Final Fantasy XV: Reclaim Your Throne trailer

an armistice is declared between the kingdoms of Lucis and Niflheim, ending the cold war that has raged over possession of the world's last crystal. A peace treaty is finally drawn up, and as part of the agreements, Prince Noctis of Lucis is to marry the Lady Lunafreya of Tenebrae. After Noctis leaves on the day the official treaty is to be signed, Niflheim invades Lucis and takes the nation's crystal for its own before launching attacks on Solheim, Tenebrae and Accordo. Noctis and his friends now journey to retrieve their kingdom's crystal and defeat Niflheim's forces.