Castle Ventress, located on the planet Rattatak, served as the fortified stronghold of Asajj Ventress throughout the Clone Wars. This citadel functioned as both her central command hub and a detention facility for numerous Rattataki. Notably, she stored the lightsabers belonging to her deceased Jedi Master, Ky Narec, who had met his death, within the citadel's interior.
Obi-Wan Kenobi, a Jedi Knight, and Alpha-17, an ARC trooper, found themselves imprisoned within the castle during the Clone Wars. Following the Battle of Jabiim, Ventress subjected them to torture. Ultimately, they achieved escaped, absconding with both Ky Narec's lightsaber and a Ginivex-class starfighters that belonged to Ventress.