Fiction:The Firmament/Betrayer's Rise

Betrayer's Rise is the realm of the demon lord Vealdimar in the dread-plane of Irkalla.

Description
Betrayer's Rise takes the form of an immense plateau with a great structure, the Fortress of Dread, at its center. The area around the building is battered and burned with hellfire, with rivers of magma flowing across the landscape. A number of enchanted walls protect each portion of the plateau; their magics disallow any from simply teleporting or flying over them, and they can only be passed by those considered particularly treacherous.

Inhabitants
This region is among the largest populated centers of Irkalla, where great numbers of demons congregate to do business and practice heinous acts in order to gain the privilege of delving deeper into the realm. Only those favored by Vealdimar as the most cruel and dishonest are allowed within the Fortress of Dread, where they serve as his champions.