Frostbyte's Slabs & Stairs

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

Evidence

Ran on Kiln's test stand (2026-11-04): SlabsAndStairs did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/block/SimpleWaterloggedBlock; SlabsAndStairsClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/color/block/BlockTintSource.

What it needs from Kiln

an access widener
Mixin
net.fabricmc.fabric.api.client.rendering.v1.BlockColorRegistry
net.fabricmc.fabric.api.creativetab.v1.FabricCreativeModeTab
net.fabricmc.fabric.api.item.v1.BlockTransformerHelper
net.fabricmc.fabric.api.registry.OxidizableBlocksRegistry
net.minecraft.client.color.block.BlockTintSource
net.minecraft.client.renderer.BiomeColors
net.minecraft.core.particles.BlockParticleOption
net.minecraft.core.particles.ParticleTypes
net.minecraft.server.MinecraftServer
net.minecraft.tags.BlockTags
net.minecraft.tags.EnchantmentTags
net.minecraft.util.ColorRGBA
net.minecraft.util.ParticleUtils
net.minecraft.world.attribute.EnvironmentAttributeSystem
net.minecraft.world.attribute.EnvironmentAttributes
net.minecraft.world.entity.item.FallingBlockEntity
net.minecraft.world.item.CreativeModeTab.Builder
net.minecraft.world.item.CreativeModeTab.DisplayItemsGenerator
net.minecraft.world.item.CreativeModeTab.ItemDisplayParameters
net.minecraft.world.item.CreativeModeTab.Output
net.minecraft.world.item.context.DirectionalPlaceContext
net.minecraft.world.item.enchantment.EnchantmentHelper
net.minecraft.world.level.BlockGetter
net.minecraft.world.level.LightLayer
net.minecraft.world.level.block.ButtonBlock
net.minecraft.world.level.block.ColorCollection
net.minecraft.world.level.block.ConcretePowderBlock
net.minecraft.world.level.block.Fallable
net.minecraft.world.level.block.FallingBlock
net.minecraft.world.level.block.FallingParticlesLeavesBlock
net.minecraft.world.level.block.FenceBlock
net.minecraft.world.level.block.FenceGateBlock
net.minecraft.world.level.block.IceBlock
net.minecraft.world.level.block.PressurePlateBlock
net.minecraft.world.level.block.SimpleWaterloggedBlock
net.minecraft.world.level.block.SlabBlock
net.minecraft.world.level.block.StairBlock
net.minecraft.world.level.block.WallBlock
net.minecraft.world.level.block.WeatheringCopper
net.minecraft.world.level.block.WeatheringCopper.WeatherState
and 77 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

Adds slabs, stairs, walls, fences, and more non-full block variants of many vanilla blocks.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file slabsandstairs-1.15.3-26.3.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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