User blog comment:IamJakuhoRaikoben/Chapter 450: Alone in all the World, Review./@comment-112.198.77.31-20150831081619

i think the reason why zeref wants the lumen histoire is seemly solved here,maybe: 1.he wants to revive her using the methods he done on Natsu then,they both find a solution in order to end their curses 2.he wants to study mavis body to find a solution on how to kill himself,since mavis dies after he kissed zeref.maybe he want that factor to use it to himself in order to kill himself.