User blog comment:FairyRaven/Fairy Tail Chapter 465: 400 Years, Review and Commentary/@comment-25111584-20151207131906/@comment-71.222.52.171-20151208063213

Dude we have no idea what is going on with the book of END and considering both Igneel and Zeref have both stated that Natsu will have to fight and be given the specific choice on weather END lives or dies as stated respectively thus END could still be a split personality and a level up for Natsu.