Tronus was a Sith Lord of the male gender, serving the Sith Empire. He was the student of Darth Xarion. In secret, Tronus was also a member of a little-known Sith cult called "The Unmasked". Without Tronus' knowledge, Darth Xarion discovered this secret affiliation, but couldn't act on this information. Xarion feared that doing so would reveal to the other cult members that he knew of their existence.