Fairy Tail 415 see’s Natsu crying to Acnologia’s death, however he promises to live on, get stronger and turn Acnologia into dust for what he’s done. Skiadrum, Metalicana, Grandeeney and Weisslogia all abide to the Magna Carta where they all promise to protect mankind for the rest of eternity. They all disappear within minutes, everyone says their goodbye with heads up high.
Fairy Tail 215 continues with Natsu and others battling against Ophiuchus who reveals that all she is doing is for the King, thus it’s all been their plan. On top of which, Fairy Tail has helped in sending the Spirits back to where the King is, thus helping the King to obtain greater power, which has been their plan all along.