What Zhu Di guarded at the national frontier was a power beyond the laws of nature.
After securing the frontier, he had people create thirteen treasures and a sword named Zhenyue.
By the end of the Ming dynasty, Zhu Youjian did not commit suicide, but fled south with the thirteen treasures.
After Li Zicheng attacked the city, Zhenyue was destroyed and split into two short blades.
With the thirteen treasures and Zhenyue lost, that power of nature was released from its seal, no longer constrained, and descended upon the mortal world to wreak havoc as it pleased.
The protagonists each possess different abilities and join forces to save the world.
