Kol'bui Lardt was a female Imzig Jedi Knight and a member of the Crusaders. Though raised and trained by Karr Shadeez, who knighted her, she was among the Crusaders who sided with Argus Z'dar during his takeover of the organization. She was close with fellow Crusader Manaela Wepwoigho, and her staunch support of Z'dar was among the foremost reasons Manaela joined him too.
In 1,386 BBY, Kol'bui joined Z'dar and several others in an attack on a Zygerrian Slave Empire ship raiding Carosi IV, where they were surprised to encounter three Jedi already involved. Believing Narasi Rican was a slaver, Kol'bui attacked her, but Tirien Kal-Di hit her with a Force push so powerful he not only knocked her out against a bulkhead, but cracked her shoulder and gave her a concussion.
Two years later, Z'dar sent Kol'bui to Bogg 14 to hunt down Qerriz, a defector from the Breld Syndicate. She succeeded in killing a member of the Jedi Order also looking for Qerriz, but wound up dueling Kal-Di. This time, she was unable to escape, and when he cut her hamstring, she fell off a building, hit her chin on an awning, and snapped her neck. In the attempt to escape, however, she signaled the Crusader to report her failure and advise a strike, leading to the destruction of Bogg 14.
Manaela took news of Kol'bui's death particularly hard, and Kal-Di, recognizing both her talent and lack of repentance, considered it a "stupid, useless waste".