Vassek, a Chagrianmale, served as the apprentice to the Sith LordKhreusis throughout the Cold War. He witnessed Kallig's arrival and subsequent confrontation with his master, as Kallig aimed to take possession of Khreusis' mask.
Behind the scenes
Vassek's character can be found in Star Wars: The Old Republic, specifically in the Sith Inquisitor storyline, which takes place on the planet of Korriban.