
Modrinth · Minecraft mod
Pyrellium
The vanilla+ nether overhaul
Quick answer
Which Pyrellium release should I use?
Pyrellium 0.4.0-1.21.11 targets 1.21.11 with Fabric. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is Pyrellium required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does Pyrellium 0.4.0-1.21.11 need?
0.4.0-1.21.11. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Pyrellium without breaking your instance.
Built for Pyrellium 0.4.0-1.21.11. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 0.4.0-1.21.11. It targets 1.21.11 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 0.4.0-1.21.11. It opens that exact file at the source.
About this project
What does Pyrellium add?
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!
Click the image below to be taken to Bisect's website

Forge?
Pyrellium is fully compatible with sinytra connector, use that for playing pyrellium on forge.
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.
Project description from Modrinth.
Pick your setup
Pyrellium by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader build1.20.2
1 loader build1.20.1
1 loader build1.20
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Pyrellium versions and loaders
0.4.0-1.21.11
pyrellium-0.4.0-1.21.11.jar
14 Aug 2026
0.4.0-1.21.1
pyrellium-0.4.0-1.21.1.jar
14 Aug 2026
0.4.0-1.20.1
pyrellium-0.4.0-1.20.1.jar
14 Aug 2026
0.3.3-1.21.11
pyrellium-0.3.3-1.21.11.jar
25 Jun 2026
0.3.3-1.21.1
pyrellium-0.3.3-1.21.1.jar
25 Jun 2026
0.3.3-1.20.1
pyrellium-0.3.3-1.20.1.jar
25 Jun 2026
0.3.2-1.21.11
pyrellium-0.3.2-1.21.11.jar
11 Jun 2026
0.3.2-1.21.1
pyrellium-0.3.2-1.21.1.jar
11 Jun 2026
0.3.2
pyrellium-0.3.2.jar
11 Jun 2026
0.3.1-1.21.11
pyrellium-0.3.1-1.21.11.jar
12 Apr 2026
0.3.1-1.21.1
pyrellium-0.3.1-1.21.1.jar
26 Mar 2026
0.3.1
pyrellium-0.3.1.jar
26 Mar 2026
Looking for an older file? The official Modrinth project page is in Resources.