Round 1: Vitiate's throne room, where he is confronted by Darth Caedus instead of the Hero of Tython. Caedus challenges Vitiate for the title of Sith Emperor. Vitiate may not use Essence Transfer to seize Caedus' body if he dies.
Round 2: Where Caedus fought Jaina. He is confronted by Vitiate instead of Jaina, who vows to destroy him.