User blog comment:BlackWizardZeref/Fairy Tail: Chapter 436 Memoirs Review with a brief mentioning of Chapter 435 Victory Shout!/@comment-24546844-20150519194644/@comment-203.177.75.27-20150521082819

Reply to your reaction/comment about his theory: The eclipse that got destroyed was from the future, after, according to his theory, Natsu was sent to the future to escape his timeline.

Reply to your 2nd comment: I think that, according to his theory, END was sealed in the book 400 yrs ago. Before Natsu was sent to the future. Then after Zeref sent natsu, Tartarus was form and They found the book of END and since it was Zeref's greatest and most powerful Etherious demon, they hailed it as their guild master.