Generating End Caves in New and Existing Worlds
Because End Caves Data Pack replaces standard End terrain with Cave World generation, chunks only form as caves when they are generated for the first time while the pack is active.
Enabling on a New World
1. Click the Data Packs button on the Create New World screen.
2. Move the End Caves Data Pack from the Available column to the Selected column.
3. Confirm your selection before creating the world. When you eventually enter an End Portal, the entire dimension will generate with caves from 0 to 128 bounded by a Bedrock floor and roof.
Resetting the End on an Existing World
If you add the pack to a save where you have already visited the End, explored areas remain floating islands while newly loaded chunks abruptly switch to solid cave terrain.
To convert the entire End into caves on an existing singleplayer save:
1. Leave the End and return to the Overworld with any items you want to keep, then save and quit to the title screen.
2. Open your world folder inside the game's saves directory.
3. Verify the data pack is inside that world's datapacks folder, then delete the DIM1 folder to clear old End chunks.
4. Load the world again and step through an End Portal to generate a fresh underground End.