Amethyst Nether
by bbschef
Amethyst Nether is a datapack that reshapes the Nether with new biomes, structures, mobs, items and terrain, and it runs on Fabric, Forge, NeoForge and Quilt.
What it does
The datapack changes the Nether's appearance by adding biomes and structures and by modifying existing vanilla biomes. Terrain is reshaped through custom density settings that carve the dimension into rivers, caves and canyons, giving it a more cavernous shape. New ore distributions are included as well, so mining routes differ from the standard Nether.
Gameplay content comes with the datapack: mobs, items, recipes and advancements, some of them craftable or functional. Spawn weights for mobs in each biome can be edited in the biome files, and a custom entity can be removed from generation by changing its entry. The author recommends that the spawn weights of each biome total 100. Server owners install it on the server; players only need to join the world. Installation requires the mod on the server and is published for 1.21.4 – 26.3, with the latest file, v4.4+mod for 26.3, released on 2026-09-16. The mod is released under a custom license and is not open source.
Key features
New Nether biomes
Custom biomes are added, and several vanilla Nether biomes are modified to fit the new terrain.
Cavernous terrain
Custom noise and density functions reshape the Nether into rivers, caves and canyons.
Structures and templates
New structures and their templates generate in the dimension, including custom variants.
Crafting and functional items
New craftable and functional items come with the content, with their own recipes and advancements.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x7 of 7 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who want a reshaped Nether and players who play on that server. It suits worlds that already run the datapack or are set up for it from the start.
How it compares
Amethyst Caves is a server-side mod for 1.21.5 that adds cave content, licensed under Creative Commons Attribution Non Commercial 4.0 and not open source. Multi Biomes Compatibility is a server-side tool for 1.21.6 – 26.2 that helps biomes from several mods coexist, and it is licensed as All rights reserved. Unbiased Worldgen covers 1.21 – 26.2 and is released under the MIT License, while Amethyst Nether targets a different set of game versions and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Amethyst Nether | Fabric, Forge, NeoForge and Quilt | 1.21.4 – 26.3 | Server required, client optional | 2026-09-16 |
| Amethyst Caves | Fabric, Forge, NeoForge and Quilt | 1.21.5 | Server required, client optional | 2025-04-06 |
| Multi Biomes Compatibility | Fabric, Forge, NeoForge and Quilt | 1.21.6 – 26.2 | Server required, client optional | 2026-07-07 |
| Unbiased Worldgen | Fabric, Forge, NeoForge and Quilt | 1.21 – 26.2 | Server required, client optional | 2026-06-16 |
Questions
Does Amethyst Nether need a specific loader?
Does a player need to install Amethyst Nether?
Which game versions does Amethyst Nether support?
In the catalog
Amethyst Nether is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 8,071 mods support Minecraft 26.3.
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What the author says
Amethyst Nether is a datapack and mod that transforms the Nether by giving it a new appearance, adding biomes, structures, mobs, items, recipes, advancements, and more. World generation uses custom noise values and density functions to modify the terrain, giving it a more cavernous appearance. It includes rivers…
Official listing
- Modrinth page
- modrinth.com/mod/amethyst-nether
- Owner
- bbschef
- Published
- 2025-01-02
- Updated on Modrinth
- 2026-09-16
- Facts verified
- 2026-10-15