It is somewhat similar to the Heaven Immortal descent of the Heaven Immortal path.
It is just that he has acquired the cultivation method of the Brightness-Deriving Divine Pupils, yet instead of treading the path of the Great Realm Immortal, he has walked the path of the Sword Immortal.
"Being able to see one fading era after another is rather like the History Immortal, except that History Immortals use the Book of History Immortals to record the historical rise and fall of these eras."
Chapter 656