According to legend, there was an evil spirit in the ancient land that was domineering in the world. The evil spirit was called the King of Chaos. He was addicted to humans and caused disasters wherever he went. For a hundred years, the entire ancient land was shrouded in the haze of the King of Chaos. In later generations, people with divine power from the northern and southern tribes rose up to fight against the King of Chaos and led him to the sea of quartz in the ancient land. The gravity of this sea is abnormal, and an eye of the sea is formed every 10 years. The gravitational force is the strongest and can control everything. Attracted in, the two men of divine power sealed the Chaos King into the eye of the quartz sea at the expense of almost all the clan members. When the sea eye was closed, they sacrificed the power of two seals, one named Emerald, and the other One is said to be amber, and the two surviving tribes each hold one. They agree that when the Eye of the Sea of Quartz opens every 10 years, they will come here to use the combined power of the two to recast the seal to prevent the King of Chaos from breaking out and reappearing in the world.