In this world, practice is not only a realm, but also a state of mind. It comes from the demon sect. When it comes to the world, what will happen. The sun and moon shine together, and heaven and earth reappear. There is no light or darkness. Day and night alternate, and everything is destroyed. There is no day when the sky is bright and the earth is dark. Only by crossing the world, everything recovers, and the sun, moon and stars reappear in the sky. There are light and darkness, and good and evil share the same origin.