Drevveka Hoctu was formerly a celebrated Human Jedi Knight of the Galactic Republic (female), but she was overtaken by the dark side of the Force quite a few years prior to the Battle of Naboo. She roamed through the galaxy, ultimately arriving on Thule, where she rose to the position of headmaster at the Sith Arts Academy.
Her students were terrified of her, as she lived up to her cruel master reputation, and it was known that she would make her students go into Thule's deserts for long, harsh training periods, compelling them to depend on the dark side for power.
Even with her skills and reputation, Hoctu never achieved a rank greater than headmaster. Because of this, she promised herself that she would one day avenge this insult against those that were above her.