In the House of the Worm by George R.R. Martin

This novella is a fine example of dark fantasy. The imagery is rich and weird and disturbing. It's a mix of horror and adventure that's claustrophobic, atmospheric, and gross. The terror of being lost in darkness, inside an underground maze, with hundreds of hungry slimy creatures swarming all around is perfectly invoked.

Imagine H.R. Giger building the world for and illustrating a tabletop role-playing game source book.

Read this book!