Heaven's Tribulation:

On the Tianchu Continent, there is a legend: when the sun rises and stops moving, rivers flow backward and waterfalls run upward, and all things reverse, light and darkness will intertwine and collide. The world will shatter, heavenly fire will descend, and the sun's rays will become a light of destruction that brings the world to an end. Everything will return to its origin. This happens once every thousand eras, and no one can explain why. They only know that all life will be wiped out, and all vitality will vanish. People call it the Tribulation of Heaven.