I am making a huge cave area for my friend's RPG. So far, it's made of 64x64 baseplates at the bottom, gradually getting higher (I don't know why), 64x64 cubes on the sides (also, other stuff will be built on top), and a ceiling. Inside, it has small three tunnels, one secret passage to a volcanic area, some shallow water, many rocks, slime, crystals, an area where people tried to build in the cave and got killed by some of the giant bugs that lived there. This area has a few buried cones, part of a support for a building, and some bones.
What do you think I should add, to make the cave more interesting?
