Tauneraan

A brutal, intelligent and ambitious race who have spread their rule throughout the galaxy. Tauneraan set their sites on planetary dictatorship after seeing their home planet begin to suffer under the quick growth of their societies. Their most powerful resources were diminishing, which forced the Tauneraan to look to take other planets to continue to prosper. They have enslaved numerous  systems, including the Gnossia system.

No one knows much about them or where they came from. Their wars are primarily fought by other species that have allied with them, and Tauneraan's take a backseat to the footwork. It is later revealed in the series that Tauneraan's are in fact human beings.