The Underworld

The Underworld is Hades' realm and base of operations.

Description
As in Greek myth, the Underworld is the land of the dead, containing at least Tartarus and the River Styx, and it is very difficult for the living to enter or leave, even members of the pantheon. It is a shadowy, dark place full of Daemons and ghosts.

Hades conducts most of his operations from the throne room of his palace.