Well, white and black magic as we know it only exist from the Fifth Astral Era. That's not to say that prior to that magic didn't exist at all. Perhaps there was ancient magic that existed, maybe functioned differently, and maybe called different things. It is like different ages rediscover different things, rename them, or repurpose them. I could be completely wrong. it is possible that in the First Astral Era, which we know nothing about, the world was mundane, and then something happened and magic started to be released into the world. In come the Allagans, who seem to be mostly technology based, but who knows if it is pure technology, and not technology infused with magic. Or even the reverse, that the First Age was full of powerful magics, some great cataclysm happened rupturing it and throwing it all out of balance, thus the Allagans turned to technology to make up for the lack of magic, and it was only in the 5th Age that Magic started coming back into the picture. /shrug