Kingsglaive: Final Fantasy XV (2016) Plot Summary Explained

Kingsglaive takes place on the Earth-like world of Eos, running parallel to the opening events of Final Fantasy XV. The kingdom of Lucis is home to a magical Crystal, given to humanity by the world's deities and used by the ruling Caelum dynasty to defend Lucis from invaders via a magical barrier known as the Wall. The Crystal is kept in a special chamber within the Royal Citadel, its powers only accessible through the hereditary Ring of the Lucii. For centuries, Lucis has been at war with the militaristic and technologically advanced empire of Niflheim, which has conquered the other nations using its Magitek armies.

Lucis's crown city Insomnia is protected from Niflheim by the Kingsglaive—an elite corps made up of immigrants from beyond the city limits with whom the Crystal's power are shared by the ruling monarch Regis Lucis Caelum CXIII. The film opens with Regis accepting a peace treaty with Niflheim: as part of the treaty, Regis must cede the territories around Insomnia to Niflheim and have his son Prince Noctis marry Lunafreya Nox Fleuret, former princess of Tenebrae.

During a visit to Tenebrae, Regis and Noctis—who is recuperating from a near-death experience—are targeted for assassination by Niflheim. Tenebrae is subsequently attacked, and in the invasion Queen Sylva is killed by Niflheim's General Glauca. Regis attempts to flee with Lunafreya, but she decides to stay with her brother Ravus; both become subjects under Niflheim's rule.

Twelve years later, the Kingsglaive fight to protect Lucis's borders from attacks by Niflheim's Magitek army and Daemons, unnatural monsters tamed for military use. During one such operation, Nyx Ulric defies his orders to withdraw to rescue his friend Libertus from a Daemon. Regis, whose magic powers the Wall and is growing weaker due to advancing age, accepts Imperial Chancellor Ardyn Izunia's offer of peace. This causes dissension among the Kingsglaive, who feel Regis is abandoning their families. Two days before the treaty is to be signed, Kingsglaive member Crowe is sent on a mission to escort Lunafreya to Altissia to meet Noctis, but is killed en route. Her death causes Libertus to leave the Kingsglaive and join a group of Lucian rebels. At a party dedicated to the signing of the treaty, attended by both Regis and Niflheim's emperor Iedolas Aldercapt, Lunafreya meets with Nyx before being secretly abducted by Glauca. Nyx discovers this and finds that Niflheim has stationed their army outside Insomnia.

Regis agrees to deploy the Kingsglaive, although their commander Drautos has disappeared. While Nyx succeeds in rescuing Lunafreya, many of the Kingsglaive turn on him; Nyx, Lunafreya and rebel leader Luche Lazarus escape as the ship disintegrates. At the treaty-signing ceremony, the Niflheim delegation springs a surprise attack and kills the ruling council, while their army enters by destroying the Wall with help from the rebels, who are subsequently massacred. Lunafreya and Nyx reach the Citadel just as Regis is battling Glauca. During the fight, Glauca cuts the Ring of the Lucii from Regis's hand. Ravus attempts to put on the Ring and claim its power, but it rejects him and destroys his arm before he can remove it. Nyx, Lunafreya and Regis retrieve the Ring and flee with Glauca in pursuit. Regis forces the two to go on without him, dying in his ensuing battle with Glauca. Aldercapt and Ardyn—having successfully stolen the Crystal—leave Insomnia to be destroyed by Niflheim's Daemons.

Summoned to the city plaza by a call from Drautos, Nyx and Lunafreya are cornered by Luche, who reveals himself to be Crowe's killer. Luche almost kills Nyx before being tricked by Lunafreya into putting on the Ring, resulting in his death. Drautos then appears, but is attacked by Libertus, who reveals that Drautos is in fact Glauca. Just as Glauca is about to kill them, Nyx puts on the Ring. He is confronted by the spirits of the past kings of Lucis; initially rejected due to being not of their bloodline, his resolve and the threat to the Crystal persuade them to allow his use of their power at the cost of his life. After fending off Glauca, Nyx returns the Ring to Lunafreya before entrusting her to Libertus, telling them to flee. With the Ring's borrowed power he engages Glauca in a titanic battle throughout Insomnia, animating the city's statues of past rulers, known as the "Old Wall", to combat Niflheim's Daemons. Their fight ends as dawn approaches, with Nyx mortally wounding Glauca; Nyx dies shortly after as payment for using the Ring's power, wishing for Noctis to rule well in the future. In the aftermath, Libertus escorts Lunafreya out of the city, but she tells him to stay behind. Lunafreya then leaves with the Ring to find Noctis.

In a post-credits scene, Noctis and his companions are en route to Altissia when their car breaks down, leading into the opening scenes of Final Fantasy XV.