Tectonic Layers 2.1.0 Beta - Native Stack Update

This is the biggest Tectonic Layers update so far.

The Nether and the End are no longer just “copied” into the Overworld. They now generate as native stacked layers, keeping their real terrain shape, biomes, decorations, structures, mobs, fog, portals, and End fight behavior inside one connected vertical world.

Highlights

• Native Nether and End terrain generation inside the stacked Overworld.
• Configurable stack order: swap Nether and End positions while keeping the Overworld as the playable anchor.
• Optional layer removal: create worlds without the Nether layer or without the End layer.
• Better support for modded Nether/End content, including BetterNether structures and decorations.
• Vanilla and modded structures now generate in their correct stacked layer.
• /locate now points to the stacked version of structures instead of empty native coordinates.
• End dragon fight, End crystals, obsidian pillars, End city content, and shulkers work inside the stacked End layer.
• Improved Nether/End mob spawning in their real layers.
• Better portal routing between stacked layers, with safer arrival positions.
• New pre-world stack configuration screen.
• Overworld height override from the UI.
• Boundary mode options for layer transitions: Auto, Islands / void, and Caves / blend.
• Faster chunk generation and loading through cached native generation contexts.
• Fixed several crashes around dragon pathing and chunk loading.
• Fixed many cases of Nether/End content bleeding into the Overworld.

Compatibility

Required:

• Minecraft 1.21.1
• NeoForge
• Tectonic
• Lithostitched

Optional but supported:

• Amplified Nether
• BetterNether / BCLib
• Other Nether or End worldgen mods may work, but are still experimental.

Amplified Nether is no longer required. If it is installed, Tectonic Layers will respect its Nether height and generate the stacked Nether accordingly.

Important beta note

This update changes world generation heavily. For the best experience, create a new world.

Existing worlds may contain old chunks from previous beta layouts, especially around Nether/End layers, structures, and portals. Back up your worlds before updating.