Slabbed

Slabs are placed along cave floors, ravines and mineshafts so that a climb becomes a single block high step instead of a full wall. Long staircase-like sections get slabs on the other step, which keeps underground passages from looking cluttered or unnatural. Stair-like cave passages are detected first, which determines where slabs get placed, and the chosen stone follows the local rock: Stone, Deepslate, Tuff, Andesite, Diorite or Granite, with an occasional rarer variant to avoid a uniform look.

Only bottom slabs are placed, so mobs still spawn normally and lighting is unaffected. Work is limited to a fixed number of slabs per chunk, and block updates are kept to a minimum so that generating new terrain stays quick. Slabbed also supports modded stone types and aims to add deeper cave biome support such as Ancient City, though that is not complete. The mod runs on the server and requires Fabric API. Files exist for Fabric in two game versions, 26.1 and 26.1.1, with 0.0.1 for 26.1.1 as the latest build. The code is open source under the MIT License.

The project is in an early testing and alpha stage, and its behavior may change substantially. Bugs, unfinished features and frequent updates should be expected, and the author does not recommend it for survival worlds yet. A config file that controls how often slabs appear and which materials are preferred, along with correct ordering of the cave generation step, is planned for a later release and is not included yet.