 
+/// What a client shakes a mob by: Entity.DATA_TICKS_FROZEN (7), whose full
+/// count is `isFullyFrozen`, and Strider.DATA_SUFFOCATING (19, after
+/// AgeableMob's two and DATA_BOOST_TIME).
+fn mob_freeze_meta(
+    m: &Mob,
+    meta: &mut Vec<(u8, i32, Value)>,
+    defaults: &mut Vec<(u8, i32, Value)>,
+) {
+    if m.ticks_frozen > 0 {
+        meta.push((7, serializer::INT, Value::Int(m.ticks_frozen)));
+    }
+    defaults.push((7, serializer::INT, Value::Int(0)));
+    if m.kind.id == "minecraft:strider" {
+        if m.extra.flag {
+            meta.push((19, serializer::BOOLEAN, Value::Bool(true)));
+        }
+        defaults.push((19, serializer::BOOLEAN, Value::Bool(false)));
+    }
+}
+
 /// The equipment a mob shows (ClientboundSetEquipmentPacket slots: main hand,
 /// off hand, feet, legs, chest, head, body, saddle).
 fn mob_equipment(
@@ -366,13 +440,16 @@ fn mob_equipment(
     out: &mut Vec<(u8, Option<horizon_protocol::item::Stack>)>,
 ) {
     let e = &m.extra;
+    // A horse's armour, a llama's carpet, a harness: Horizon keeps the body
+    // slot's item (6) in `head`.
+    let body = horizon_client::mobs::drops::head_is_body(m.species());
     let slots = [
         (0u8, &e.main_hand),
         (1, &e.off_hand),
         (2, &e.feet),
         (3, &e.legs),
         (4, &e.chest),
-        (5, &e.head),
+        (if body { 6 } else { 5 }, &e.head),
     ];
     for (slot, item) in slots {
         if let Some(item) = item {
@@ -562,10 +639,7 @@ impl Game<'_> {
         config: HubConfig,
         host: Option<u128>,
     ) -> Result<()> {
-        let root = self.options.resources.clone();
-        let sync = SYNC
-            .get_or_init(|| SyncData::load(&root).map(Arc::new))
-            .clone()?;
+        let sync = sync_data(&self.options.resources)?;
         let biome_names: Vec<String> = self
             .res
             .biomes()
@@ -665,6 +739,7 @@ impl Game<'_> {
         self.audio.capture = None;
         self.lan_events.clear();
         self.lan_critical_hits.clear();
+        self.lan_cushion_breaks.clear();
         self.streaming.extra.clear();
         if announce {
             self.system_message(Text::translate(
@@ -835,6 +910,16 @@ impl Game<'_> {
             living_flags: living_flags(self.using)
                 | if p.auto_spin_attack_ticks > 0 { 4 } else { 0 },
             bed: self.sleeping,
+            body: BodyFlags {
+                gliding: p.fall_flying,
+                swimming: p.swimming,
+                crawling: p.pose == horizon_client::pose::Pose::Swimming && !p.swimming,
+                crouching: p.pose == horizon_client::pose::Pose::Crouching,
+                spin_attack: p.auto_spin_attack_ticks > 0,
+                on_fire: p.fire_ticks > 0,
+                invisible: self.potions.effects.get("invisibility").is_some(),
+                glowing: self.potions.effects.get("glowing").is_some(),
+            },
         })
     }
 
@@ -868,6 +953,7 @@ impl Game<'_> {
             e.velocity = [m.velocity.x, m.velocity.y, m.velocity.z];
             e.needs_sync = m.needs_sync;
             mob_meta(m, hub, player_entity, &mut e.meta, &mut e.defaults);
+            mob_freeze_meta(m, &mut e.meta, &mut e.defaults);
             mob_equipment(m, hub, &mut e.equipment);
             self.mob_attributes(m, &mut e.attributes);
             e.leash = leash;
@@ -944,6 +1030,9 @@ impl Game<'_> {
             for m in &mut self.mobs {
                 m.needs_sync = false;
             }
+            for p in &mut self.creatures.projectiles {
+                p.needs_sync = false;
+            }
             // `runBlockEvents`' broadcast precedes the tick's block changes
             // (`ChunkHolder.broadcastChanges` in `tick_level` below): the
             // guest re-runs a piston's `triggerEvent` while its level still
@@ -952,6 +1041,16 @@ impl Game<'_> {
                 host.hub.block_event(pos, b0, b1, state);
             }
             let entities = states.as_slice();
+            // An entity that left the level since the last tick (a snowball
+            // that hit) is dropped by the tracker below: its event goes out
+            // first, as `Level.broadcastEntityEvent` precedes the discard.
+            let (gone, later): (Vec<_>, Vec<_>) = std::mem::take(&mut self.lan_entity_events)
+                .into_iter()
+                .partition(|(id, ..)| !entities.iter().any(|e| e.id == *id));
+            self.lan_entity_events = later;
+            for (id, event, at) in gone {
+                host.hub.entity_event(id, event, at);
+            }
             let spawn = self.spawn.map_or([0.5, 80.0, 0.5], |s| [s.x, s.y, s.z]);
             let events = {
                 let clock_rate = self.network_clock_rate();
@@ -1094,8 +1193,11 @@ impl Game<'_> {
         drop(holding);
         lan::flush_all(host.hub.guests.iter().map(|g| &g.sender));
         self.lan = Some(host);
-        // A mace's wind burst from a guest's attack.
+        // A blast from a guest's attack, and a mace's wind burst.
+        self.flush_lan_explosions();
         let _ = self.flush_wind_bursts();
+        // Particles a guest's turn sent (sweep attack, damage indicator, a hook's splashes).
+        self.flush_lan_particles();
     }
 
     fn lan_guest_joined(
@@ -1128,8 +1230,17 @@ impl Game<'_> {
             g.game_mode = default_mode;
         }
         if !known {
-            g.position = spawn;
-            g.previous_position = spawn;
+            // ServerPlayer.adjustSpawnLocation: a player new to the world
+            // stands where PlayerSpawnFinder puts them, not all on one spot
+            // (it reads the loaded level, which holds the spawn when it is
+            // the overworld).
+            let feet = if self.dim == super::Dim::Overworld {
+                self.server_player_spawn(spawn)
+            } else {
+                spawn
+            };
+            g.position = feet;
+            g.previous_position = feet;
             g.health = 20.0;
             g.food = 20;
             g.dimension = super::Dim::Overworld.id().to_owned();
@@ -1188,8 +1299,9 @@ impl Game<'_> {
                 horizon_world::level::LevelEvent::LevelEvent { id, pos, data } => {
                     // The acting guest does not predict the egg's teleport
                     // particles, bone meal's growth, or anvil result sounds
-                    // (these levelEvent calls name no excluded player).
-                    let except = if matches!(*id, 2015 | 1505 | 1029 | 1030) {
+                    // (these levelEvent calls name no excluded player), nor
+                    // the digger's own crack and hit sound (2019, 2020).
+                    let except = if matches!(*id, 2015 | 1505 | 1029 | 1030 | 2019 | 2020) {
                         None
                     } else {
                         self.lan_acting
@@ -1224,8 +1336,9 @@ impl Game<'_> {
             self.lan_entity_events.push((id, event, at));
         }
     }
-    /// `ServerPlayer.crit`: this window's emitter, and an animation for the
-    /// attacker's client and observers once the hub is back in place.
+    /// `ServerPlayer.crit` (or `magicCrit` when `magic`): this window's
+    /// emitter, and an animation for the attacker's client and observers once
+    /// the hub is back in place.
     pub(super) fn critical_hit(
         &mut self,
         attacker: Option<u32>,
@@ -1233,21 +1346,50 @@ impl Game<'_> {
         feet: [f64; 3],
         width: f64,
         height: f64,
+        magic: bool,
     ) {
         use horizon_client::particles::{ParticleOptions, ParticleType};
-        self.particles.tracking_emitter(
-            ParticleOptions::simple(ParticleType::Crit),
-            feet,
-            width,
-            height,
-        );
+        let particle = if magic {
+            ParticleType::EnchantedHit
+        } else {
+            ParticleType::Crit
+        };
+        self.particles
+            .tracking_emitter(ParticleOptions::simple(particle), feet, width, height);
         if self.audio.capture.is_some() {
-            self.lan_critical_hits.push((attacker, id));
+            self.lan_critical_hits.push((attacker, id, magic));
         }
     }
     /// Send the tick's level events, sounds and mob animations.
     fn lan_flush_effects(&mut self, host: &mut LanHost) {
         let critical_hits = std::mem::take(&mut self.lan_critical_hits);
+        for (state, at) in std::mem::take(&mut self.lan_cushion_breaks) {
+            if let Some(id) = host
+                .hub
+                .registry_id("minecraft:particle_type", "minecraft:block")
+            {
+                host.hub.broadcast_near(
+                    at,
+                    32.0,
+                    &C::LevelParticles(play::LevelParticles {
+                        particle: horizon_protocol::entity_data::Particle {
+                            id,
+                            data: Some(horizon_protocol::entity_data::ParticleData::State(
+                                state.0 as i32,
+                            )),
+                        },
+                        override_limiter: false,
+                        always_show: false,
+                        pos: at,
+                        dist: [0.25, 0.0625, 0.25],
+                        max_speed: [0.05; 3],
+                        count: 10,
+                        randomization: 0,
+                    }),
+                    None,
+                );
+            }
+        }
         for (kind, pos, data, acting) in std::mem::take(&mut self.lan_events) {
             if kind == 2001 {
                 host.broken
@@ -1320,13 +1462,13 @@ impl Game<'_> {
             seen.insert(m.id, (m.hurt_time, dead, swing));
         }
         host.mob_state.insert(self.dim, seen);
-        for (attacker, target) in critical_hits {
+        for (attacker, target, magic) in critical_hits {
             let Some(attacker) = attacker.map_or(Some(host.host_entity), |conn| {
                 host.hub.guest(conn).map(|g| g.entity_id)
             }) else {
                 continue;
             };
-            host.hub.critical_hit(attacker, target);
+            host.hub.critical_hit(attacker, target, magic);
         }
     }
 
@@ -1409,6 +1551,14 @@ impl Game<'_> {
                 .each_ref()
                 .map(|s| s.as_ref().map(|s| s.item.clone()));
             m.extra.crouching = g.sneaking;
+            m.extra.avatar_pose = g.pose();
+            m.extra.sprinting = g.sprinting;
+            // LivingEntity.DATA_EFFECT_PARTICLES: the swirls of its visible effects.
+            let visible = || g.effects.list.iter().filter(|e| e.visible);
+            m.extra.effect_particles = visible()
+                .filter_map(|e| super::client_ambient::effect_particle(e.id, e.ambient))
+                .collect();
+            m.extra.effect_ambient = visible().all(|e| e.ambient);
             // Lying in its bed (LivingEntity.getBedOrientation).
             m.extra.ints[1] = g.bed.map_or(0, |b| self.bed_facing(b));
             // LivingEntity.updateSwingTime: the arm swing lan_swings started.