In the dragon graveyard, Arcadios explains to Fairy Tail what he needs from them to make Project Eclipse work. He takes them to the king's palace, Mercurius, and shows them Eclipse, the actual portal designed to take a party back in time to kill Zeref! But not everyone in the kingdom is on board with changing history...
When it's opened, the plan is
وعندما يُفتح، تقضي الخطة بأن نعود 400 عام
إلى الوراء ونُجهز على زيريف قبل أن يصبح خالداً