Asajj Ventress was a female Dathomirian Dark Jedi and a valuable Dark Acolyte to Count Dooku. Originally a Nightsister from Dathomir, Ventress was taken as a slave to Rattatak and trained as a Jedi Padawan by Jedi Knight Ky Narec. However, after Narec was slain, Ventress gave into her anger and began walking the path of the dark side; taking up the lightsaber of her dead master, she trained herself in the Jar'Kai style of lightsaber combat, before slaying all the warlords on Rattatak and installing herself as its ruler. She was the rival of Elara
As a child, Asajj Ventress was likely a very caring, compassionate individual. While during her apprenticeship under Ky Narec, he died which caused her to spiral into darkness. Consumed by grief, Ventress gave into her rage and lust for vengeance. She abandoned Jedi philosophy and pursued power and retribution, becoming a vicious warlord. Taking over Rattatak in a flurry of bloodshed and left with no further enemies to slake her bloodlust, Ventress focused her hatred outward. She came to blame the Jedi obsessively for, from her point of view, abandoning her master.