In The Last Guardian Book, the raid to Karazhan dicovers a reflection of the tower of Karazhan. These dungeon was exactly equal to the lonely tower.
Karazhan = Nahzarak
Library = Demon dogs' lair (Felhounds?= Probably) Guest Chambers = Summon Chambers Dining room = Room with shackles
These future dungeon coulg give a new place for Teron Gorefiend.
Note of the autor: I'll explain t later, probably I'll make one post for all my own speculation ;), but I don't know if it's allowed...
- See also: Karazhan