Dantin Vellos was a male Zabrak who made a living as a mercenary during the final years of the Galactic Republic.
Vellos rose to prominence as the head of a mercenary unit, leading the Rodian Taznak Pajiic, the Herglic Sinbbis, and the Arcona Ajalo Nills. When the Ithorian Herdship known as the Bazaar made its way to the Cularin system, a podrace was organized. Osten Dal'Nay, who was in charge of the Cularin Militia, intended to capitalize on the event to promote the Thaereian military's activities within the system. In response, the Thaereians contracted Vellos and his team to assassinate Dal'Nay. Following the conclusion of the podrace, spectators made their way to the village of Tathin on the planet of Cularin. There, Vellos made contact with Dal'Nay, posing as a potential supporter of the Militia. Dal'Nay agreed to meet with Vellos, who had set up an ambush, directing his mercenaries to hurl thermal detonators and fragmentation grenades at Dal'Nay. Despite the attack, the Human Dal'Nay survived and escaped into the Cularin jungle. Vellos gave chase, and he and his mercenaries assaulted a couple of Ithorian botanists they encountered along the way. Ultimately, the mercenaries cornered Dal'Nay at a shallow stream and engaged him in melee combat, fearing that the sound of blaster fire would attract unwanted attention. However, the heroes of Cularin unexpectedly intervened, defeating Vellos and his mercenary band.