It looks somewhat like a Heaven Immortal's Heaven Immortal Descent.
Except that he had obtained the cultivation method for the Radiant God-Eye, yet rather than following the path of the Great World Immortal, he took the path of the Sword Immortal.
"Being able to witness one ending era after another... it almost resembles a History Immortal, though History Immortals use the Books of History to record the rise and fall of these eras."
Chapter 656