Kallumite

The Star Wars wiki of fan invention.

The Kallumites (more frequently called the "Masters") were a mysterious sentient race native to the hostile planet Lum. Assumed to be the original inhabitants of the planet, they were extremely scientifically advanced, as demonstrated by the fact that they managed to eke out a sizeable empire on a planet where life should have been impossible, and managed to import and genetically modify a number of extraplanetary species, including humans (who were turned into the Baquinians), caprids (quiluks), and simians (jaberiks). They also showed a certain skill at organzing these imported species in a way that preserved their own dominance - the quiluks, having been adapted to inhale carbon monoxide and exhale oxygen, were used to provide air for the Baquinians, while the Baquinians provided labor, and the jaberiks proved sufficient at keeping the Baquinians under control through brute force.

Little else was known about the Kallumites, as they were brutally exterminated when the Baquinians revolted against them. Though much of their technology was preserved, almost every depiction of them, be it in portraiture or sculpture, was destroyed during the uprising. Few Baquinians even remembered what the Masters looked like - some legends said the Masters were giants, while other legends said they were actually quite small. Some legends even said they were just highly-intelligent jaberiks.

Whatever they were like, the Baquinians deeply feared their return, and devoted some effort to trying to determine whether or not the Masters had any colonies on other planets.