Back then, due to the split within the Beidou Immortal Palace, Han Yi was invited to the Daluo Fairy Court to attend the Douxian Meeting between Beidou and Gouchen. At that time, he was still a Half-immortal, and before the Douxian Meeting even began, he encountered the mutation of the Emperor Cliff Heaven Realm.
After that, he and other True Immortals from the Beidou Immortal Palace went to the Emperor Cliff Heaven Realm, where they encountered strange cultivators. From the words of Taiyuan, Han Yi learned that these strange cultivators were affected by the pollution of the Inverse Tao Aura.
The origin of all this was the Tao Contrarian, a terrifying existence that wandered through Chaos, reversing the Tao Principles and destroying great worlds.
Not long ago, the split in Daluo was precisely because it had entangled with this terrifying existence, and even the Void Ancient Tao Ancestor, who had existed for countless tens of thousands of years, perished in it.