Bacterium

Players start by crafting a Must and placing it with some water so a bacteria colony can grow. Once enough compressed material is gathered, a colony can be made to replace the surrounding world, either converting blocks it touches or taking over the blocks placed on top of it. Placing a block above a colony changes what the colony targets, and removing a block from above stops its spread.

Genetically engineered bacteria can eat parts of the world, break bedrock and duplicate diamonds, and turn sand deserts into grass. The mod recreates the long lost Bacteria Mod by TeNNoX, and a Jammer case is crafted to protect against colonies. A Bacterium Limits datapack can be used to add basic restrictions to how the bacteria behave. The server and every player need the mod installed. Files are published for Fabric only, for game versions 1.19.4 and 1.20.1, with 1.7.0 for 1.20.1 as the latest file, released under the GNU General Public License v3.0 only. The source code is public.