- Loaders
- FabricNeoForge
- Downloads on Modrinth
- 13.8K
- Followers on Modrinth
- 41
- versions
- 40
- Updated
- October 8, 2026Oct 8
- Published
- in 2025
At a glance
Needed both in the game and on the server
The Nether has always been dangerous... but it's never been this alive.

Pyrellium is a content-rich expansion mod that introduces 9 brand new biomes, seamlessly integrated with the vanilla Nether for a natural and immersive experience. Whether you're an explorer, builder, or survivalist, Pyrellium offers new challenges and rewards deep within the fiery realm.

Flaming Forests
Discover blazing biomes, and obtain new spoils. But watch out, even the flora is out to harm you.

Icy Depths
Find chilling places where frostbite meets fire. These treacherous frozen lands are as beautiful as they are deadly.

Spider Sanctuaries
Venture into eerie caverns where intelligent spiders spin homes of silk and secrets. Tread carefully. You're not alone.

Calming hopes
Not every biome is deadly, venture into the crystal forest to enjoy lands of beauty. and take a break from the danger.

And More!

Forge?
Pyrellium is fully compatible with sinytra connector, use that for playing pyrellium on forge.
Since version 0.4.0, Pyrellium does have a native neoforge version for minecraft 1.21.1
Is this compatible with X mod?
Pyrellium was built with compatibility in mind. It works alongside all major Nether mods and fits naturally into both vanilla and modded environments.
Will you be adding more biomes or features?
Pyrellium is currently in beta, this means more features are on the way. Adding more biomes itself will be unlikely, but stay tuned for new mobs, items, and other features.
Hey this looks a lot like Lankasters Nether.
Yes. Pyrellium started as Lankasters Nether, but eventually grew to big to be just a datapack, and it was decided to switch over to making a mod. Lankasters Nether is still available as it's own project for archiving purposes, but it is recommended where possible to use Pyrellium instead.
FAQ
How to install Pyrellium?
Install Fabric for your Minecraft version, download Pyrellium for the same version and loader, put the file into the mods folder and launch the game with the loader profile.
Which Minecraft versions does Pyrellium support?
Pyrellium has builds for Minecraft 1.20–1.20.2, 1.21.1, 1.21.11.
Is Pyrellium needed on the server?
Needed in the game and on the server