A Rylan by birth, Xur is a tyrant who wishes to one day rule over all Rylos.
Even at a young age Xur did not approve of the Star League, considering it a refuge for, as he called them weak species. He quickly became thirsty for power and created many cults to build up an army of followers. His groups were eventually discovered and stopped by his father.
Xur later sought refuge with the Kodan. After many talks with the Kodan Emperor, the pair join forces. The emperor places Xur in command of the Kodan Armada. Xur was more than ready to wage war against the Star League, which included his home planet Rylos. He intended to become the first "Emperor of Rylos".