Ultimate Battle Music

Evidence

Ran on Kiln's test stand (2026-11-04): UltimateBattleMusicClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/client/networking/v1/ClientPlayConnectionEvents.

What it needs from Kiln

• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.minecraft.client.gui.Hud
• net.minecraft.client.gui.components.BossHealthOverlay
• net.minecraft.client.gui.components.LerpingBossEvent
• net.minecraft.client.resources.sounds.AbstractSoundInstance
• net.minecraft.client.resources.sounds.SoundInstance
• net.minecraft.client.resources.sounds.TickableSoundInstance
• net.minecraft.client.sounds.MusicManager
• net.minecraft.client.sounds.SoundEngine
• net.minecraft.client.sounds.SoundEngine.PlayResult
• net.minecraft.client.sounds.SoundManager
• net.minecraft.network.chat.contents.TranslatableContents
• net.minecraft.tags.EntityTypeTags
• net.minecraft.tags.FluidTags
• net.minecraft.tags.TagKey
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.Mob
• net.minecraft.world.entity.boss.enderdragon.EnderDragon
• net.minecraft.world.entity.boss.wither.WitherBoss
• net.minecraft.world.entity.monster.Blaze
• net.minecraft.world.entity.monster.Creeper
• net.minecraft.world.entity.monster.ElderGuardian
• net.minecraft.world.entity.monster.Ghast
• net.minecraft.world.entity.monster.Guardian
• net.minecraft.world.entity.monster.Phantom
• net.minecraft.world.entity.monster.Ravager
• net.minecraft.world.entity.monster.Vex
• net.minecraft.world.entity.monster.Witch
• net.minecraft.world.entity.monster.breeze.Breeze
• net.minecraft.world.entity.monster.cubemob.MagmaCube
• net.minecraft.world.entity.monster.cubemob.Slime
• net.minecraft.world.entity.monster.hoglin.Hoglin
• net.minecraft.world.entity.monster.illager.Evoker
• net.minecraft.world.entity.monster.illager.Illusioner
• net.minecraft.world.entity.monster.illager.Pillager
• net.minecraft.world.entity.monster.illager.Vindicator
• net.minecraft.world.entity.monster.piglin.Piglin
• net.minecraft.world.entity.monster.piglin.PiglinBrute
• net.minecraft.world.entity.monster.skeleton.Bogged
• and 24 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3)

In the author's words

Adds Battle music to the game!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file ultimate_battle_music-26.3.jar. The scan reads the mod's classes; it does not run them.