In the belly of the monster.

Here are some of the background concepts for my... thing. The main setting is going to be inside the monsters belly. Its going to be a place kind of like The Never Ending Story or L.O.T.R.. So the first setting, visited briefly, is the monsters mouth. Its gonna be all dark and wet since monsters come out at night and mouths are wet... Its gonna be much bigger than you think.
Here is a concept of one of the places in the monsters belly. Most of whats in the monsters belly is a wasteland but a few hundred thousand of the monster's victims found a place to take shelter. This is the lost city of Lemuria. Many of its inhabitants don't know anything outside of the belly as they were born in the city. Its always dark but the ceiling is lined with something that looks like stars so there is some residual light. There is also weather inside the belly as well as snow capped mountains.