From ROI Wiki

The Ahbranai are the ancient ancestors of the Yigzan and are known within the galaxy as "The Star Builders" because of their incredibly advanced technology that gives them the ability to literally build stars, planets, and the like. They are the most advanced race in the galaxy by far, but are also, in general, with few exceptions (such as Psial and Yazik) are prideful, cruel, malevolent and controlling. They see themselves as gods and act accordingly, enslaving all other races under their control via the Commonwealth, the political arm of the Ahbranai created with the express purpose of controlling all the other races and making them enslave themselves willingly.