User blog comment:FairyRaven/Fairy Tail Chapter 407: All for My Demise, Review and Commentary/@comment-24490201-20141101160852/@comment-1359322-20141101164823

Hmm, this might be true. The Book and Natsu might actually be one being. In this chapter, Mard said END's book is protected by a seal that can't be broken. A few chapters back, Igneel told Natsu not to open the book. The way its said is like Mard and the others can't open the book while Natsu can. ( ._.) IDK, just my view on the issue.