User blog comment:IamJakuhoRaikoben/Chapter 366: 1000 Souls, Review./@comment-98.94.33.235-20140112004700/@comment-7418318-20140114174450

Or Yuka might be able to drive the Demonic magic out of them or Gildarts' magic can seperate them from the Demonic part or there's some ritual to be enacted or Moon Drip might dispell the demonification or... a thousand other possibilities.