The Lamp Lore.

The Demon King is defeated by the Holy Mother and exiled from the universe. The Holy Mother retreats to refine her magical lamp. The Demon King later sends his minions to destroy the Holy Mother's predecessor, the Fairy Queen. The Fairy Queen falls in love with Yan-chang and gives up her immortality. The Demon King traps her, but her son, Chen-hsiang, uses an enchanted axe to rescue her from under a mountain.