Treis is a member of the Imperial Knights under command of Emperor Roan Fel. Treis grew up training alongside the Emperor and has even trained many of the Imperial Knights today in lightsaber combat. He worked closely with the Mon Calamari Rangers after the poisoning of Dac's oceans to protect them from the One Sith forces hunting them. He was recalled, however, back to Bastion and played key parts in both land and space battles against Sith forces near the end of the war.