Eleven Hells

From the introduction:

Often confused with Evermaw (the divine realm of the gods of undeath) and the Yawning Void (a nightmare realm beyond mortal understanding), the Eleven Hells are the homes of demons, devils, and fiends of all kinds, and most are at least theoretically survivable by living visitors. They are ruled by dark forces inimical to those of good and light. While some might seem relatively benign on the surface, all contain horrors, and all