Fire Emblem: The Blazing Blade (Nintendo Cinematic Universe)

Fire Emblem: The Blazing Blade is a Japanese anime series.

Summary
Three young lords must band together on a journey to find Eliwood's missing father Elbert while thwarting a larger conspiracy threatening the stability of Elibe.

Plot Elements

 * In ancient times, humans and dragons coexisted, but humans turned against and banished the dragons in a conflict called "The Scouring".
 * A tactician is found by Lyn, a Sacean girl whose tribe and parents were killed by bandits.
 * Lyn learns from a pair of knights that her mother was actually the estranged daughter of the Marquess of Caelin, Hausen, who seeks to reconcile with his daughter's family. She begins a journey to Caelin to reunite with her grandfather but comes under attack from Hausen's avaricious younger brother Lundgren, who wants to kill both her and Hausen to take power in Caelin for himself.
 * During her quest, Lyn protects a traveling bard named Nils from an assassin guild called the Black Fang, while his sister Ninian is rescued by Eliwood, son of Marquess Elbert of Pherae.
 * Lyn defeats Lundgren and reunites with her grandfather.
 * One year later, Elbert disappears, prompting Eliwood and his friend Hector, younger brother of Marquess Uther of Ostia, to investigate.
 * The pair discover that the Black Fang has incited Marquess Darin of Laus to rebel against Lycia, and Elbert was captured when he refused to cooperate. After rescuing Lyn from Darin's troops, the three pursue him to the Dread Isle. There, they reunite with Ninian and Nils and learn that the Black Fang is being manipulated by a sorcerer named Nergal; he seeks to provoke a full-scale war in Elibe, providing him with an enormous amount of "quintessence", or life-force from fallen warriors, and force the siblings to open the Dragon's Gate and summon dragons to Elibe.
 * The party kills Darin, but Elbert dies delivering a grave wound to Nergal.
 * The party returns to Ostia to report recent events to Uther, who directs them to the western desert of Nabatea. There, they meet Archsage Athos, who sends them to Bern to find the Shrine of Seals.
 * In Bern, the heroes save Prince Zephiel from an assassination attempt orchestrated by his jealous father, King Desmond. Out of gratitude, the queen of Bern gives them directions to the Shrine of Seals.
 * At the Shrine, the party meets the ancient hero Bramimond, who unseals the Blazing Blade Durandal and the Thunder Axe Armads so they can oppose Nergal. However, Nergal returns and captures Ninian.
 * The heroes collect the legendary weapons, but Nergal tricks Eliwood into killing Ninian, who along with Nils is revealed to be a half-dragon.
 * The group returns to Ostia, where Hector learns that Uther has died of an illness.
 * The party and Athos return to the Dread Isle and defeat Nergal, who summons three dragons with the last of his strength.
 * Bramimond arrives and resurrects Ninian, who banishes two of the dragons; the heroes slay the last dragon in battle.
 * In the aftermath, Athos expends all of his energy and predicts a future conflict originating in Bern before passing away.
 * Nils and Ninian return through the Dragon's Gate and seal it.
 * Eliwood becomes marquess of Pherae, Hector inherits his brother's title as marquess of Ostia, and Lyn abdicates her claim over Caelin and returns to Sacae.
 * Fifteen years later, Eliwood and Hector reunite, introduce their respective children Roy and Lilina to each other, and discuss the recent assassination of Desmond.
 * Meanwhile, the embittered Zephiel is confronted by a robed man who accuses him of awakening a demon dragon.