Peacekeeping immortals living in clans inhabit a mythical mountain range called Zu, which is situated between Heaven and Earth. A demon called Insomnia desires to rule Zu and the world below, so it begins to destroy the various clans. In the Kunlun Mountains, Dawn sends away her apprentice, King Sky, because she believes that their emotional attachment to each other hinders their progress. She gives him her weapon, the Moon Orb, to help him train. He is to return only after he has attained a higher level. If she cannot be found, the Moon Orb will find her. Moments after they part, Insomnia attacks Dawn and disintegrates her.