Kayla Lorrel was a noble Jedi Knight and quite the pride and joy of her master. Her one and only flaw, however, was the love she had for her master's other apprentice, Jaren Lok. The two carried out a relationship in secret for several years. It was not until a group of mercenaries killed Lok that their master had figured out what was going on behind his back. He tried to save Kayla from herself, but she was grief stricken and exacted vengeance as she saw fit. When her master attempted to stop her, she killed him.
She was exiled from the Jedi and she fled, nurturing her hate and anger towards the council. The Dark Jedi Master Xal Shun, at this time, was emperor of the Isen Star Empire. His daughter, Arrianah Shun, approached Kayla with a proposition. Together they overthrew the emperor and killed him. Arrianah became Empress and Kayla became her second in command. The Jedi finally put a stop to the Shun legacy and the ISE crumbled soon after.
Kayla fled and was found by Lord Kamulos who sought her out and recruited her for his order. She was a fierce warrior; one he beleived would cut down any that stood in his way; but during the Battle of Taylon Azriel was killed by Guan Blackthorne.