Yansu Grjak was a member of the Nightsisters of Dathomir during the time of the Clone Wars.
Yansu and two of her Nightsisters
Yansu was a shaman of the Nightsisters who lived during the waning days of the Galactic Republic. She and her fellow sister Sai Sircu led an army of their lightsaber-wielding followers at the beginning of the war between the Republic and the Confederacy of Independent Systems, after abandoning their homeworld, Dathomir due to leadership disputes with the Nightsisters. At that time, they formed an alliance with Count Dooku in order to bring about the downfall of the Jedi Order.
During the conflict, she encountered two Jedi who attempted to fight her. Grjak thus sent her fellow Nightsisters against the Jedi, allowing herself to flee in a Sith Infiltrator ship.
Later she was sent to Rodia, where she was chased down by a pair of Jedi, and despite her powers, she was killed by the pair, weakened by crystals being thrown at her by the Jedi via the Force.
- Star Wars: The Clone Wars: Jedi Alliance: Prima Official Game Guide
- Rogue Leaders: The Story of LucasArts
- "Everything You Always Wanted to Know about the Nightsisters but Were Afraid to Ask" — Star Wars Insider 122
- Book of Sith: Secrets from the Dark Side