Xi'an Houses Chii, Ru'a, Kl.ō, and Uai'i
Xi'an homeworld RyiX'yan (Hyoton III) rendered uninhabitable; first Imperial House established, Xi'an Civil Service established
The Great Divide (the Xi’an Civil War) took place from 20044 to 19755 BCE. The outcome of millennia of inter-House conflicts and complex webs of enmity and allyship, it began when the last daughter of House Kl.ō attempted defection to House Uai’i. Hostilities between the Houses grew deadly, and Houses Chii and Ru’a were compelled to join a now system-wide civil war. The war concluded when members of House Kl.ō inadvertently destroyed the atmosphere of the Xi’an homeworld, RyiX’yan (Hyoton III), rendering it uninhabitable and killing millions. The events of the Great Divide forced the Xi’an to reassess their culture. The calendar was reset to I.0 (19747 BCE), the Civil Service was established, and Ru’a was elected to serve as the first Imperial House.