Battle of the Spirit Realm

The lifeline of the Yuan Kingdom is controlled by the four major families, and the ambitions behind them are constantly expanding, and the overt and covert struggles are irreconcilable. Foreign races on the border are slowly rising again, and a war is just around the corner. How did the former emperors overcome internal and external troubles? How will a fantasy journey of four teenagers change the trajectory of the Yuan Kingdom? The gears of fate begin to turn, and everything is moving in an unknown direction!