The seventh layer of Hell in the Dungeons and Dragons mythology. It is ruled by Baalzebul Lord of the Flies, who is obscessed with perfection. As such, it is covered with the remains of half-constructed buildings, because Baalzebul always comes up with a more perfect structure to build and stops work on whatever came before.
Player: So, if we went there, we could find gems and vases and expensive artwork and treasure 'n shit all over Malodominic?
Me: Sure, but devils are constantly salvaging and cannibalizing the old stuff for the new.
Player: So they'd be grabbin' shit too?
Player: No problem, I'll kick their asses.
Me: ...I'm going to enjoy killing your character, you know that?