'Now that I think about it, I really don't know anything about the Primordial Ascension. I've accepted everything because I became stronger much faster than others, but I never questioned anything…' Dilan realized after a short chat with Ariel Silvertale.
He got to know many pieces of important information, including the fact that there would only be one Divine occupation for every Primordial Ascension that happened.
Apparently, the Primordial Ascensions didn't happen often and they were initiated by a being that wanted to spread mana through the entire universe.
It would use the Primordial Ascension to awaken the mana of a specific planet and once the planet would be fully awoken, its overflowing mana would spread out to awaken other planets.