Also referred to as the Great Demon. A powerful dragon entity that has been slumbering and is a grave threat to the Celestial Mystery Sect. The late sect founder died attempting to bind it with a contract. It recently awakened, and its sword strike nearly split the sect's mountain gates. The sect's millennium plan involves using a girl with the Heavenly Yin Body to approach the Scarlet Flame Flowers guarding the Sin Dragon and weaken it through the Nine Yin Profound Fiend Formation.
