User blog comment:B214/Volume 23 discussion blog/@comment-206.224.253.186-20170420231523/@comment-30924344-20170421192820

If you compare Issei to Vali, Issei has the Evil Pieces powers, Ddraig's powers, Ophis' power, Great Red's power, and two of Albion's abilities. Vali just has his Lucifer powers and Albion's powers. Vali no doubt gains immense magic powers in the future as hinted when he showed extreme talent for it, from learning some Norse magic from reading about said spells. He is a natural genius when it comes to magic. I think the the main reason along with him helping the world for creating Mizunoe, is to teach younger generations to be mages, to pass on his talent and help their talent grow.