Mob Spawn Control

Evidence

Ran on Kiln's test stand (2026-11-04): ViperSpawnControl did not start: java.lang.NoSuchFieldError: Class net.fabricmc.fabric.api.loot.v3.LootTableEvents does not have member field 'net.fabricmc.fabric.api.event.Event MODIFY_DROPS'.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.biome.v1.BiomeModifications
• net.fabricmc.fabric.api.biome.v1.BiomeSelectors
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.loot.v3.LootTableEvents.ModifyDrops
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.SharedSuggestionProvider
• net.minecraft.core.RegistryAccess
• net.minecraft.core.component.DataComponents
• net.minecraft.server.MinecraftServer
• net.minecraft.world.entity.EntitySpawnReason
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.Mob
• net.minecraft.world.entity.ai.attributes.AttributeModifier
• net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation
• net.minecraft.world.level.storage.loot.LootContext
• net.minecraft.world.level.storage.loot.parameters.LootContextParams
• LootTableEvents.MODIFY_DROPS
• BuiltInRegistries.ENTITY_TYPE
• Registries.BIOME
• Identifier.tryParse()
• ServerLevel.addFreshEntity()
• ServerLevel.getAllEntities()
• ServerLevel.getBiome()
• ServerLevel.getCurrentDifficultyAt()
• ServerLevel.getDefaultClockTime()
• ServerLevel.getMaxLocalRawBrightness()
• ServerLevel.getNearestPlayer()
• ServerLevel.isBrightOutside()
• ServerLevel.isDarkOutside()
• ServerLevel.isRaining()
• ServerLevel.isThundering()
• Entity.discard()
• Entity.distanceToSqr()
• Entity.getType()
• AttributeInstance.addOrReplacePermanentModifier()
• ItemStack.copyWithCount()
• ItemStack.getOrDefault()

On the roadmap: Code next to data (0.3), Mixin (0.5)

In the author's words

This mod gives you complete control over mob spawning with per-rule filters, category caps, loot/XP scaling, attribute multipliers, and mob replacement — no coding required, just edit the JSON config and reload. 🔌✨

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file viper-spawn-control-26.3-1.0.0.jar. The scan reads the mod's classes; it does not run them.