Return by Death

Evidence

Ran on Kiln's test stand (2026-11-04): ReturnByDeath did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/command/v2/CommandRegistrationCallback.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.entity.event.v1.EntitySleepEvents
• net.fabricmc.fabric.api.entity.event.v1.EntitySleepEvents.StopSleeping
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AfterDamage
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AllowDamage
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AllowDeath
• net.fabricmc.fabric.api.event.lifecycle.v1.EntityLoadData
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents.Load
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerEntityEvents.AllowLoad
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• net.minecraft.advancements.Advancement
• net.minecraft.advancements.DisplayInfo
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.arguments.EntityArgument
• net.minecraft.core.GlobalPos
• net.minecraft.core.RegistryAccess
• net.minecraft.core.RegistryAccess.Frozen
• net.minecraft.nbt.CompoundTag
• net.minecraft.network.chat.Style
• net.minecraft.server.MinecraftServer
• net.minecraft.server.PlayerAdvancements
• net.minecraft.server.ServerAdvancementManager
• net.minecraft.server.level.ServerPlayer.RespawnConfig
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.server.permissions.PermissionLevel
• net.minecraft.server.players.PlayerList
• net.minecraft.stats.ServerRecipeBook
• net.minecraft.stats.ServerStatsCounter
• net.minecraft.stats.Stat
• net.minecraft.stats.StatType
• net.minecraft.tags.DamageTypeTags
• net.minecraft.util.ProblemReporter
• net.minecraft.util.StringRepresentable.EnumCodec
• net.minecraft.world.SimpleContainer
• net.minecraft.world.clock.ServerClockManager
• and 80 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

A Fabric singleplayer rollback mod that restores your world, player, and entities to the latest checkpoint when death would happen.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file return-by-death-1.2.3.jar. The scan reads the mod's classes; it does not run them.