- caverns in free play and the campaign (mission pieces, fortresses, islands, sealed caves and dwarf caves stay untouched)
- caverns sometimes hold a pool of water or lava, veins in their walls, rarely a small treasure or a creature in chains to free
- rivers keep away from the start; test: open share, liquids and a hero path to the core
- standalone file in play/ rebuilt
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>