Herzium

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): HerziumClient did not start: java.lang.NoSuchMethodError: 'boolean net.fabricmc.loader.api.FabricLoader.isModLoaded(java.lang.String)'.

What it needs from Kiln

Mixin
com.mojang.blaze3d.platform.InputConstants.Key
net.minecraft.client.Options
net.minecraft.network.protocol.game.ServerboundInteractPacket
net.minecraft.network.protocol.game.ServerboundPlayerActionPacket
net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.Action
net.minecraft.network.protocol.game.ServerboundSetCarriedItemPacket
net.minecraft.network.protocol.game.ServerboundUseItemOnPacket
net.minecraft.network.protocol.game.ServerboundUseItemPacket
net.minecraft.tags.ItemTags
net.minecraft.world.entity.player.Inventory
net.minecraft.world.item.ProjectileWeaponItem
net.minecraft.world.item.ShieldItem
FabricLoader.isModLoaded()
KeyMapping.isDown()
Minecraft.gameMode
Minecraft.options
Gui.overlay()
LocalPlayer.getInventory()
LocalPlayer.hasInfiniteMaterials()
Holder.is()
Holder.Reference.is()
Item.builtInRegistryHolder()
ItemStack.is()
ItemStack.is()
ItemStack.setPopTime()
ItemStack.typeHolder()
Items.DIAMOND_SWORD
Items.MACE
Items.TOTEM_OF_UNDYING

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

Your hotbar switches on the very next frame, and you choose which slot wins.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file herzium-26.3-1.12.1.jar. The scan reads the mod's classes; it does not run them.

Reports from players

No reports from players yet.

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