Legacy Skyblock

Evidence

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

What it needs from Kiln

• Mixin
• com.mojang.authlib.GameProfile
• com.mojang.authlib.properties.Property
• com.mojang.authlib.properties.PropertyMap
• com.mojang.blaze3d.platform.InputConstants.Key
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.blaze3d.vertex.PoseStack.Pose
• com.mojang.blaze3d.vertex.VertexConsumer
• com.mojang.math.Axis
• net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback
• net.fabricmc.fabric.api.client.command.v2.ClientCommands
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStarted
• net.fabricmc.fabric.api.client.item.v1.ItemTooltipCallback
• net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents
• net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents.Game
• net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents.ModifyGame
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderContext
• net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderEvents
• net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderEvents.AfterTranslucentFeatures
• net.fabricmc.fabric.mixin.client.keymapping.KeyMappingAccessor
• net.minecraft.client.Camera
• net.minecraft.client.OptionInstance
• net.minecraft.client.Options
• net.minecraft.client.gui.Font.DisplayMode
• net.minecraft.client.gui.screens.inventory.ContainerScreen
• net.minecraft.client.multiplayer.PlayerInfo
• net.minecraft.client.renderer.GameRenderer
• net.minecraft.client.renderer.OrderedSubmitNodeCollector
• net.minecraft.client.renderer.SubmitNodeCollector
• net.minecraft.client.renderer.SubmitNodeCollector.CustomGeometryRenderer
• net.minecraft.client.renderer.rendertype.RenderTypes
• net.minecraft.core.component.DataComponents
• net.minecraft.nbt.CompoundTag
• net.minecraft.nbt.ListTag
• net.minecraft.nbt.StringTag
• net.minecraft.nbt.Tag
• net.minecraft.network.chat.FormattedText
• net.minecraft.network.chat.FormattedText.StyledContentConsumer
• and 41 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4), Mixin (0.5)

In the author's words

Modern Hypixel Skyblock mod aimed to port features from 1.8.9 mods

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file LegacySkyblock-2.8.0-26.3+_fabric.jar. The scan reads the mod's classes; it does not run them.