User blog comment:FairyRaven/Fairy Tail Chapter 448: Fight the Power! Review and Commentary/@comment-107.167.113.160-20150817200521

All in all good chapter. All I could say is may be fairy heart/lumen histoire could be either a key in unlocking the book of E.N.D or a magic that can be used to enhance and increase the magic power of mages and/or counter the effects of zeref's ankhseram black magic.