User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140108062741/@comment-23853100-20140108085413

Well we shouldn't forget that DxD uses it's own original mythology system.

As to the power-up thing, yeah aside from Vali, Saji, Tsubaki and the ORC, it's quite hard on the others.