Introduction : Six thousand years ago, the Demon King Feng Xiu and seventy-two Demon Pillars descended from the sky. All creatures that were contaminated by the aura of the Demon Pillars would immediately mutate into demon creatures, and humans would enter a dark age. Afterwards, the powerful humans organized six holy temples on their own to block the demons' progress, and gradually a situation of coexistence between humans and demons was formed.