diff --git a/.bazelrc b/.bazelrc
new file mode 100644
index 0000000..b4af64a
--- /dev/null
+++ b/.bazelrc
@@ -0,0 +1,2 @@
+# ooz compression code has undefined behavior that manifests under -O2 with Clang.
+build --host_compilation_mode=dbg
diff --git a/.bazelversion b/.bazelversion
new file mode 100644
index 0000000..acd405b
--- /dev/null
+++ b/.bazelversion
@@ -0,0 +1 @@
+8.6.0
diff --git a/.dockerignore b/.dockerignore
index 6ba0470..334c93f 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,16 +1,19 @@
 *
+!.bazelrc
+!.bazelversion
+!BUILD.bazel
+!MODULE.bazel
+!MODULE.bazel.lock
+!third_party
+!patcher
 !web/main.py
 !web/pobgen.py
+!web/pobgen_en.py
 !web/nebuloch/*.py
 !web/nebuloch/data/*
 !web/templates/*
-!patcher
+patcher/Content.ggpk.d
+patcher/out
 patcher/bin
 patcher/scripts/__pycache__
-patcher/scripts/ninja_syntax.py
 patcher/schema.min.json
-patcher/build.ninja
-patcher/.ninja_log
-patcher/Content.ggpk.d
-patcher/venv
-patcher/out
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index c8174c2..8ad1c8a 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -4,40 +4,38 @@ on:
   pull_request:
 name: test
 
-defaults:
-  run:
-    working-directory: patcher
-
 jobs:
   patcher-test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-go@v2
+    - uses: actions/checkout@v4
+    - uses: bazel-contrib/setup-bazel@0.14.0
       with:
-        go-version: 1.x
-    - run: go test -v ./...
+        bazelisk-cache: true
+        disk-cache: ${{ github.workflow }}
+        repository-cache: true
+    - run: bazel test //patcher/...
 
   web-test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-      with:
-        submodules: recursive
-    - run: sudo apt-get install -y ninja-build cmake libsodium-dev libunistring-dev
-    - uses: actions/setup-go@v2
+    - uses: actions/checkout@v4
+    - uses: bazel-contrib/setup-bazel@0.14.0
       with:
-        go-version: 1.x
-    - uses: actions/setup-python@v2
-      with:
-        python-version: 3.x
+        bazelisk-cache: true
+        disk-cache: ${{ github.workflow }}
+        repository-cache: true
 
-    - run: python -m pip install virtualenv meson
-
-    - run: ./install.sh
-    - run: ./main.sh
-    - run: ./release.sh
+    - run: bash fetch.sh
+      working-directory: patcher
+    - run: bash main.sh
+      working-directory: patcher
+    - run: bash release.sh
+      working-directory: patcher
 
+    - uses: actions/setup-python@v5
+      with:
+        python-version: 3.x
     - run: python -m pip install -r requirements.txt -r test-requirements.txt
       working-directory: web
     - run: python -m pytest tests
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a6ef824
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/bazel-*
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index e3f94f8..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,9 +0,0 @@
-[submodule "patcher/extract/ooz"]
-	path = patcher/extract/ooz
-	url = https://github.com/zao/ooz.git
-[submodule "patcher/extract/subprojects/--recusrive"]
-	path = patcher/extract/subprojects/--recusrive
-	url = https://github.com/zao/ooz.git
-[submodule "patcher/extract/subprojects/ooz"]
-	path = patcher/extract/subprojects/ooz
-	url = https://github.com/zao/ooz.git
diff --git a/BUILD.bazel b/BUILD.bazel
new file mode 100644
index 0000000..514c078
--- /dev/null
+++ b/BUILD.bazel
@@ -0,0 +1 @@
+# Root BUILD file
diff --git a/Dockerfile b/Dockerfile
index 8582909..c7ab267 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,9 @@
-FROM docker.io/alpine:latest AS patcher
+FROM gcr.io/bazel-public/bazel:8.6.0 AS patcher
 
-WORKDIR /patcher
-COPY patcher /patcher
-RUN apk add --no-cache python3 py3-virtualenv go build-base git curl bash samurai \
-    meson cmake pkgconfig libsodium-dev libunistring-dev
-RUN ./install.sh
-RUN ./main.sh
+WORKDIR /build
+COPY --chown=ubuntu . /build
+RUN cd patcher && bash fetch.sh
+RUN cd patcher && bash main.sh
 
 
 FROM docker.io/alpine:latest as web
@@ -16,6 +14,6 @@ ENV PYTHONUNBUFFERED True
 
 WORKDIR /web
 COPY web /web
-COPY --from=patcher /patcher/out/release /web/nebuloch/data
+COPY --from=patcher /build/patcher/out/release /web/nebuloch/data
 
 CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 main:app
diff --git a/MODULE.bazel b/MODULE.bazel
new file mode 100644
index 0000000..f3eab0e
--- /dev/null
+++ b/MODULE.bazel
@@ -0,0 +1,76 @@
+module(
+    name = "void-battery",
+    version = "0.0.0",
+)
+
+bazel_dep(name = "toolchains_chromium", version = "0.0.1")
+bazel_dep(name = "rules_cc", version = "0.2.14")
+bazel_dep(name = "libsodium", version = "1.0.19")
+bazel_dep(name = "simde", version = "0.8.2")
+bazel_dep(name = "rules_go", version = "0.60.0")
+bazel_dep(name = "gazelle", version = "0.47.0")
+bazel_dep(name = "ooz", version = "0")
+bazel_dep(name = "libunistring", version = "1.3")
+bazel_dep(name = "rules_python", version = "1.9.0")
+bazel_dep(name = "rules_pkg", version = "1.2.0")
+bazel_dep(name = "platforms", version = "1.0.0")
+bazel_dep(name = "gamedata", version = "0")
+
+git_override(
+    module_name = "toolchains_chromium",
+    remote = "https://github.com/afq984/toolchains_chromium.git",
+    commit = "1a93deae0f654933afe585749d35b7ef82d89bd8",
+)
+
+git_override(
+    module_name = "ooz",
+    remote = "https://github.com/zao/ooz.git",
+    commit = "6307b387e45c6b2283d622d82d2713a38e25e503",
+    build_file = "//third_party:ooz.BUILD",
+    init_submodules = False,
+    patches = ["//third_party/patches:ooz_add_module.patch"],
+    patch_strip = 0,
+)
+
+archive_override(
+    module_name = "libunistring",
+    urls = ["https://mirrors.kernel.org/gnu/libunistring/libunistring-1.3.tar.gz"],
+    sha256 = "8ea8ccf86c09dd801c8cac19878e804e54f707cf69884371130d20bde68386b7",
+    strip_prefix = "libunistring-1.3",
+    build_file = "//third_party:libunistring.BUILD",
+    patches = ["//third_party/patches:libunistring_bazel.patch"],
+    patch_strip = 1,
+    patch_cmds = [
+        # Generate public headers from .in.h templates.
+        # All @...@ substitutions are DLL_VARIABLE markers, empty on Linux.
+        "for f in lib/unistr.in.h lib/unicase.in.h lib/unitypes.in.h lib/uninorm.in.h lib/unictype.in.h lib/unistring/woe32dll.in.h; do sed -e 's/@HAVE_UNISTRING_WOE32DLL_H@/0/g' -e 's/@[A-Za-z0-9_]*@//g' \"$f\" > \"${f%.in.h}.h\"; done",
+        # Generate unistring/stdint.h (just wraps system <stdint.h>).
+        "echo '#include <stdint.h>' > lib/unistring/stdint.h",
+        # special-casing.in.h is identical to special-casing.h for our purposes.
+        "cp lib/unicase/special-casing.in.h lib/unicase/special-casing.h",
+    ],
+)
+
+go_deps = use_extension("@gazelle//:extensions.bzl", "go_deps")
+go_deps.from_file(go_mod = "//patcher:go.mod")
+use_repo(
+    go_deps,
+    "com_github_google_go_cmp",
+    "com_github_pierrec_lz4_v4",
+    "com_github_spf13_pflag",
+    "org_golang_x_text",
+)
+
+local_path_override(
+    module_name = "gamedata",
+    path = "third_party/empty_gamedata",
+)
+
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(python_version = "3.12")
+
+chromium = use_extension("@toolchains_chromium//:extensions.bzl", "chromium")
+chromium.toolchain()
+use_repo(chromium, "chromium_toolchain")
+
+register_toolchains("@chromium_toolchain//:all")
diff --git a/MODULE.bazel.lock b/MODULE.bazel.lock
new file mode 100644
index 0000000..0c2c3f4
--- /dev/null
+++ b/MODULE.bazel.lock
@@ -0,0 +1,567 @@
+{
+  "lockFileVersion": 24,
+  "registryFileHashes": {
+    "https://bcr.bazel.build/bazel_registry.json": "8a28e4aff06ee60aed2a8c281907fb8bcbf3b753c91fb5a5c57da3215d5b3497",
+    "https://bcr.bazel.build/modules/abseil-cpp/20210324.2/MODULE.bazel": "7cd0312e064fde87c8d1cd79ba06c876bd23630c83466e9500321be55c96ace2",
+    "https://bcr.bazel.build/modules/abseil-cpp/20211102.0/MODULE.bazel": "70390338f7a5106231d20620712f7cccb659cd0e9d073d1991c038eb9fc57589",
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+    "https://bcr.bazel.build/modules/bazel_features/1.19.0/MODULE.bazel": "59adcdf28230d220f0067b1f435b8537dd033bfff8db21335ef9217919c7fb58",
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+    "https://bcr.bazel.build/modules/bazel_features/1.9.1/MODULE.bazel": "8f679097876a9b609ad1f60249c49d68bfab783dd9be012faf9d82547b14815a",
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+    "https://bcr.bazel.build/modules/jq.bzl/0.1.0/source.json": "746bf13cac0860f091df5e4911d0c593971cd8796b5ad4e809b2f8e133eee3d5",
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+                "": "23.0.0"
+              },
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+                "": "'@@toolchains_chromium++chromium+chromium_toolchain_clang//'"
+              },
+              "sysroot": {
+                "linux-x86_64": "'@@toolchains_chromium++chromium+chromium_toolchain_sysroot_linux_x86_64//sysroot'"
+              },
+              "stdlib": {
+                "": "dynamic-stdc++"
+              },
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+            "bazel_features",
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+            "helly25_bzl",
+            "helly25_bzl+"
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+}
diff --git a/patcher/.gitignore b/patcher/.gitignore
index 8055e88..617f46d 100644
--- a/patcher/.gitignore
+++ b/patcher/.gitignore
@@ -1,10 +1,5 @@
 __pycache__/
 /bin/
 schema.min.json
-build.ninja
-.ninja_log
-/scripts/ninja_syntax.py
 /Content.ggpk.d
-/venv/
 /out/
-.wraplock
diff --git a/patcher/BUILD.bazel b/patcher/BUILD.bazel
new file mode 100644
index 0000000..23f5d84
--- /dev/null
+++ b/patcher/BUILD.bazel
@@ -0,0 +1,23 @@
+load("@gazelle//:def.bzl", "gazelle")
+
+# gazelle:prefix github.com/afq984/void-battery/patcher
+
+gazelle(name = "gazelle")
+
+py_binary(
+    name = "fetch",
+    srcs = ["fetch.py"],
+    args = [
+        "$(location //patcher/extract)",
+        "$(location //patcher/cmd/poepatcher)",
+    ],
+    data = [
+        "//patcher/cmd/poepatcher",
+        "//patcher/extract",
+    ],
+)
+
+exports_files([
+    "go.mod",
+    "schema.min.json",
+])
diff --git a/patcher/README.md b/patcher/README.md
index 786302a..c7ef2e8 100644
--- a/patcher/README.md
+++ b/patcher/README.md
@@ -1,38 +1,44 @@
 # Patcher
 
-This directory contains tools to update the game data.
+Tools for downloading and extracting game data from the PoE TW patch server.
 
-### Build tools
+## Prerequisites
 
-First have these dependencies installed:
+* [Bazelisk](https://github.com/bazelbuild/bazelisk) installed as `bazel`
+* `curl`
 
-* bash
-* python3
-* go
-* curl
-* gcc
-* ninja
+## Usage
 
-Then run:
+### Fetch game data
+
+Downloads the schema and game files from the patch server:
+
+```
+bash fetch.sh
+```
+
+### Build release files
+
+Runs the Bazel pipeline (extract → dat2jsonl → release JSON):
 
 ```
-./install.sh
+bash main.sh
 ```
 
-### Download the game files and extract them
+### Compare with current web data
 
 ```
-./main.sh
+bash diff.sh
 ```
 
-### Compare the current extracted data with the ones in `../web`:
+### Copy release files to the web app
 
 ```
-./diff.sh
+bash release.sh
 ```
 
-### Copy the extracted data to `../web`:
+## Running tests
 
 ```
-./release.sh
+bazel test //patcher/...
 ```
diff --git a/patcher/cmd/BUILD.bazel b/patcher/cmd/BUILD.bazel
new file mode 100644
index 0000000..a8ca58e
--- /dev/null
+++ b/patcher/cmd/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "cmd",
+    srcs = ["init.go"],
+    importpath = "github.com/afq984/void-battery/patcher/cmd",
+    visibility = ["//visibility:public"],
+)
diff --git a/patcher/cmd/dat2jsonl/BUILD.bazel b/patcher/cmd/dat2jsonl/BUILD.bazel
new file mode 100644
index 0000000..68fea1e
--- /dev/null
+++ b/patcher/cmd/dat2jsonl/BUILD.bazel
@@ -0,0 +1,21 @@
+load("@rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "dat2jsonl_lib",
+    srcs = ["main.go"],
+    importpath = "github.com/afq984/void-battery/patcher/cmd/dat2jsonl",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//patcher/cmd",
+        "//patcher/dat",
+        "//patcher/dat/schema",
+        "//patcher/dat/types",
+        "@com_github_spf13_pflag//:pflag",
+    ],
+)
+
+go_binary(
+    name = "dat2jsonl",
+    embed = [":dat2jsonl_lib"],
+    visibility = ["//visibility:public"],
+)
diff --git a/patcher/cmd/poepatcher/BUILD.bazel b/patcher/cmd/poepatcher/BUILD.bazel
new file mode 100644
index 0000000..4066c62
--- /dev/null
+++ b/patcher/cmd/poepatcher/BUILD.bazel
@@ -0,0 +1,18 @@
+load("@rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "poepatcher_lib",
+    srcs = ["main.go"],
+    importpath = "github.com/afq984/void-battery/patcher/cmd/poepatcher",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//patcher/cmd",
+        "//patcher/poepatcher",
+    ],
+)
+
+go_binary(
+    name = "poepatcher",
+    embed = [":poepatcher_lib"],
+    visibility = ["//visibility:public"],
+)
diff --git a/patcher/dat/BUILD.bazel b/patcher/dat/BUILD.bazel
new file mode 100644
index 0000000..0b141c7
--- /dev/null
+++ b/patcher/dat/BUILD.bazel
@@ -0,0 +1,9 @@
+load("@rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "dat",
+    srcs = ["dat.go"],
+    importpath = "github.com/afq984/void-battery/patcher/dat",
+    visibility = ["//visibility:public"],
+    deps = ["//patcher/dat/types"],
+)
diff --git a/patcher/dat/schema/BUILD.bazel b/patcher/dat/schema/BUILD.bazel
new file mode 100644
index 0000000..91136fa
--- /dev/null
+++ b/patcher/dat/schema/BUILD.bazel
@@ -0,0 +1,9 @@
+load("@rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "schema",
+    srcs = ["schema.go"],
+    importpath = "github.com/afq984/void-battery/patcher/dat/schema",
+    visibility = ["//visibility:public"],
+    deps = ["//patcher/dat/types"],
+)
diff --git a/patcher/dat/types/BUILD.bazel b/patcher/dat/types/BUILD.bazel
new file mode 100644
index 0000000..aed8718
--- /dev/null
+++ b/patcher/dat/types/BUILD.bazel
@@ -0,0 +1,27 @@
+load("@rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "types",
+    srcs = [
+        "array.go",
+        "bool.go",
+        "int.go",
+        "layout.go",
+        "null.go",
+        "pointer.go",
+        "string.go",
+        "struct.go",
+        "type.go",
+        "value.go",
+    ],
+    importpath = "github.com/afq984/void-battery/patcher/dat/types",
+    visibility = ["//visibility:public"],
+    deps = ["@org_golang_x_text//encoding/unicode"],
+)
+
+go_test(
+    name = "types_test",
+    srcs = ["types_test.go"],
+    embed = [":types"],
+    deps = ["@com_github_google_go_cmp//cmp"],
+)
diff --git a/patcher/extract/BUILD.bazel b/patcher/extract/BUILD.bazel
new file mode 100644
index 0000000..8c9679b
--- /dev/null
+++ b/patcher/extract/BUILD.bazel
@@ -0,0 +1,13 @@
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "extract",
+    srcs = ["extract.cpp"],
+    copts = ["-std=c++17"],
+    data = ["@ooz//:libooz_so"],
+    visibility = ["//patcher:__subpackages__"],
+    deps = [
+        "@ooz//:libbun",
+        "@rules_cc//cc/runfiles",
+    ],
+)
diff --git a/patcher/extract/extract.cpp b/patcher/extract/extract.cpp
index 92b2562..2c87e1a 100644
--- a/patcher/extract/extract.cpp
+++ b/patcher/extract/extract.cpp
@@ -1,17 +1,20 @@
-#ifdef NDEBUG
-#error broken config
-#endif
-
-#include <cassert>
+#include <cstdio>
 #include <filesystem>
 #include <fstream>
+#include <memory>
 #include <optional>
 #include <string>
 
 #include <bun.h>
+#include "rules_cc/cc/runfiles/runfiles.h"
+
+using rules_cc::cc::runfiles::Runfiles;
 
 int main(int argc, char **argv) {
-    assert(argc == 3 || argc == 4);
+    if (argc != 3 && argc != 4) {
+        fprintf(stderr, "usage: %s <ggpkd> <path> [output]\n", argv[0]);
+        return 1;
+    }
     std::string ggpkd(argv[1]);
     std::string path(argv[2]);
     std::optional<std::filesystem::path> out;
@@ -19,31 +22,49 @@ int main(int argc, char **argv) {
         out = argv[3];
     }
 
-    Bun *bun =
-        BunNew("extract/build/subprojects/ooz/liblibooz.so", "Ooz_Decompress");
-    assert(bun);
+    std::string error;
+    auto runfiles = std::unique_ptr<Runfiles>(
+        Runfiles::Create(argv[0], BAZEL_CURRENT_REPOSITORY, &error));
+    if (!runfiles) {
+        fprintf(stderr, "Failed to create runfiles: %s\n", error.c_str());
+        return 1;
+    }
+    auto ooz_path = runfiles->Rlocation("ooz/liblibooz.so");
+    Bun *bun = BunNew(ooz_path.c_str(), "Ooz_Decompress");
+    if (!bun) {
+        fprintf(stderr, "Failed to load liblibooz.so\n");
+        return 1;
+    }
 
     BunIndex *idx = BunIndexOpen(bun, nullptr, ggpkd.c_str());
-    assert(idx);
+    if (!idx) {
+        fprintf(stderr, "Failed to open bundle index at %s\n", ggpkd.c_str());
+        return 1;
+    }
 
     int32_t file_id = BunIndexLookupFileByPath(idx, path.c_str());
-    assert(file_id >= 0);
+    if (file_id < 0) {
+        fprintf(stderr, "File not found: %s\n", path.c_str());
+        return 1;
+    }
 
     uint64_t path_hash;
     uint32_t bundle_id;
     uint32_t offset;
     uint32_t size;
-    assert(BunIndexFileInfo(idx, file_id, &path_hash, &bundle_id, &offset,
-                            &size) == 0);
+    BunIndexFileInfo(idx, file_id, &path_hash, &bundle_id, &offset, &size);
 
     if (!out) {
         const char* name;
         uint32_t uncompressed_size;
-        assert(BunIndexBundleInfo(idx, bundle_id, &name, &uncompressed_size) == 0);
+        BunIndexBundleInfo(idx, bundle_id, &name, &uncompressed_size);
         printf("%s\n", name);
     } else {
         BunMem p = BunIndexExtractBundle(idx, bundle_id);
-        assert(p);
+        if (!p) {
+            fprintf(stderr, "Failed to extract bundle %u\n", bundle_id);
+            return 1;
+        }
 
         std::filesystem::create_directories(out->parent_path());
 
diff --git a/patcher/extract/meson.build b/patcher/extract/meson.build
deleted file mode 100644
index 380ecf3..0000000
--- a/patcher/extract/meson.build
+++ /dev/null
@@ -1,19 +0,0 @@
-project(
-    'extract',
-    'cpp',
-    default_options: ['warning_level=0', 'cpp_std=c++17'],
-)
-
-cmake = import('cmake')
-
-ooz = cmake.subproject('ooz')
-
-exe = executable(
-    'extract',
-    'extract.cpp',
-    install: true,
-    dependencies: [
-        ooz.dependency('libbun'),
-        ooz.dependency('libooz'),
-    ],
-)
diff --git a/patcher/extract/subprojects/ooz b/patcher/extract/subprojects/ooz
deleted file mode 160000
index 6307b38..0000000
--- a/patcher/extract/subprojects/ooz
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 6307b387e45c6b2283d622d82d2713a38e25e503
diff --git a/patcher/fetch.py b/patcher/fetch.py
new file mode 100644
index 0000000..c688fd9
--- /dev/null
+++ b/patcher/fetch.py
@@ -0,0 +1,74 @@
+"""Populate Content.ggpk.d/ with game data needed by the patcher pipeline.
+
+This is the non-hermetic fetch step: it downloads game files from the
+patch server and resolves bundle paths via the extract binary.
+
+Intended to be run via: bazel run //patcher:fetch
+"""
+
+import os
+import subprocess
+import sys
+
+# Files to extract (must match genbuild.py)
+EXTRACT_DEPS = [
+    "data/activeskills.datc64",
+    "data/baseitemtypes.datc64",
+    "data/passiveskills.datc64",
+    "data/skillgems.datc64",
+    "data/words.datc64",
+    "data/traditional chinese/activeskills.datc64",
+    "data/traditional chinese/baseitemtypes.datc64",
+    "data/traditional chinese/passiveskills.datc64",
+    "data/traditional chinese/skillgems.datc64",
+    "data/traditional chinese/words.datc64",
+    "metadata/statdescriptions/stat_descriptions.txt",
+    "metadata/statdescriptions/tincture_stat_descriptions.txt",
+]
+
+
+def main():
+    extract = os.path.abspath(sys.argv[1])
+    poepatcher = os.path.abspath(sys.argv[2])
+
+    patcher_dir = os.path.join(os.environ["BUILD_WORKSPACE_DIRECTORY"], "patcher")
+    os.chdir(patcher_dir)
+
+    # Seed targets: game binary + bundle index
+    targets = {
+        "PathOfExile.exe",
+        "Bundles2/_.index.bin",
+    }
+    subprocess.check_call([poepatcher, *targets])
+
+    # Discover which bundles contain the files we need
+    for dep in EXTRACT_DEPS:
+        result = subprocess.run(
+            [extract, "Content.ggpk.d/latest", dep],
+            text=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+        )
+        if result.returncode:
+            print(result.stderr, file=sys.stderr)
+            result.check_returncode()
+        bundle_path = f"Bundles2/{result.stdout.strip()}.bundle.bin"
+        print(f"{dep} => {bundle_path}", file=sys.stderr)
+        targets.add(bundle_path)
+
+    # Fetch all discovered bundles
+    subprocess.check_call([poepatcher, *targets])
+
+    # Write Bazel files so --override_repository can point here
+    latest = os.path.join(patcher_dir, "Content.ggpk.d", "latest")
+    with open(os.path.join(latest, "MODULE.bazel"), "w") as f:
+        f.write('module(name = "gamedata", version = "0")\n')
+    with open(os.path.join(latest, "BUILD.bazel"), "w") as f:
+        f.write(
+            'filegroup(name = "all", srcs = glob(["**"], exclude = ["BUILD.bazel", "MODULE.bazel"]), visibility = ["//visibility:public"])\n'
+            'exports_files(glob(["**"], exclude = ["BUILD.bazel", "MODULE.bazel"]), visibility = ["//visibility:public"])\n'
+        )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/patcher/fetch.sh b/patcher/fetch.sh
new file mode 100755
index 0000000..9c04c6a
--- /dev/null
+++ b/patcher/fetch.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+# Download schema and fetch game data. Run main.sh afterwards to process.
+
+set -eux
+
+cd "$(dirname "$0")"
+
+curl -o schema.min.json -fL https://github.com/poe-tool-dev/dat-schema/releases/download/latest/schema.min.json
+
+bazel run //patcher:fetch
diff --git a/patcher/install.sh b/patcher/install.sh
deleted file mode 100755
index 40e5fb2..0000000
--- a/patcher/install.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/bin/bash
-set -ex
-
-curl -o schema.min.json -fL https://github.com/poe-tool-dev/dat-schema/releases/download/latest/schema.min.json
-curl -o scripts/ninja_syntax.py -fL https://github.com/ninja-build/ninja/raw/master/misc/ninja_syntax.py
-
-virtualenv venv
-venv/bin/python -m pip install tqdm
-
-go build -o bin/ ./cmd/...
-
-meson setup --wipe --optimization=2 extract/build extract
-ninja -C extract/build
diff --git a/patcher/main.sh b/patcher/main.sh
index 81499e1..1af7efe 100755
--- a/patcher/main.sh
+++ b/patcher/main.sh
@@ -2,8 +2,10 @@
 
 set -eux
 
-mkdir -p out/release
-mkdir -p out/extracted
+REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+
+bazel build //patcher/pipeline:release \
+  --override_repository=gamedata+="$REPO_ROOT/patcher/Content.ggpk.d/latest"
 
-venv/bin/python scripts/genbuild.py
-ninja
+mkdir -p out/release
+tar xf "$REPO_ROOT/bazel-bin/patcher/pipeline/release.tar" -C out/release/
diff --git a/patcher/pipeline/BUILD.bazel b/patcher/pipeline/BUILD.bazel
new file mode 100644
index 0000000..b7b02ba
--- /dev/null
+++ b/patcher/pipeline/BUILD.bazel
@@ -0,0 +1,104 @@
+load("@rules_pkg//pkg:tar.bzl", "pkg_tar")
+load(":defs.bzl", "patcher_dat2jsonl", "patcher_extract")
+
+# Data processing pipeline: extract game data → JSON release files.
+#
+# Requires game data to be fetched first via: bazel run //patcher:fetch
+#
+# Build with:
+#   bazel build //patcher/pipeline:release \
+#     --override_repository=gamedata+=$PWD/patcher/Content.ggpk.d/latest
+
+# --- Extract + dat2jsonl for each table × language ---
+
+_TABLES = ["BaseItemTypes", "ActiveSkills", "PassiveSkills", "SkillGems", "Words"]
+
+[
+    patcher_dat2jsonl(
+        name = "%s_%s" % (table, lang),
+        table_name = table,
+        lang = lang,
+    )
+    for table in _TABLES
+    for lang in ["en", "tc"]
+]
+
+# --- Extract stat description files ---
+
+patcher_extract(
+    name = "extract_stat_descriptions",
+    path = "metadata/statdescriptions/stat_descriptions.txt",
+    out = "extracted/stat_descriptions.txt",
+)
+
+patcher_extract(
+    name = "extract_tincture_stat_descriptions",
+    path = "metadata/statdescriptions/tincture_stat_descriptions.txt",
+    out = "extracted/tincture_stat_descriptions.txt",
+)
+
+# --- Python processing: .jsonl/.txt → release JSON ---
+
+_JSONL_SRCS = [":dat2jsonl_%s_%s" % (table, lang) for table in _TABLES for lang in ["en", "tc"]]
+
+genrule(
+    name = "datrelease",
+    srcs = _JSONL_SRCS,
+    outs = [
+        "release/bases.json",
+        "release/passives.json",
+        "release/words.json",
+    ],
+    cmd = "$(location //patcher/scripts:datrelease) --input-dir=$$(dirname $(location :dat2jsonl_BaseItemTypes_en)) --output-dir=$$(dirname $(location release/bases.json))",
+    tools = ["//patcher/scripts:datrelease"],
+)
+
+genrule(
+    name = "statparse",
+    srcs = [
+        ":extract_stat_descriptions",
+        ":extract_tincture_stat_descriptions",
+    ],
+    outs = ["release/stat_descriptions.json"],
+    cmd = "$(location //patcher/scripts:statparse) $(location :extract_stat_descriptions) $(location :extract_tincture_stat_descriptions) > $@",
+    tools = ["//patcher/scripts:statparse"],
+)
+
+genrule(
+    name = "charversion",
+    srcs = ["@gamedata//:PathOfExile.exe"],
+    outs = ["release/version.txt"],
+    cmd = "$(location //patcher/scripts:charversion) $(location @gamedata//:PathOfExile.exe) > $@",
+    tools = ["//patcher/scripts:charversion"],
+)
+
+genrule(
+    name = "fingerprint",
+    srcs = [
+        "release/bases.json",
+        "release/stat_descriptions.json",
+        "release/words.json",
+        "release/passives.json",
+        "release/version.txt",
+    ],
+    outs = ["release/fingerprint.txt"],
+    cmd = "$(location //patcher/scripts:fingerprint) $(location release/bases.json) $(location release/stat_descriptions.json) $(location release/words.json) $(location release/passives.json) $(location release/version.txt) > $@",
+    tools = ["//patcher/scripts:fingerprint"],
+)
+
+# --- Release tarball ---
+
+pkg_tar(
+    name = "release",
+    srcs = [
+        "release/bases.json",
+        "release/fingerprint.txt",
+        "release/passives.json",
+        "release/stat_descriptions.json",
+        "release/version.txt",
+        "release/words.json",
+    ],
+    mode = "0644",
+    strip_prefix = "release",
+    visibility = ["//visibility:public"],
+)
diff --git a/patcher/pipeline/defs.bzl b/patcher/pipeline/defs.bzl
new file mode 100644
index 0000000..9618e59
--- /dev/null
+++ b/patcher/pipeline/defs.bzl
@@ -0,0 +1,50 @@
+"""Macros for the patcher data processing pipeline."""
+
+_GAMEDATA = "@gamedata//:all"
+_INDEX_BIN = "@gamedata//:Bundles2/_.index.bin"
+_EXTRACT = "//patcher/extract"
+_DAT2JSONL = "//patcher/cmd/dat2jsonl"
+_SCHEMA = "//patcher:schema.min.json"
+_GGPKD = "$$(dirname $$(dirname $(location @gamedata//:Bundles2/_.index.bin)))"
+
+def patcher_extract(name, path, out):
+    """Extract a file from game bundles."""
+    native.genrule(
+        name = name,
+        srcs = [_GAMEDATA, _INDEX_BIN],
+        outs = [out],
+        cmd = "$(location {extract}) {ggpkd} '{path}' $@".format(
+            extract = _EXTRACT,
+            ggpkd = _GGPKD,
+            path = path,
+        ),
+        tools = [_EXTRACT],
+    )
+
+def patcher_dat2jsonl(name, table_name, lang):
+    """Extract a .datc64 file and convert it to .jsonl.
+
+    Creates two targets: extract_{name} and dat2jsonl_{name}.
+    """
+    datfiles = {"en": "", "tc": "traditional chinese/"}
+    extract_name = "extract_%s" % name
+    datfile = "%sdata/%s%s.datc64" % ("", datfiles[lang], table_name.lower())
+
+    patcher_extract(
+        name = extract_name,
+        path = datfile,
+        out = "extracted/%s.%s.datc64" % (table_name, lang),
+    )
+
+    native.genrule(
+        name = "dat2jsonl_%s" % name,
+        srcs = [":%s" % extract_name, _SCHEMA],
+        outs = ["extracted/%s.%s.jsonl" % (table_name, lang)],
+        cmd = "$(location {dat2jsonl}) --dat=$(location :{extract}) --table-name={table} --schema=$(location {schema}) > $@".format(
+            dat2jsonl = _DAT2JSONL,
+            extract = extract_name,
+            table = table_name,
+            schema = _SCHEMA,
+        ),
+        tools = [_DAT2JSONL],
+    )
diff --git a/patcher/poepatcher/BUILD.bazel b/patcher/poepatcher/BUILD.bazel
new file mode 100644
index 0000000..af86dbc
--- /dev/null
+++ b/patcher/poepatcher/BUILD.bazel
@@ -0,0 +1,12 @@
+load("@rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "poepatcher",
+    srcs = ["patcher.go"],
+    importpath = "github.com/afq984/void-battery/patcher/poepatcher",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_github_pierrec_lz4_v4//:lz4",
+        "@org_golang_x_text//encoding/unicode",
+    ],
+)
diff --git a/patcher/scripts/BUILD.bazel b/patcher/scripts/BUILD.bazel
new file mode 100644
index 0000000..d8fd2d0
--- /dev/null
+++ b/patcher/scripts/BUILD.bazel
@@ -0,0 +1,35 @@
+py_binary(
+    name = "datrelease",
+    srcs = ["datrelease.py"],
+    visibility = ["//patcher:__subpackages__"],
+)
+
+py_binary(
+    name = "statparse",
+    srcs = ["statparse.py"],
+    visibility = ["//patcher:__subpackages__"],
+    deps = [":pjson", ":tqdm_stub"],
+)
+
+py_binary(
+    name = "charversion",
+    srcs = ["charversion.py"],
+    visibility = ["//patcher:__subpackages__"],
+)
+
+py_binary(
+    name = "fingerprint",
+    srcs = ["fingerprint.py"],
+    visibility = ["//patcher:__subpackages__"],
+)
+
+py_library(
+    name = "pjson",
+    srcs = ["pjson.py"],
+)
+
+py_library(
+    name = "tqdm_stub",
+    srcs = ["tqdm/__init__.py"],
+    imports = ["."],
+)
diff --git a/patcher/scripts/datrelease.py b/patcher/scripts/datrelease.py
index 26a3d05..cf2e3c7 100644
--- a/patcher/scripts/datrelease.py
+++ b/patcher/scripts/datrelease.py
@@ -1,37 +1,39 @@
 import json
 import collections
 import sys
+import argparse
+import os
 
 
-def getjson(name, lang):
+def getjson(input_dir, name, lang):
     out = []
-    with open(f'out/extracted/{name}.{lang}.jsonl', encoding='utf8') as file:
+    with open(os.path.join(input_dir, f'{name}.{lang}.jsonl'), encoding='utf8') as file:
         for line in file:
             out.append(json.loads(line))
     return out
 
 
-def generate_words():
-    data = getjson('Words', 'tc')
+def generate_words(input_dir, output_dir):
+    data = getjson(input_dir, 'Words', 'tc')
 
     words = {}
 
     for m in data:
         words[m['Text2'].strip()] = m['Text'].strip()
 
-    write_to_file(words, 'out/release/words.json')
+    write_to_file(words, os.path.join(output_dir, 'words.json'))
 
 
-def getnames(fn, lang, fieldname):
-    data = getjson(fn, lang)
+def getnames(input_dir, fn, lang, fieldname):
+    data = getjson(input_dir, fn, lang)
     return [m[fieldname].strip() for m in data]
 
 
-def generate_bases():
-    z = getnames('BaseItemTypes', 'tc', 'Name')
-    e = getnames('BaseItemTypes', 'en', 'Name')
-    z.extend(getnames('ActiveSkills', 'tc', 'DisplayedName'))
-    e.extend(getnames('ActiveSkills', 'en', 'DisplayedName'))
+def generate_bases(input_dir, output_dir):
+    z = getnames(input_dir, 'BaseItemTypes', 'tc', 'Name')
+    e = getnames(input_dir, 'BaseItemTypes', 'en', 'Name')
+    z.extend(getnames(input_dir, 'ActiveSkills', 'tc', 'DisplayedName'))
+    e.extend(getnames(input_dir, 'ActiveSkills', 'en', 'DisplayedName'))
 
     ze = build_mapping(z, e)
 
@@ -40,7 +42,7 @@ def generate_bases():
     ze['鏽劍'] = 'Rusted Sword'
     ze['奉獻'] = 'The Offering'
 
-    write_to_file(ze, 'out/release/bases.json')
+    write_to_file(ze, os.path.join(output_dir, 'bases.json'))
 
 
 def build_mapping(z, e):
@@ -61,13 +63,25 @@ def write_to_file(ze, filename):
         json.dump(ze, file, ensure_ascii=False, indent=0, sort_keys=True)
 
 
-def generate_passives():
-    z = getnames('PassiveSkills', 'tc', 'Name')
-    e = getnames('PassiveSkills', 'en', 'Name')
+def generate_passives(input_dir, output_dir):
+    z = getnames(input_dir, 'PassiveSkills', 'tc', 'Name')
+    e = getnames(input_dir, 'PassiveSkills', 'en', 'Name')
     ze = build_mapping(z, e)
-    write_to_file(ze, 'out/release/passives.json')
+    write_to_file(ze, os.path.join(output_dir, 'passives.json'))
 
 
-generate_words()
-generate_bases()
-generate_passives()
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--input-dir', default='out/extracted')
+    parser.add_argument('--output-dir', default='out/release')
+    args = parser.parse_args()
+
+    os.makedirs(args.output_dir, exist_ok=True)
+
+    generate_words(args.input_dir, args.output_dir)
+    generate_bases(args.input_dir, args.output_dir)
+    generate_passives(args.input_dir, args.output_dir)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/patcher/scripts/genbuild.py b/patcher/scripts/genbuild.py
deleted file mode 100644
index db871bb..0000000
--- a/patcher/scripts/genbuild.py
+++ /dev/null
@@ -1,168 +0,0 @@
-import os
-import shlex
-import subprocess
-import sys
-
-import ninja_syntax
-
-
-stampfile = "out/extracted/ggpk.stamp"
-
-
-def write_build(writer):
-    write_download(writer)
-
-
-def write_dat2json(writer, table_name, path, out):
-    write_extract(
-        writer,
-        f"{out}.datc64",
-        path,
-    )
-    writer.build(
-        f"{out}.jsonl",
-        "dat2jsonl",
-        inputs=f"{out}.datc64",
-        implicit=["bin/dat2jsonl", "schema.min.json"],
-        variables={"table_name": table_name},
-    )
-
-
-extract_deps = set()
-
-
-def write_extract(writer, out, path):
-    writer.build(
-        out,
-        "extract",
-        implicit=["extract/build/extract", stampfile],
-        variables={"path": shlex.quote(path)},
-    )
-    extract_deps.add(path)
-
-
-with open("build.ninja", "w", encoding="utf8") as file:
-    writer = ninja_syntax.Writer(file)
-
-    writer.rule(
-        "extract",
-        [
-            "extract/build/extract",
-            "Content.ggpk.d/latest",
-            "$path",
-            "$out",
-        ],
-    )
-    writer.rule(
-        "dat2jsonl",
-        "bin/dat2jsonl --dat=$in --table-name=$table_name --schema=schema.min.json > $out",
-    )
-
-    write_extract(
-        writer,
-        "out/extracted/stat_descriptions.txt",
-        "metadata/statdescriptions/stat_descriptions.txt",
-    )
-
-    write_extract(
-        writer,
-        "out/extracted/tincture_stat_descriptions.txt",
-        "metadata/statdescriptions/tincture_stat_descriptions.txt",
-    )
-
-    json_files = []
-    for (table_name, datfile) in [
-        ("BaseItemTypes", "baseitemtypes"),
-        ("ActiveSkills", "activeskills"),
-        ("PassiveSkills", "passiveskills"),
-        ("SkillGems", "skillgems"),
-        ("Words", "words"),
-    ]:
-        for l, lang in [
-            ["en", ""],
-            ["tc", "traditional chinese/"],
-        ]:
-            write_dat2json(
-                writer,
-                table_name,
-                f"data/{lang}{datfile}.datc64",
-                f"out/extracted/{table_name}.{l}",
-            )
-            json_files.append(f"out/extracted/{table_name}.{l}.jsonl")
-
-    writer.rule("datrelease", "venv/bin/python scripts/datrelease.py")
-    writer.build(
-        [
-            os.path.join("out", "release", p)
-            for p in ["bases.json", "passives.json", "words.json"]
-        ],
-        "datrelease",
-        implicit=[
-            "scripts/datrelease.py",
-            *json_files,
-        ],
-    )
-
-    writer.rule(
-        "statparse",
-        "venv/bin/python scripts/statparse.py $in > $out",
-        pool="console",
-    )
-    writer.build(
-        "out/release/stat_descriptions.json",
-        "statparse",
-        [
-            "out/extracted/stat_descriptions.txt",
-            "out/extracted/tincture_stat_descriptions.txt",
-        ],
-        implicit="scripts/statparse.py",
-    )
-
-    writer.rule("charversion", "venv/bin/python scripts/charversion.py $in | tee $out")
-    writer.build(
-        "out/release/version.txt",
-        "charversion",
-        "Content.ggpk.d/latest/PathOfExile.exe",
-        implicit="scripts/charversion.py",
-    )
-
-    writer.rule("fingerprint", "venv/bin/python scripts/fingerprint.py $in | tee $out")
-    writer.build(
-        "out/release/fingerprint.txt",
-        "fingerprint",
-        [
-            "out/release/bases.json",
-            "out/release/stat_descriptions.json",
-            "out/release/words.json",
-            "out/release/passives.json",
-            "out/release/version.txt",
-        ],
-        implicit="scripts/fingerprint.py",
-    )
-
-    targets = {
-        "PathOfExile.exe",
-        "Bundles2/_.index.bin",
-    }
-    subprocess.check_call(["bin/poepatcher", *targets])
-
-    for extract_dep in extract_deps:
-        result = subprocess.run(
-            ["extract/build/extract", "Content.ggpk.d/latest", extract_dep],
-            text=True,
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-        )
-        if result.returncode:
-            print(result.stderr, file=sys.stderr)
-            result.check_returncode()
-        bundle_path = f"Bundles2/{result.stdout.strip()}.bundle.bin"
-        print(f"{extract_dep} => {bundle_path}", file=sys.stderr)
-        targets.add(bundle_path)
-
-    subprocess.check_call(["bin/poepatcher", *targets])
-
-    objects = [os.path.join("Content.ggpk.d", "latest", target) for target in targets]
-
-    writer.rule("stamp", "touch $out")
-    writer.build("out/extracted/ggpk.stamp", "stamp", implicit=objects)
diff --git a/patcher/scripts/tqdm/__init__.py b/patcher/scripts/tqdm/__init__.py
new file mode 100644
index 0000000..c70fe99
--- /dev/null
+++ b/patcher/scripts/tqdm/__init__.py
@@ -0,0 +1,12 @@
+"""Stub tqdm module for Bazel builds (no progress bar)."""
+
+
+class tqdm:
+    def __init__(self, **kwargs):
+        pass
+
+    def update(self, n=1):
+        pass
+
+    def close(self):
+        pass
diff --git a/patcher/shell.nix b/patcher/shell.nix
deleted file mode 100644
index 89c6c6d..0000000
--- a/patcher/shell.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ pkgs ? import <nixpkgs> {} }:
-
-(pkgs.buildFHSUserEnv {
-  name = "bazel-userenv-example";
-  targetPkgs = pkgs: [
-    pkgs.bash
-    pkgs.virtualenv
-    pkgs.go
-    pkgs.meson
-    pkgs.cmake
-    pkgs.ninja
-    pkgs.pkg-config
-    pkgs.libsodium
-    pkgs.simde
-    pkgs.libunistring
-    pkgs.gcc
-    pkgs.black
-  ];
-  extraOutputsToInstall = [ "dev" ];
-}).env
diff --git a/third_party/BUILD.bazel b/third_party/BUILD.bazel
new file mode 100644
index 0000000..2847e1c
--- /dev/null
+++ b/third_party/BUILD.bazel
@@ -0,0 +1,4 @@
+exports_files([
+    "libunistring.BUILD",
+    "ooz.BUILD",
+])
diff --git a/third_party/empty_gamedata/BUILD.bazel b/third_party/empty_gamedata/BUILD.bazel
new file mode 100644
index 0000000..9a33bd5
--- /dev/null
+++ b/third_party/empty_gamedata/BUILD.bazel
@@ -0,0 +1,26 @@
+# Stub gamedata repository. Override with --override_repository to provide real data.
+# All targets are marked incompatible so `bazel build //...` skips pipeline targets
+# that depend on @gamedata rather than failing.
+
+_INCOMPATIBLE = ["@platforms//:incompatible"]
+
+filegroup(
+    name = "all",
+    srcs = glob(["**"], exclude = ["BUILD.bazel", "MODULE.bazel"]),
+    target_compatible_with = _INCOMPATIBLE,
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "Bundles2/_.index.bin",
+    srcs = ["Bundles2/_.index.bin"],
+    target_compatible_with = _INCOMPATIBLE,
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "PathOfExile.exe",
+    srcs = ["PathOfExile.exe"],
+    target_compatible_with = _INCOMPATIBLE,
+    visibility = ["//visibility:public"],
+)
diff --git a/third_party/empty_gamedata/Bundles2/_.index.bin b/third_party/empty_gamedata/Bundles2/_.index.bin
new file mode 100644
index 0000000..e69de29
diff --git a/third_party/empty_gamedata/MODULE.bazel b/third_party/empty_gamedata/MODULE.bazel
new file mode 100644
index 0000000..61586d5
--- /dev/null
+++ b/third_party/empty_gamedata/MODULE.bazel
@@ -0,0 +1,6 @@
+module(
+    name = "gamedata",
+    version = "0",
+)
+
+bazel_dep(name = "platforms", version = "1.0.0")
diff --git a/third_party/empty_gamedata/PathOfExile.exe b/third_party/empty_gamedata/PathOfExile.exe
new file mode 100644
index 0000000..e69de29
diff --git a/third_party/libunistring.BUILD b/third_party/libunistring.BUILD
new file mode 100644
index 0000000..33d84c5
--- /dev/null
+++ b/third_party/libunistring.BUILD
@@ -0,0 +1,80 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
+cc_library(
+    name = "libunistring",
+    srcs = [
+        # u16_to_u8 and dependencies
+        "lib/unistr/u16-to-u8.c",
+        "lib/unistr/u16-mbtoucr.c",
+        "lib/unistr/u8-uctomb.c",
+        "lib/unistr/u8-uctomb-aux.c",
+
+        # u8_to_u16 and dependencies
+        "lib/unistr/u8-to-u16.c",
+        "lib/unistr/u8-mbtoucr.c",
+        "lib/unistr/u16-uctomb.c",
+        "lib/unistr/u16-uctomb-aux.c",
+
+        # u16_tolower and dependencies
+        "lib/unicase/u16-tolower.c",
+        "lib/unicase/u16-casemap.c",
+        "lib/unicase/tolower.c",
+        "lib/unicase/special-casing.c",
+        "lib/unicase/empty-prefix-context.c",
+        "lib/unicase/empty-suffix-context.c",
+        "lib/unicase/cased.c",
+        "lib/unicase/ignorable.c",
+        "lib/unictype/pr_soft_dotted.c",
+        "lib/unictype/combiningclass.c",
+        "lib/unistr/u16-mbtouc-unsafe.c",
+        "lib/unistr/u16-mbtouc-unsafe-aux.c",
+        "lib/unistr/u16-cpy.c",
+
+        # Stub: u16_normalize is referenced by u16_casemap but never
+        # called when nf==NULL (which is how u16_tolower invokes it).
+        "lib/u16_normalize_stub.c",
+
+        # Internal headers used by the .c files
+        "lib/unicase/caseprop.h",
+        "lib/unicase/cased.h",
+        "lib/unicase/context.h",
+        "lib/unicase/ignorable.h",
+        "lib/unicase/simple-mapping.h",
+        "lib/unicase/special-casing-table.h",
+        "lib/unicase/tolower.h",
+        "lib/unicase/u-casemap.h",
+        "lib/unicase/unicasemap.h",
+        "lib/unictype/bitmap.h",
+        "lib/unictype/combiningclass.h",
+        "lib/unictype/pr_soft_dotted.h",
+        "lib/unistr/u-cpy.h",
+        "lib/unistring-notinline.h",
+        "lib/attribute.h",
+    ],
+    hdrs = [
+        "lib/unicase.h",
+        "lib/unistr.h",
+        "lib/unitypes.h",
+        "lib/uninorm.h",
+        "lib/unictype.h",
+        "lib/unistring/cdefs.h",
+        "lib/unistring/inline.h",
+        "lib/unistring/stdint.h",
+        "lib/unistring/woe32dll.h",
+    ],
+    copts = [
+        "-DHAVE_CONFIG_H",
+        "-DIN_LIBUNISTRING",
+        "-Wno-unused-parameter",
+    ],
+    includes = [
+        ".",
+        "lib",
+    ],
+    textual_hdrs = [
+        "lib/unicase/special-casing.h",
+        "lib/unicase/special-casing.in.h",
+        "config.h",
+    ],
+    visibility = ["//visibility:public"],
+)
diff --git a/third_party/ooz.BUILD b/third_party/ooz.BUILD
new file mode 100644
index 0000000..f0522ac
--- /dev/null
+++ b/third_party/ooz.BUILD
@@ -0,0 +1,130 @@
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_shared_library")
+
+cc_library(
+    name = "libooz",
+    srcs = [
+        "bitknit.cpp",
+        "compr_entropy.cpp",
+        "compr_kraken.cpp",
+        "compr_leviathan.cpp",
+        "compr_match_finder.cpp",
+        "compr_mermaid.cpp",
+        "compr_multiarray.cpp",
+        "compr_tans.cpp",
+        "compress.cpp",
+        "kraken.cpp",
+        "lzna.cpp",
+        "stdafx.cpp",
+    ],
+    hdrs = [
+        "bits_rev_table.h",
+        "compr_entropy.h",
+        "compr_kraken.h",
+        "compr_leviathan.h",
+        "compr_match_finder.h",
+        "compr_mermaid.h",
+        "compr_util.h",
+        "compress.h",
+        "log_lookup.h",
+        "match_hasher.h",
+        "qsort.h",
+        "stdafx.h",
+        "targetver.h",
+    ],
+    copts = [
+        "-std=c++17",
+        "-Wno-unused-variable",
+        "-Wno-missing-braces",
+        "-Wno-unknown-pragmas",
+    ],
+    defines = ["OOZ_DYNAMIC"],
+    local_defines = [
+        "OOZ_BUILD_DLL",
+        # Chromium Clang's x86gprintrin.h doesn't define _rotl.
+        # Force the fallback path in stdafx.h.
+        "_rotl(x,n)=(((x)<<(n))|((x)>>(32-(n))))",
+    ],
+    visibility = ["//visibility:public"],
+    deps = ["@simde"],
+)
+
+cc_shared_library(
+    name = "libooz_so",
+    shared_lib_name = "liblibooz.so",
+    visibility = ["//visibility:public"],
+    deps = [":libooz"],
+)
+
+cc_library(
+    name = "bunutil",
+    srcs = [
+        "fnv.cpp",
+        "murmur.cpp",
+        "path_rep.cpp",
+        "utf.cpp",
+        "util.cpp",
+    ],
+    hdrs = [
+        "fnv.h",
+        "murmur.h",
+        "path_rep.h",
+        "utf.h",
+        "util.h",
+    ],
+    copts = ["-std=c++17"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@libsodium",
+        "@libunistring",
+    ],
+)
+
+cc_library(
+    name = "mio",
+    hdrs = ["libpoe/mio/single_include/mio/mio.hpp"],
+    strip_include_prefix = "libpoe/mio/single_include",
+)
+
+cc_library(
+    name = "libpoe",
+    srcs = [
+        "libpoe/poe/format/ggpk.cpp",
+        "libpoe/poe/util/install_location.cpp",
+        "libpoe/poe/util/murmur2.cpp",
+        "libpoe/poe/util/random_access_file.cpp",
+        "libpoe/poe/util/sha256.cpp",
+        "libpoe/poe/util/utf.cpp",
+    ],
+    hdrs = [
+        "libpoe/poe/format/ggpk.hpp",
+        "libpoe/poe/util/install_location.hpp",
+        "libpoe/poe/util/murmur2.hpp",
+        "libpoe/poe/util/random_access_file.hpp",
+        "libpoe/poe/util/sha256.hpp",
+        "libpoe/poe/util/utf.hpp",
+    ],
+    copts = ["-std=c++17"],
+    strip_include_prefix = "libpoe",
+    visibility = ["//visibility:public"],
+    deps = [
+        ":mio",
+        "@libsodium",
+        "@libunistring",
+    ],
+)
+
+cc_library(
+    name = "libbun",
+    srcs = ["bun.cpp"],
+    hdrs = ["bun.h"],
+    copts = ["-std=c++17"],
+    defines = ["BUN_DYNAMIC"],
+    includes = ["."],
+    linkopts = ["-ldl"],
+    local_defines = ["BUN_BUILD_DLL"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":bunutil",
+        ":libpoe",
+    ],
+)
diff --git a/third_party/patches/BUILD.bazel b/third_party/patches/BUILD.bazel
new file mode 100644
index 0000000..3246f65
--- /dev/null
+++ b/third_party/patches/BUILD.bazel
@@ -0,0 +1,4 @@
+exports_files([
+    "libunistring_bazel.patch",
+    "ooz_add_module.patch",
+])
diff --git a/third_party/patches/libunistring_bazel.patch b/third_party/patches/libunistring_bazel.patch
new file mode 100644
index 0000000..b219b30
--- /dev/null
+++ b/third_party/patches/libunistring_bazel.patch
@@ -0,0 +1,56 @@
+diff --git a/MODULE.bazel b/MODULE.bazel
+new file mode 100644
+--- /dev/null
++++ b/MODULE.bazel
+@@ -0,0 +1,6 @@
++module(
++    name = "libunistring",
++    version = "1.3",
++)
++
++bazel_dep(name = "rules_cc", version = "0.2.14")
+diff --git a/config.h b/config.h
+new file mode 100644
+--- /dev/null
++++ b/config.h
+@@ -0,0 +1,21 @@
++/* Minimal config.h for Bazel build of libunistring subset. */
++#ifndef _LIBUNISTRING_CONFIG_H
++#define _LIBUNISTRING_CONFIG_H
++
++#define _GL_CONFIG_H_INCLUDED 1
++
++#include <stdbool.h>
++
++#if __has_attribute(__nonstring__)
++# define _GL_ATTRIBUTE_NONSTRING __attribute__ ((__nonstring__))
++#else
++# define _GL_ATTRIBUTE_NONSTRING
++#endif
++
++#if __has_attribute(__fallthrough__)
++# define _GL_ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__))
++#else
++# define _GL_ATTRIBUTE_FALLTHROUGH
++#endif
++
++#endif /* _LIBUNISTRING_CONFIG_H */
+diff --git a/lib/u16_normalize_stub.c b/lib/u16_normalize_stub.c
+new file mode 100644
+--- /dev/null
++++ b/lib/u16_normalize_stub.c
+@@ -0,0 +1,14 @@
++/* Stub: u16_normalize is referenced by u16_casemap but never called
++   when nf==NULL (which is how u16_tolower uses it). */
++#include <stdint.h>
++#include <stddef.h>
++#include <stdlib.h>
++
++uint16_t *
++u16_normalize(const void *nf, const uint16_t *s, size_t n,
++              uint16_t *resultbuf, size_t *lengthp)
++{
++    (void)nf; (void)s; (void)n; (void)resultbuf; (void)lengthp;
++    abort();
++    return ((void*)0);
++}
diff --git a/third_party/patches/ooz_add_module.patch b/third_party/patches/ooz_add_module.patch
new file mode 100644
index 0000000..55b00cd
--- /dev/null
+++ b/third_party/patches/ooz_add_module.patch
@@ -0,0 +1,12 @@
+--- /dev/null
++++ MODULE.bazel
+@@ -0,0 +1,9 @@
++module(
++    name = "ooz",
++    version = "0",
++)
++
++bazel_dep(name = "rules_cc", version = "0.2.14")
++bazel_dep(name = "libsodium", version = "1.0.19")
++bazel_dep(name = "simde", version = "0.8.2")
++bazel_dep(name = "libunistring", version = "1.3")