Tha’ci was a female Human Jedi Shadow and Traveller who lived both during the New Sith Wars and the early rise of the Galactic Empire. During the time of the New Sith Wars, she led a group of outcast Jedi Shadows who fought the Sith and other Dark Side users. During a battle against Sith Lord Darth Bane on Dantooine, she was killed along with several of her fellow Shadows. She managed to place her spirit within a crystal, however. This kept her hidden and safe from Bane, but also trapped inside the crystal. Nearly a thousand years later, the fugitive Jedi Knight Vhiran Ashukahwa found the crystal and released Tha’ci from it. Following this, Tha’ci joined Ashukahwa on his journeys and his attempts to fight the recently risen Galactic Empire.