Abyss

Description
The Abyss is a plane in the Outer Sphere dedicated to the rule of evil unfettered by law. It is accessible through huge rents in the Maelstrom, opening into fiendish depths, vast beyond imagining. The Abyss is possessed of many layers, strung together by the River Styx. Its inhabitants are demons, its rulers demon lords, who wrested control of the plane eons ago from the primordial qlippoth.