Source-checkedWorld generation

Lavaflow

by jacobsjo · for Minecraft

Completely overhauled Nether: Lava rivers on 2 heights with lavafalls between them, proper valleys, oceans, and new biomes and structures.

13KDownloads
11 mo agoLast updated
AGPL-3.0-or-laterLicense
Data pack · Fabric +2Loaders

About Lavaflow

From Modrinth

Completely overhauled Nether: Lava rivers on 2 heights with lavafalls between them, proper valleys, oceans, and new biomes and structures.

Lavaflow ======== Buy me a coffee GitHub Issues Datapack Map

This datapack is still in beta. Future (and frequent) changes that cause chunk borders in existing worlds are likely. Use at your own risk

Lavaflow completely overhauls the nether. Instead of the random noise of the vanilla nether, Lavaflow features specifically crafted terrain, like you are used to from the overworld - but way more 3d. Biomes are placed not at random but in places matching the terrain.

You can view a map of the biome distribution, terrain, and structure locations on map.jacobsjo.eu.

A view down to a nether fortress. In the forground is a lava river at higher elevations.

Find the high elevation lava rivers among crimson and warped forests. Among them some warped forests have grown older and taller then ever before.

Follow the rivers them down the lavafalls into canyons and valleys. Among the soul sand valleys, a new forest is thriving (?): The Ghost Forest.

Follow the rivers further to their mouth into lava oceans: Vast areas of lava overlooked by narrow layer above, on which the nether forests have ventured onto. Massive pillars support the ceiling. Legend has it that they were once of high demand with miners.

Where there isn't a valley or ocean, you smaller caves take their place. These seem to have formed more recently and might expose what is otherwise well hidden.

The vanilla structures tie the terrain together. While almost unmodified in structure, their placement is chosen to enhance the terrain. This includes different placement for each Bastion Remnant type.


Beta:

This datapack is still in beta. Especially, I welcome feedback on ore rates and structure frequency. I might also add more biomes and structures before the full release.


Additional notes:

The base block is changed from Netherrack to Smooth Basalt. This allows for more interesting columns and walls, but this has a few gameplay effects:

  • Floors and ceilings are usually covered with a thick layer of Netherrack. Netherrack blobs also exist underground
  • Gold Ore can be found in both Netherrack and Smooth Basalt, turning into Deepslate Gold Ore in the latter.
  • Quartz Ore can only be found in Netherrack, making
  • Mining for Ancient Debris is much slower since Smooth Basalt is much harder than Netherrack. To compensate, Ancient Debris is more common and has a more interesting distribution.

Highlights

From source data

Game versions

Supports 8 Minecraft versions, the newest being 1.21.11.

Loaders

Runs on Data pack, Fabric, Forge and NeoForge.

Footprint

Rated a light load on a server.

Lavaflow on Nxeon

From our catalogue
One-click install
Supported on Nxeon Minecraft servers. We download it from Modrinth, place it, and restart the server.
Server side
Required on the server
Server type needed
Data pack, Fabric, Forge, NeoForge
Server load
light
Smallest plan we suggest
Minecraft — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
Latest build
0.6.0 (beta), released 2025-12-12

Game versions by loader

LoaderGame versionsNewest
Data pack1.21.5 to 1.21.11 (7 versions)1.21.11
Fabric1.21.6 to 1.21.11 (6 versions)1.21.11
Forge1.21.6 to 1.21.11 (6 versions)1.21.11
NeoForge1.21.6 to 1.21.11 (6 versions)1.21.11

From 5 recorded builds of Lavaflow.

Recent builds

BuildReleasedGame versionsLoaders
0.6.0 beta2025-12-121.21.11Data pack
0.6.0 beta2025-12-121.21.11Fabric, Forge, NeoForge
0.5.4 alpha2025-10-051.21.6 to 1.21.10 (5 versions)Data pack
0.5.4 alpha2025-10-051.21.6 to 1.21.10 (5 versions)Fabric, Forge, NeoForge
0.5.3 alpha2025-06-301.21.5 to 1.21.7 (3 versions)Data pack

Run Lavaflow on a Minecraft server

Pick a server or deploy a new one above; it is installed in one click.

What kind of mod it is

From the catalog
Listed on Modrinth as “Mods”

World generation

Changes or adds to how new terrain, biomes and structures are created.

Runs on your server

From source side support

Modrinth lists Lavaflow as required on the server. Check its Modrinth page to see whether players need it too.

Compatibility

Game
Minecraft
Loaders
Data packFabricForgeNeoForge
Runs on
Serverrequired on the server
Game versions
1.21.11 and 7 earlier

Verified at the source

  • ✓ModrinthOfficial listing, checked 2026-10-02Open ↗
  • ✓Authorjacobsjo, as published on Modrinth
  • ✓LicenseAGPL-3.0-or-laterFree

Lavaflow, answered

Generated from the mod’s own source data.

Do my players need to install Lavaflow?

Modrinth lists Lavaflow as required on the server. Check its Modrinth page to see whether players need it too.

Which loaders does it support?

Data pack, Fabric, Forge and NeoForge.

Is it free?

Yes. Lavaflow is free to download from Modrinth. Its license is AGPL-3.0-or-later.

How do I add it to my Nxeon server?

Use “Add to a server” on this page, or open NxLabs from your dashboard. We install it, restart your server and switch it on.

NxLabs

Run Lavaflow on a Minecraft server.

Deploy in about a minute from $4.99 a month, then add Lavaflow in one click.