A powerful beast that was sealed decades ago. Every few hundred years, it breaks through the seal and descends upon the world, causing what is called a Heavenly Calamity. The previous sect leaders of the Four Great Sects battled it, with two dying in battle and two perishing during sealing. The previous Demon Lord of the Demon Realm also died in the sealing process. The Cultivation World is expected to suffer heavy losses from the next Heavenly Calamity, after which the Demon Realm will invade and destroy it.
