Legend has it that a fairy island appeared in the depths of the sea, and legend has it that the so-called fairy island is a monster that inhabits the deep sea. Emperor Rock once pierced Changhong with a spear, nailing the whirlpool that ravaged the sea to the center of the deep sea. The world and demons alike marveled at the power of the Rock Emperor's Treasure Lance to penetrate the rainbow sunset, and this spear was later called the lance of the rainbow.