Vitiate went to an unknown part of the galaxy, created a new empire, had three children, renamed himself to Valkorion, and then attacked the known galaxy.
All the protagonists were killed except the Hero of Tython, who was captured. Valkorion's one son, Arcann, betrayed and killed him and became the emperor.
The Hero of Tython escaped imprisonment, became the Outlander, and led a coalition of old and new allies to defeat Arcann with the aid of Valkorion's spirit.