Nether Expansion

Nether Expansion

This mod adds several new biomes, mobs, blocks, and even water to the nether

by
245 Downloads
neoforgeadventureworldgen
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Screenshots

Toxic Wastes
Armor
All The Nylium
Wet Forest
Old Nether
Tropical Nether

About this Mod

What the Mod is about

Nether Expansion is a mod that seeks to expand upon the nether and adds new mobs, biomes, blocks, ores, and places to find water in the nether(yes I'm serious).

There are currently 9 new biomes:

Toxic Wastes

Electric Forest

Wet Forest(where the water is)

Nether Desert

Volcanic Wasteland

Lushios Forest

Nether Plains

Frosty Lands

Nether Dripstone caves

And 8 new mobs

Piglin Assassin

Wisp

Radioactive Dweller

Nether Zombie

Nether Creeper

Acidic Walker

Lava Walker

Magma Walker

There are also several new dimensions that are variants of the nether

Acidic nether, an expansion on the toxic delta biome, with two more biomes, the acidic plains and deltas

Overnether, a corrupted version of the overworld, it has all the vanilla nether biomes but without the nether roof

Modded Overnether, the same thing as the overnether but with modded biomes

Dark Nether, the nether if it was dark just like in alpha

Modded Dark nether, modded nether but dark

Floating Nether, the nether but with floating islands, but due to the way biomes in dimensions with end like terrain work, not all biomes spawn, even though it's entirely vanilla biomes, this bug can't be fixed

Floating Modded Nether, same thing but modded biomes, not all biomes will spawn

Modded Nether, the oldest variant of the nether, it was added in 1.0.0 as a home for all the modded nether biomes without any vanilla biomes to override

Tropical Nether, it's lush here, looks nothing like the nether

Amplified Nether, meant to be double the original height, but because I failed to do this, it's just a vanilla nether for now

Currently there is only one new structure, the Nether Tower structure, but I plan to add more in the future

There are also 4 new ores, Aventurine, Infernal, Acidic, and Sapphire. This mod is no longer in beta but still expect more things to be added until I can't update it anymore due to the same thing that happened with my end update mod and winter mod

this mod was made with mcreator even though it doesn't really look like a typical mcreator mod, hopefully that excuses why there's extra dimensions

I made a video on the mod, watch it here

I am aware of a bug that makes the nether wastes biome have grass blocks on the surface instead of netherrack within modded dimensions, this has nothing to do with this mod itself, it affects other mods as well, this bug is only fixable by creating a custom nether wastes biome

Available Versions

Nether Expansion 1.2.13release
MC 1.21.7, 1.21.8neoforge
May 31, 2026
Nether Expansion 1.2.12release
MC 1.21.7, 1.21.8neoforge
April 12, 2026
Nether Expansion 1.2.11release
MC 1.21.7, 1.21.8neoforge
April 11, 2026
Nether Expansion 1.2.10release
MC 1.21.4neoforge
February 11, 2026
Nether Expansion 1.2.9release
MC 1.21.4neoforge
January 31, 2026

How to Install Nether Expansion on Your Server

1

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

2

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.8).

3

Install Mod

Open the mod browser in the dashboard and search for "Nether Expansion". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.8, 1.21.7, 1.21.4

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Nether Expansion server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.8). You can switch loaders with one click in the panel.

Is Nether Expansion compatible with neoforge?

Nether Expansion officially supports neoforge for Minecraft 1.21.8, 1.21.7, 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Nether Expansion – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Nether Expansion consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Nether Expansion with just one click on your server.

Recommended RAM
6 GBab €12/mo
Min. 4 GB | +1 GB pro 5 Spieler
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NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.81.21.71.21.4