Human Exodus

When the humans fled from their world of Oberyn, chased away by the God of Chaos, Nu, or Amaeira, they took a portal into a new world. As they arrived, they found their connection to the magical forces of the universe severed and their memories mostly wiped clean. The humans were like children in a strange new world.
Ancient prophecies had predicted the exodus, and so the Era of Beginning was officially charted.