The series resolves its multi-century narrative through several key revelations:
- The Dragon Slayers' Past: Natsu, Gajeel, Wendy, Sting, and Rogue were orphans from 400 years in the past. Their foster dragons sealed their souls within the children to prevent dragonification and traveled through the Eclipse Gate to defeat Acnologia in the present era.
- The True Identity of E.N.D.: Natsu Dragneel is the resurrected younger brother of Zeref, created as the ultimate Etherious demon (Etherious Natsu Dragneel) designed specifically to kill the immortal dark mage.
- Mavis and Zeref’s Cursed Fate: Mavis Vermillion shared Zeref's Curse of Contradiction. Their mutual love caused a paradoxical surge that placed Mavis in suspended animation, generating the infinite magic source known as Fairy Heart (Lumen Histoire).
- The Finale: Lucy rewrites the Book of E.N.D. to sever Natsu's life-link to Zeref, enabling Natsu to fight as a human. Zeref and Mavis perish together in an embrace of mutual love that dissolves their curse. The seven Dragon Slayers destroy Acnologia’s spiritual core, ending the dragon threat and restoring peace.