User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-196.22.252.102-20180508125739/@comment-196.22.252.102-20180508140304

Perhaps they will use the same method used to create the artificial devils on Vali. It is farfetched but it is the only logical and realistic path Vali has at gaining power of Dragon God class and compete against Issei in his dragon form