Shira Elan Colla Brie, is a Force-sensitive Human female. Born on Imperial Center during the height of Galactic Emperor Palpatine's reign over the majority of the galaxy, Brie dedicated herself to the tenets of the Imperial New Order doctrine. This garnered the interest of Palpatine's chief enforcer, the Sith Lord Darth Vader, who sped the young woman's advancement in various Imperial-sponsored programs, including her enrollment into the Intelligence Academy of Carida. After she graduated with top honors and was promoted to the rank of major by Vader himself, Brie was given a highly classified mission to infiltrate the Rebel Alliance and either cause the death or ostracism of the Rebels. Brie achieved the latter, but the events also left her horribly disfigured and near death. She was recovered by Darth Vader, who rehabilitated her with cybernetic replacements much like his own. Brie then began to train in the dark side of the Force at the feet of Vader under the assumed identity of Lumiya.
While Lumiya studied in secret as Lord Vader's Shadow Hand, she also served as one of the Emperor's Hands—Force-trained assassins who answered to Palpatine himself. She embarked on a pilgrimage to the world of Ziost, during which she crafted her own lightwhip. While on that sojourn, however, both Palpatine and Darth Vader perished in battle at Endor, and as the foremost of their pupils despite her incomplete training, she defaulted to Mistress and lent support to the extra-galactic Nagai species' war against their mortal Tof enemies. The suffered a critical defeat early in her campaign, the damage from which required replacement of her armor, and saw the debut of a triangular headdress that, along with her lightwhip, which will henceforth become her trademark in the future.