Asmyetric Co-op

Each player picks one of four classes when joining, and the choice sets which actions that player can take. Some classes may only break ore blocks such as coal, iron, diamond, gold, lapis and redstone, while another class handles the end portal frame. Other classes receive permanent haste, which speeds up mining of most blocks. Players are automatically assigned a colored team based on their class, which makes roles clear to recognize on a server.

The mod applies penalties as well as abilities. One class cannot deal physical damage to monsters and only applies knockback, and another is limited to a plant-based diet. Everyone starts with a shared basic survival layer of wood, dirt, stone, deepslate and obsidian, while specialized blocks and tools stay restricted to the classes that need them. Upon selecting a class, a guide book explaining that role's abilities is given automatically.

The mod needs Fabric API and is published for Fabric only, with files for Minecraft 1.21.1. It runs on the client and the server, so the server and every player need it. The code is released under All rights reserved, and the mod is not open source.