Nightmare (The Shadow)

2.1.2 — Forge 1.20.1 Port

Minecraft 1.20.1 + Forge 47.4.20 · Requires Java 17

A full backport to the most popular legacy Minecraft version. No gameplay changes — every feature and balance value from 2.1.x carries over unchanged. This is purely a loader/version conversion.

Loader & toolchain

• Switched to Forge. NeoForge has no 1.20.1 build (its line starts at 1.20.2), so this release runs on Minecraft Forge 47.4.20. Players need Forge for 1.20.1, not NeoForge.
• Build system → ForgeGradle 6 (Gradle 8.8), Java 17 toolchain (down from Java 25).
• mods.toml (Forge format) replaces neoforge.mods.toml.

Loader APIs (net.neoforged.* → net.minecraftforge.*)

• Registration → Forge DeferredRegister + RegistryObject + ForgeRegistries.
• Config → ForgeConfigSpec; spawn egg → ForgeSpawnEggItem.
• Entrypoint → FMLJavaModLoadingContext; event bus → MinecraftForge.EVENT_BUS.
• Events remapped: TickEvent.LevelTickEvent, MobSpawnEvent.FinalizeSpawn, BlockEvent.EntityPlaceEvent, PlayerEvent.*, EntityAttributeCreationEvent, BuildCreativeModeTabContentsEvent.

Vanilla API downgraded to 1.20.1

• ResourceLocation (new ResourceLocation(ns, path)) replaces Identifier.
• Persistent data uses the CompoundTag SavedData API (save/load), not the codec SavedDataType.
• Attribute modifiers use UUIDs with MULTIPLY_BASE.
• Entity overrides reverted: hurt(...), doHurtTarget(Entity), customServerAiStep(), defineSynchedData(), CompoundTag NBT.
• Day-time via ServerLevel.setDayTime(...); spawning via MobSpawnType + EntityType.create(Level).
• Entity-based rendering restored (HumanoidMobRenderer<ShadowEntity, ShadowModel>); render-state classes removed.
• Gold check via Tiers.GOLD; Smite via direct Enchantments.SMITE; MobEffects.MOVEMENT_SPEED.
• Data folders back to plural 1.20.1 names (loot_tables/, advancements/).

Output

• nightmare-2.1.2-forge-1.20.1.jar