diff --git a/LICENCE b/LICENCE
index ab42830..92b012c 100644
--- a/LICENCE
+++ b/LICENCE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2024, flashwave <me@flash.moe>
+Copyright (c) 2019-2025, flashwave <me@flash.moe>
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/README.md b/README.md
index 941ccdf..6b18574 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
 # Hanyuu
 
-Hanyuu is the identity and authorisation server for Flashii.
+Hanyuu *was* the identity and authorisation server for Flashii.
+Its functionality has been absorbed by the main [Misuzu](https://patchii.net/flashii/misuzu) codebase.
diff --git a/assets/oauth2.js/authorise.js b/assets/oauth2.js/authorise.js
index ee47be0..9dba5b8 100644
--- a/assets/oauth2.js/authorise.js
+++ b/assets/oauth2.js/authorise.js
@@ -1,4 +1,5 @@
 #include loading.jsx
+#include sfx.js
 #include app/info.jsx
 #include app/scope.jsx
 #include header/header.js
diff --git a/assets/oauth2.js/sfx.js b/assets/oauth2.js/sfx.js
new file mode 100644
index 0000000..1e38a1f
--- /dev/null
+++ b/assets/oauth2.js/sfx.js
@@ -0,0 +1,76 @@
+const HanyuuOAuth2Sfx = (() => {
+    const sfxPath = document.createElement('audio').canPlayType('audio/ogg;codecs=opus') !== ''
+        ? '/static/hanyuu.opus'
+        : '/static/hanyuu.caf';
+
+    const sfxList = {
+        'signal-search': [0.549, 2.424],
+        'menu-open': [2.606, 1.469],
+        'menu-close': [4.076, 1.127],
+        'menu-error': [5.203, .192],
+        'type': [5.332, .125],
+        'tiny-click': [5.457, .053],
+        'invalid': [5.510, .232],
+        'settings-menu': [5.742, .429],
+        'settings-open': [6.171, .196],
+        'settings-close': [6.367, .232],
+        'option-up': [6.599, .097],
+        'option-down': [6.696, .093],
+    };
+
+    const audioCtx = (() => {
+        const audioCtxObj = window.AudioContext || window.webkitAudioContext;
+        try {
+            return new audioCtxObj({ latencyHint: 'playback' });
+        } catch(ex) {
+            return new audioCtxObj;
+        }
+    })();
+
+    let sndSpriteBuffer;
+    const playSound = async (name, loop) => {
+        if(audioCtx.state !== 'running')
+            await audioCtx.resume();
+
+        if(sndSpriteBuffer === undefined)
+            sndSpriteBuffer = await audioCtx.decodeAudioData(
+                (await $x.get(sfxPath, { type: 'arraybuffer' })).body()
+            );
+
+        const sfx = sfxList[name];
+        if(!Array.isArray(sfx))
+            throw 'sound does not exist';
+
+        const source = new AudioBufferSourceNode(audioCtx, {
+            buffer: sndSpriteBuffer,
+        });
+        source.connect(audioCtx.destination);
+
+        if(loop) {
+            source.loop = true;
+            source.loopStart = sfx[0];
+            source.loopEnd = sfx[1];
+            source.start();
+        } else
+            source.start(0, sfx[0], sfx[1]);
+
+        return source;
+    };
+
+    const playOnce = async name => {
+        // might want to add like random pitch or something later
+        await playSound(name);
+    };
+
+    const playLoop = async name => {
+        const source = await playSound(name, true);
+        const stop = () => { source.stop(); };
+
+        return { stop };
+    };
+
+    return {
+        playOnce,
+        playLoop,
+    };
+})();
diff --git a/public/static/hanyuu.caf b/public/static/hanyuu.caf
new file mode 100644
index 0000000..5e3f861
Binary files /dev/null and b/public/static/hanyuu.caf differ
diff --git a/public/static/hanyuu.opus b/public/static/hanyuu.opus
new file mode 100644
index 0000000..fc69061
Binary files /dev/null and b/public/static/hanyuu.opus differ
diff --git a/src/OAuth2/OAuth2ErrorRoutes.php b/src/OAuth2/OAuth2ErrorRoutes.php
deleted file mode 100644
index e69de29..0000000