This thought just occurred to me, so I thought I'd suggest it. A corrupted biome.
Picture the scene, if you will. A dark colored island in a state of perpetual darkness due to the shroud of dark mist surrounding it. Teeming with hostile corrupted creatures. Maybe even some mutated horrors. Throw in some dark, maybe corrupted flora and perhaps a dark stone-variant, and you've got yourself a party.
A deadly party, but still a party.