Human disaster

In 503, the dark haze that shrouded the whole continent for 16 years dissipated and the Federation was established in 615, the Federation was divided by civil war in 623 of the Shenli calendar, the three major city states, Tianshan, Tianying and Tianhua, were in the assembly of Shendiao valley. Three days later, the Yongding agreement was signed, and the city-state era came this is the first year of the new calendar.