Nether Realms

The Nether Realms originally made up one of the two Realms of the Biverse. While the Aether Realms were, for all intents and purposes, destroyed, the Nether Realms continued on uninterrupted save for the loss of its most powerful denizen and oppressive ruler. Giving rise to the many races of demons that would someday plague IIo, the Nether Realms are also home to creatures such as doppelgangers.