About Face and the demons of Tartaros So one of the goals of Tartaros was


   that they would activate Face, which would then wipe out magic all together from the world. Or at least from the continent, which would be quite helpful for them as they don't use magic, but rather curses.


However, it is clearly stated that the strongest members of Tartaros


   are all demons created by the dark mage Zeref himself. Even if they don't use magic, they are just Zeref's living magic.


Doesn't that make them vulnerable to Face? Wouldn't it kill them?
Actually even if the demons are created by Zeref's magic, they will not die as they are not magic objects but actual living beings. He created these living beings using his Living Magic (Seikatsu Mahou), thus breathing life into them which means they no longer need his magic to continue living. Thus, when all magic will disappear, they will continue to live and their curses won't be affected.