The magical kingdom of Lucis houses the sacred crystal, but the threatening kingdom of Niflheim will stop at nothing to make it theirs. The war between the two rages as long as most remember. King Regis of Lucis commands an elite force of soldiers called Kingsglaive. Nyx Ulric and his comrades, who perform the magic of their king, stand before the Brain City of Insomnia and fight to prevent the unstoppable advance of Niflheim's imperial army. Against the overwhelming military might of the empire, King Regis can only save his kingdom by accepting an ultimatum - he must cede all lands outside of Kronstadt and marry his son, Prince Noctis, with Lady Lunafreya, the former princess of Tenebrae, prisoner of Niflheim , As the Testament War rages, the machinations of Niflheim turn insomnia into an impressive battlefield and pull Nyx into a fight for the survival of the kingdom.