"the Demon Lord Deskari, is ready to finish what was started, and now moves to swallow all of northern Avistan into his home realm—unless he can be stopped"
Demon Lord who takes over a small area of the game world, while preparing to swallow up a larger area into his (her) home realm, unless stopped by the heroes...
I know I've seen that before, a long time ago. Good ideas never really go away, I guess.