Who killed Demogorgon, and when? Is there a new Prince of Demons now?
Planescape, Dungeons & Dragons, their logos, Wizards of the Coast, and the Wizards of the Coast logo are ©2008, Wizards of the Coast, a subsidiary of Hasbro Inc. and used with permission.
There's a coalition of different powers: Gwynharwyf, Orcus, Charon, and others who all invade Demogorgon's realm at once at the climax of the Savage Tide adventure path in Dungeon Magazine.
Who the next Prince of Demons is, and how long it takes for Demogorgon to reform, is left up in the air. Planewalker will have to decide whether to run with the plot possibilities or not.