Skip to content

Reef

Library that extends vanilla worldgen by providing alternatives to unmodifiable features

Fabric
Loaders
Fabric
Downloads on Modrinth
1K
Followers on Modrinth
11
versions
5
Updated
March 29, 2026Mar 29
Published
in 2024
This is a library — other mods need it, and it adds nothing to the game by itself

At a glance

A library: other mods need it
Runs on Fabric
For Minecraft 1.20.5–1.21.1, 1.21.7–1.21.11
Server only — players don't need to install it
Latest version — 0.3.0+1.21.11 from March 29, 2026
Requires Fabric API, Lithostitched and Fabric Language Kotlin
Where it's needed
In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.20.5–1.21.1, 1.21.7–1.21.11

Reef logo

Library that extends vanilla worldgen by providing alternatives to unmodifiable features

What is the goal of the mod?

The main goal of Reef is to take vanilla world gen and make it configurable. The way we want to achieve this is by not changing vanilla, but adding to it. So let's say we want to be able to customize the Ice Spike feature, the way Reef approaches this is by creating a new identical feature that is fully customizable. So there is no need for dirty mixins and breaking compatibility with other mods. This is not possible in all cases of course, and in those cases we will take the least intrusive option.

What Does the mod do?

Reef does a lot of things! Well, only a few for now, but we have great plans. Currently, the mod adds duplicates of vanilla features that can be properly configured. Custom Tags have been added to enable icebergs or eroded badlands generation to occur in biomes. And a Custom StructurePool Projection (See warning section about this.)

Contents

  • Custom Features:

    • Spike ("Ice Spike" Feature, but customizable)
    • Inverted Spike ("Spike" Feature, but is upside down)
    • Monster Room ("Dungeon" Feature, but customizable)
    • Structure Piece (Similar to "Fossil" Feature, but with no forced height offset)
    • Large Cave Pillar ("Large Dripstone", but customizable)
    • Feature List (Places all features in a list)
  • Custom Tags:

    • has_eroded_pillar (Will apply a custom Eroded Badlands Surface Builder, which has been tweaked to use OCEAN_FLOOR_WG)
    • has_vanilla_badlands_pillar (Will apply the vanilla Eroded Badlands Surface Builder. Should only be used to stop vanilla from generating. Will break in water)
    • has_iceberg (Will apply the Iceberg Surface Builder)
  • StructurePool Projections:

    • SEAFLOOR_MATCHING (Adds seafloor matching projection. See warning section about this.)

Future of the lib

While this lib is only in the early stages of development. We already have plans to fully deprecate this mod. Since This is planned to be just one module from our future mod VoidLib.

Why?

Because it is nicer to have a single jar file for all the libs we use, kinda like Fapi or QSL

Then why not just release VoidLib? Because Gradle multi-module projects are hard :(

WARNING

As the mod is currently in very early stages, so there are some kinks we have not fixed. As of the current version (0.1.2) here are the current warning:

StructurePool Projection SEAFLOOR_MATCHING

This projection exists but does not behave anything like expected. Please don't use it for anything, but testing.

Custom Features

All the current features were made quickly and very messily for a world gen mod we were working on. They have not been property cleaned up and optimized. So do expect them to change, both as features and their configs.

Wiki

As of the current update (0.1.2) there is no wiki. This is just a note saying that Ender is working on one. If there isn't one more than a month after the (0.1.2) release, go @ Ender on discord

FAQ

How to install Reef?

Install Fabric for your Minecraft version, download Reef 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 Reef support?

Reef has builds for Minecraft 1.20.5–1.21.1, 1.21.7–1.21.11.

Is Reef needed on the server?

Server only — players don't need to install it

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

The site uses cookies: the necessary ones for sign-in and the theme, plus the Yandex Metrica and LiveInternet visit counters — they show us how the site is used. We have no advertising cookies. More