Star Wars: The Clone Wars (2008)

S3E12 Nightsisters

Concerned about Asajj Ventress' increasing mastery of the dark side, Darth Sidious instructs Count Dooku to eliminate her. However, Ventress survives Dooku's attempt on her life and vows revenge. She turns to her fellow kinswomen, the mystical Nightsisters, to help execute her plan. Under the guidance of Mother Talzin, the Nightsisters cloak Asajj and her assassins in invisibility, allowing them to sneak into Dooku's palace on Serenno. While they fail to kill him, their use of stolen Jedi lightsabers makes Dooku believe the Jedi are behind the attack, prompting him to seek a new apprentice from Mother Talzin for his protection.