Board Thread:News and Announcements/@comment-3030647-20160926104712/@comment-3030647-20160927020954

If it's a Magic not wielded by Etherious, then it's fine. Etherious, however, cannot wield any Magic besides Devil Slayer and can only interfere in other people's use of Magic. Therefore, if the Guild constitutes of Etherious, I'm going to have to say no.

Likewise, there is no use of END. END is explicitly Etherious Natsu Dragneel. Doing anything else would be breaking canon. Unfortunately, I cannot allow that either.