Are you seriously trusting what the written history in this universe says? We know how the magic user were persecuted in the past as told by Flora and Schierke, and they also said long in the past the practice of magic was widespread before the Holy See begun the witch hunt. And the same magic user coincidentally represent a big threat for the God Hand's schemes. You don't still get what i'm getting to? Here's a hint:There are chronicles of those events (the fall of the city, the conquer of Gaiseric) and no mention of anything like the merge occurring right now in the berserk world or a divide of the planes