Sometime following the Third Shinobi World War, Ryun returned to Goddessdrop Mountain in the land, where his master's academy was left vacated. Over the years, Ryun gathered a significant following and gained the support of the daimyō — creating a fledgling Yamagakure around his master's old academy in the hopes of uniting the Land of Mountains under a single hidden village, as had been done in other nations. Ryun then declared war on the clans that refused to join him, aiming to beat them into submission or eradicate them entirely to prevent them from being a threat to the growing village and nation.