User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1884090-20150322231439/@comment-1359322-20150323005616

Well the time factor aside, the Emperio is definitely more powerful than the Cardinal. And the only way they can maintain the Emperio and Cardinal longer is through improving their staminas, and probably by learning how to fight while using less energy but can still get the same if not better outcome. Well just my two cents.