Each dungeon has 30 monsters, I think. After that, a 'King' monster shows up. I was working on a dungeon map where you walk around and enemy encounters would happen randomly, but I ran out of time and trashed it. I just put the whole dungeon in one encounter. It sounds like the rock enemy was a bug of some kind. I definitely will look at it later to try and recreate the problem. Thanks for playing it and giving me feedback!