Seran, a Human woman, served as the apprentice to the Sith LordKhreusis in the era known as the Cold War. This female apprentice witnessed the encounter between her master and Kallig, who was attempting to obtain Khreusis' mask.
Behind the scenes
Seran's character is featured in Star Wars: The Old Republic as part of the Sith Inquisitor storyline, specifically on the planet of Korriban.