Over four hundred and twenty-five thousand lightyears from the Sol-Daiban Galaxy, a minor galaxy makes it's own orbit around the spiral arms. Ym'k'ru was named such by the Ancient Chozo who took rest in the small galaxy as they observed the end events of what is now known as the Forunner-Flood War. While most Chozo tribes continued into the larger parent galaxy, some stayed behind and developed into the Avia-ra, while a great number of other sapient species also reside within the single spiral and its stellar halo.