User blog comment:Miskos3/Fairy Tail 531: Pegasus vs. Black Dragon/@comment-25324252-20170418055253

Ok new theory, Natsu's book has been collecting the excess power of all of his friends all this time and by opening it, Natsu will have all their friendship powers, becoming the Ice Lightning Iron Poison Shadow White Sky Celestial Knight Fire Dragon Slayer. If this happened, I would be so thoroughly entertained that I would call Fairy Tail a good manga