Final Fantasy XV begins as a truce is declared between Lucis and Niflheim, ending the cold war which has raged over possession of the world's crystals. Upon the day when an official treaty is to be signed, Niflheim invades Lucis and takes the nation's crystal for its own. The invasion forces Noctis and his friends to escape Lucis. Niflheim also launches attacks on Solheim, Tenebrae and Accordo, while Noctis and his group try to defeat Niflheim's forces and retrieve Lucis' crystal. Because of the war, Noctis and Stella, who share some form of connection, are forced to fight each other.