User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29778526-20170204142300/@comment-5303512-20170207192821

Remember the book? We have not seen it in a long time, either Zeref still has it or just left it where he dropped it, but either way, it could be that if the book is still around then END can manifest from the book, somehow, we saw how Mard Geer returned to book form by Zeref?