Thank you Hinoto-no-Ryuji and Belhi for commenting. this helps a lot.

The idea of the darkness in souls got lost in writing since I didn't add a section into it about how this is used. Let us say there's someone that hates the world and wants it destroyed without faltering on that desire. Zodiark is darkness and has found a way to create his own servants to do his bidding, and I'm talking way back before the 1st era and before he was sealed as the moon since the era's are the key to bringing Zodiark back. He takes this soul and creates what we know as Ascians from that, with conditions of forgetting your past, come join me, that kind of thing. With this first soul he would create Elidibus who would have this same power to create more Ascians.