The Xen'Chi are an offshoot of the Chiss race. During the initial Chiss expansion into space, the ancestors of the Xen'Chi took a militaristic approach that was at odds with the rest of Chiss society. Instead of a defensive doctrine, they adopted the ideology that potential threats should be decisively dealt with at the earliest opportunity. They horrified the rest of the Chiss by putting this into practice, and were quickly exiled for it. The exiles wandered for generations in search of a habitable planet to call home before being forced to land on Chil'a'Chin, where they grounded their ships and began to build up their new civilization.