Vukub Ysin'zhu, the Ogre Baron, was the head of Dun Fortress. He reportedly came into power by slaying the previous baron, a Tsol'teth master whose protege, Zh'risia, set in motion the events of the Dun Valley Saga. In 642 AF, Ysin'zhu was in turn slain by Kallion of the Aalen, a Tsol'aa with his own aspirations for the barony.