A Zeltron general was a member of the Black Knights under the command of the Sith Lord known as the Dark Underlord; he faced Mandalorian mercenaries who intruded upon the Underlord's fortress on Malrev IV. The Jedi Master Murrtaggh had cut a deal with them to stage a diversionary attack on the Underlord's forces, and while the battle raged on, Murrtaggh assassinated the Sith Lord but died in the process.
Behind the scenes
Until the release of Evil Never Dies: The Sith Dynasties, this character was frequently identified by fans as the Dark Underlord himself.
Sources
"The History of the Mandalorians: Exploring the Evolution of a Mighty Race of Warriors" — Star Wars Insider 80 (First pictured)- Evil Never Dies: The Sith Dynasties on Hyperspace (backup link) (original site is defunct)
