Mustag Olus was a warlord who operated in the Outer Rim Territories of the galaxy. After the conclusion of the Stark Hyperspace War, the Dark Lord of the Sith Darth Sidious pushed Olus to construct an army of battle droids and rise up against the Galactic Republic in the Kol Huro system. Palpatine hoped to both test and further weaken the strength of both the Republic and the Jedi Order. In what became known as the Kol Huro Unrest, the absence of a centralized Republic military forced the intervention of the Jedi in order to destroy Olus's growing army, which they succeeded in doing.
- Rogue Planet (First mentioned) (Indirect mention only)
- The New Essential Chronology (Indirect mention only)
- The Essential Atlas (First identified as Mustag Olus)
- The Essential Guide to Warfare