Dominus, who lived until the era of the Great Sith War, was a Jedi Master. A respected and honored member of the Jedi Order, Dominus mentored several apprentices, with Zona Luka of Vultan being his most cherished. Unfortunately, Luka succumbed to the allure of the dark side and allied herself with the Brotherhood of the Sith under the leadership of Dark Lord Exar Kun in 3996 BBY. Shortly thereafter, Kun commanded Luka to murder her previous mentor, leading her to assault Dominus in his own dwelling. Despite his shock at his beloved apprentice's attempt at assassination, Dominus engaged the Vultan in a lightsaber fight. After a brief confrontation, Luka prevailed and fatally wounded Dominus, but the dying Jedi Master summoned the strength to eliminate his former student using the Force.
Born in the years preceding the Great Sith War, Dominus was a male of a species characterized by gray skin. Eventually, his connection to the Force was recognized, and the Jedi Order took him in to undergo training in the ways of the Jedi. Dominus advanced to the rank of Jedi Master, earning considerable respect over time. He guided numerous apprentices, including Zona Luka of Vultan, whom he held in highest regard. After Luka's ascension to Jedi Knighthood, Dominus chose to retire to a modest hut.
In 3996 BBY, Luka, now influenced by the spirits emanating from Dark Lord Exar Kun's Sith holocron, arrived at Dominus' residence. After declaring her allegiance to the Brotherhood of the Sith, Luka challenged Dominus to combat, fulfilling Kun's directive for her and other fallen Knights to assail and slay their former instructors. Dominus, astonished by his favorite student's treachery, ignited his lightsaber and engaged the Vultan in a duel. During their brief skirmish, Luka gained the advantage, inflicting a fatal wound upon Dominus. However, as the Jedi Master lay dying, he summoned the power to eliminate his corrupted apprentice through the Force. Jedi Knights Dace Diath, Shoaneb Culu, and Qrrrl Toq later investigated the scene, expressing surprise that Zona Luka would commit such an act against her former master.
Dominus displayed a degree of favoritism toward Zona Luka, regarding the Vultan as his most beloved student. Consequently, he was utterly shocked when Luka, now under the sway of the dark side, launched an assault upon him in his own home. Nevertheless, Dominus remained steadfast in his commitment to defend the light, even if it meant ending the life of his favorite apprentice.
Dominus made his initial appearance in the fourth issue of Star Wars: Tales of the Jedi – The Sith War, a story arc within the Star Wars: Tales of the Jedi comic book series. Kevin J. Anderson wrote the issue, Dario Carrasco, Jr. provided the illustrations, and it was released on November 1, 1995. Both the Star Wars Encyclopedia and A Guide to the Star Wars Universe, Third Edition, Revised and Expanded included entries for Dominus, but his name was erroneously spelled "Dominis" in both reference works.