Biome Builder

Biome Builder

Build actual minecraft biomes, block by block, wherever you want.

by
14 Downloads
fabricgame-mechanicsworldgen
Rent Server with this Mod

Screenshots

Mod Banner
Biome Anchor Recipe
Advanced Biome Anchor Recipe
Master Biome Anchor Recipe
Structure Anchor Recipe
Advanced Structure Anchor Recipe

About this Mod

Biome Builder Mod Banner

Biome Builder gives the player the ability to create Minecraft's biomes and structures, wherever they want.

Insipired by Terraria's mechanic of "placing down a number of specific blocks turns the area into a particular biome/structure", the mod adds two types of new blocks: Biome Anchors and Structure Anchors.

-Biome Anchors-

Biome Anchor Blocks

Step One

To build a biome using the Biome Anchor, simply interact with the biome anchor and select a biome of your choice.

Biome Category Selection Screen

Biome Selection Screen

Step Two

Then, fill in the requirements by placing required blocks within the biome anchor's range:

  • Vertical Range: 12 blocks above and below the anchor. (Configurable!)
  • Horizontal Range: The chunk the biome anchor is placed in, visible by pressing F3 + G.

Biome Requirements Screen

Biome Requirements Fulfilled

Step Three

Upon fulfilling the requirements, hit build to convert that chunk into the selected biome.

Converted Biome Confirmation

Be watchful of the requirements: Some biomes require a minimum/maximum elevation!

-Structure Anchors-

Structure Anchor Blocks

Structure Anchors function similarly to biome anchors, but they have an additional requirement:

Structure Anchors also require Adjacent Biomes

At least 3 directly adjacent chunks (North/East/South/West) must be a biome that the structure requires. If there are more than 2 biomes within a single chunk, it will only detect the biome of the center block (8, X, 8).

An Activated Structure Anchor causes the chunk and 24 blocks above & below it to count as a particular minecraft structure (Vertical Range is Configurable!). Example: Ocean Monuments- the area will spawn Guardians, Nether Fortresses spawn Blazes and Wither Skeletons, etc.

-IMPORTANT RULES-

  • This mod is made with skyblock in mind, but can be used in any world. In the mod is a built-in function for worlds to generate with only one biome, plains (off by default). It is up to the player to find ways to build and restore biomes to their world. (Configurable!)

  • Biome and Structure Anchors cannot be within the range of another.

  • Certain biomes and structures can become avalible by crafting higher tier anchors. (Configurable!)

Configuration

Bug Reporting

Feel free to leave any bug reports or suggestions on the discord.

Available Versions

Biome Builder 1.0.0release
MC 1.21.1fabric
June 19, 2026

How to Install Biome Builder on Your Server

1

Order Server

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

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).

3

Install Mod

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

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.1

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Biome Builder server crashes on startup – what to do?

Most common cause: wrong fabric 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 (1.21.1). You can switch loaders with one click in the panel.

Is Biome Builder compatible with fabric?

Biome Builder officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Biome Builder – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Biome Builder 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 Biome Builder with just one click on your server.

Recommended RAM
6 GBfrom €12/mo
Minimum 4 GB | per 5 players
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NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.1