diff --git a/public/audio/bgm/graveyard.mp3 b/public/audio/bgm/graveyard.mp3
index 48092fa3ec2..45571f16d09 100644
Binary files a/public/audio/bgm/graveyard.mp3 and b/public/audio/bgm/graveyard.mp3 differ
diff --git a/src/field/arena.ts b/src/field/arena.ts
index 09faee49d56..b053a3d056a 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -794,7 +794,7 @@ export class Arena {
       case Biome.VOLCANO:
         return 17.637;
       case Biome.GRAVEYARD:
-        return 3.232;
+        return 13.711;
       case Biome.DOJO:
         return 6.205;
       case Biome.FACTORY: