C207 Four Realms Immortal Realm

Lower and upper realms. The Demonic Demon World was originally one, but was then forcefully split apart by the Lord of the Three Realms, becoming part of the Three Realms. The Three Realms was merely the Mortal Realm, and the Celestial Realm was the fourth realm. There were hundreds of millions of ordinary cultivators in the Immortal World of the Fourth World