Asajj Ventress was a female Rattataki Dark Jedi and arguably the most dangerous of Count Dooku's Dark Acolytes. However, Ventress was initially trained as a Jedi Padawan, while being an orphan on her homeworld of Rattatak, under the tutelage of Jedi Knight Ky Narec. However, after Narec was slain, Ventress gave in to 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.
Becoming a Jedi[]
When Ventress was a child, her parents were killed in a battle in 50 BBY, while her young sister fled from the planet, leaving Ventress alone, without someone to look after her. This was the situation when she was found by a Jedi Knight by the name of Ky Narec. He sensed that she was Force-sensitive to the Force and, although Narec was cut off from the rest of the Jedi Order, he decided to train Ventress as his Padawan.
The Jedi Master and Padawan duo became heroes to Rattataki, ending wars and uniting rival armies. Unfortunately for Asajj, the warlords managed to kill Narec, and the pain of his loss combined with Ventress's own undisciplined skills sent her spiraling down the path toward the dark side of the Force. When Narec died in 22 BBY, she was corrupted to the dark side.
Becoming an apprentice[]
When Count Dooku traveled to Rattatak, he was met by a humanoid co-conspirator. He guided him to watch Asajj Ventress fight in a gladiatorial pit against Blorga, Granda Dolma, Nilo, L8-L9, Flalios, Jasper McKnives, Krutch, Anchor Blue, Swyy'm-Ee and finally Giant Flog. Dooku applauded Ventress's talents, and presented her to Darth Sidious, who approved his choice, and ordered her to kill a certain Jedi—Anakin Skywalker. Asajj Ventress accepted the Sith Lord's offer, and became Count Dooku's Dark Jedi apprentice.
Facing Skywalker on Yavin IV[]
Four standard months after the Battle of Geonosis, Ventress traveled to Muunilinst, which was under siege at the time to carry out her first command: kill Anakin Skywalker. Flying her Fanblade starfighter, Ventress attacked Skywalker over Muunilinst and then lured him to the jungle moon of Yavin 4. The duel ended when Anakin gave in to his anger, hurt Ventress's left hand to grab one of her lightsabers after being disarmed and knocked her from the pinnacle of the temple. Skywalker escaped in Ventress's fighter, leaving Ventress wounded but alive on the planet.
After Ventress awoke from her fall, she swore vengeance against Anakin Skywalker and his master, Ben Kenobi who was the center of Ventress's troubles, but she could not find any solution on how to dismiss it. Fortunately for her, a small Separatist ship landed on the moon and managed to rescue the wounded Dark Jedi from the ground.
Redemption and death[]
Throughout their battles, Kenobi had learned more and more of Ventress's past. He concluded that Ventress was misled, not evil, and took it upon himself to find her and bring her back to the light.
When Republic forces attacked Boz Pity, Kenobi came across the chamber in which Ventress was contained within a Separatist facility, and was subsequently attacked by her when she detected him in her trance. She fought against both Kenobi and Skywalker, only to be unexpectedly abandoned by Dooku, who did not want her to delay his escape with an exhausted and malfunctioned Grievous. He ordered an IG-100 MagnaGuard to kill her as she desperately tried to reach Dooku's shuttle. Using a blaster rifle, the droid shot Ventress down as she approached the shuttle.
Ventress was badly wounded in agony. She tried to get up, but she was too weak to move until Obi-Wan Kenobi knelt down and used his knowledge to help her. Nearly close to death, she saw the ghosts of Ky Narec and other people who Ventress killed during her dark path as a Dark Jedi. Tears came down her face, and she finally let go of her anger and rage, turning her back to the light side. Ventress told Kenobi to protect the Galactic Core from Dooku. Nearly close to death, she thanked him for all the help, and gave him a kiss on the cheek. This made Obi-Wan mourn the death of Ventress. He carried her corpse to the medical shuttle, and flow to Rattatak where he buried her.