Aegis Squadron, a unit of the Sith Empire that utilized walker vehicles, was based on Ziost. In the year 3636 BBY, the one-time Sith Emperor Vitiate arrived on Ziost and seized control of numerous Imperial personnel there, transforming them into instruments of civilian slaughter. The pilots of Aegis Squadron were included among those dominated by Vitiate, and their walkers were deployed to cause widespread devastation near New Adasta.