Actions of the movie "Kingsglaive: Final Fantasy XV" happens in the fictional world, in the magic kingdom Lucis. Lucis is a great Empire of magic and Niflheim is the War Empire of machines. The King is at War with the Niflheim Empire. They will not stop before anything to capture the ancient halidom called by the Sacred Crystal. Lucis have to agree with the surpassing army conditions of the neighboring kingdom. He concedes the lands and marries the only son to the princess Lunafreya whose family owned the occupied Tenebraeís lands. Nyx Ulric was always devoted to the king. He doesn't stop fight with the formidable enemy and expect to win only.