The Great Wilderness

In the early Yuan Dynasty of the Great Wilderness, Nuwa practiced Taoism and ascended to immortality, leaving behind three volumes of heavenly books on immortality, medical classics, and demon subjugation. Before Nuwa ascended to the throne, in order to consolidate the fertile land under her jurisdiction, she asked the Yellow Emperor, Yan Emperor, and Chi You to hold a volume each of immortality, medical classics, and demon subduing, and they would practice them individually.