Recap of the Revelation branch of Fire Emblem Fates.
With no hope of communication between the warring countries for the meantime, Corrin and Azura proceed down a third path: one which will see them fighting against both Hoshido and Nohr.
After returning back to the real world thanks to the assistance of an unknown woman, Corrin announces his intention to unite both Hoshido and Nohr against Anankos before the path to Valla is closed for the next few decades. Azura suggests seeking an audience with Hoshido first, believing them to be more responsive.
Meanwhile, Corrin's party are heading to the Eternal Stairway to Izumo. However, they are ambushed by Faceless on the way, and they are dispatched. But they are revealed to be members of the Wind Tribe under an illusion! The party realizes they need to explain what happened. Unsurprisingly, they are met with anything but a warm welcome, with Fuga, the Wind Cheiftain, enraged over the attack and has heard of rumors over him planning to destroy both kingdoms. Rinkah, the same woman who was spared back in Nohr, decides to fight for Corrin, believing in him.
After a long fight, Fuga is convinced that Corrin means well. After a clearing, Hayato offers to join, then the party resumes on the way to Izumo
After Corrin's party digs through the snow field that he plants and cornering him, Zola tries to grab a hostage in hopes of surviving, but is executed by Leo out of his disgust towards the formers cowardice, then Leo tells Corrin that he won't be so friendly as to not attack them if they meet again after showing them the location of the real Izana and Takumi.
Izana, being grateful of Corrin's rescue, tells Corrin that the Seal of Flames does exist physically, but knows nothing otherwise. He then does a communion with the gods to answer Corrin's question, to confirm that his goal is sincere and that Takumi, who isn't convinced, should go with him, then dying, claiming that he had to pay to communicate to the gods. After seeing this, Takumi decides to join after being convinced, with his retainers, a hot-blooded samurai named Hinata, and a spear fighter with a harsh sense of hatred towards Nohrains named Oboro, joining as well.
The forest where the smoke signal was made is crawling with ninja from the Mokujin tribe. Their leader, Kotaro, had allied with Garon and sided against Hoshido in the hopes of taking over the country for themselves. To that end, they had kidnapped Kagero, another ninja and retainer for Ryoma.
Corrin leads his party against the Mokujin and emerge victorious over Kotaro. Saizo and Kagero are suspicious of Corrin, but Kagero reconsiders when Takumi voices his support for Corrin. Saizo agrees to travel with Corrin to aid Ryoma, who was last seen travelling to the country of Cheve, on the Nohrian border.
Corrin emerges victorious in the battle that ensues. Camilla asks Corrin to execute her, but Corrin cannot bring himself to kill his older Nohrian sister. He, instead, invites Camilla to join him in bringing an end to the war. Camilla accepts and joins Corrin's party, as does her retainers; Selena, a fierce tomboyish swordswoman; and Beruka, a wyvern-riding assassin. Flora is also invited to join, but she declines; she wants to tend to the Ice Tribe and keep them safe, but she offers to join Corrin later.
On the outskirts of town, Hoshidans and Nohrians fight each other, led by Ryoma and Xander. Corrin tries to intercede, but both warriors believe the other attempting to invade their homelands, even though the Vallites are to blame.
Even with Ryoma and Xander at each other's throats, Corrin manages to find the leader of the Vallite soldiers in Cyrkensia and defeats them. Azura manages to quell the fighting between Corrin's elder brothers with the power of her song, dispelling the spell the Vallites cast to turn their aggression on one another.
Corrin asks Ryoma and Xander to join him, but Xander remains weary of him. Ryoma is not yet ready to join, either. Corrin becomes acquainted with Scarlet, the leader of Cheve's anti-Nohrian resistance movement. When Corrin asks about the "dragon" from Izana's prophecy, Ryoma suggests asking the Rainbow Sage at Notre Sagesse, a wise old man who had been approached by Ryoma, Xander, King Sumeragi, and Garon before.
At Port Dia, Corrin is accosted by Nohrian troops led by a knight named Silas, who claims to be an old childhood friend. Corrin himself expresses unfamiliarity, and is subsequently attacked when the soldiers attack under orders from Garon. Unexpected assistance is provided by Elise, her retainers Arthur and Effie, and mercenaries Benny and Charlotte, who have been recruited to her cause because of their close proximity to the conflict. With their numbers advantage, Corrin's coalition successfully repel the attack.
With Silas defeated, Corrin questions why he held back despite his orders. Silas recants his tale: as children, Corrin saved his life from a wrongful execution, and he has kept this close to him since by his honor as a knight. This jogs the prince's memory, inspiring him to recruit Silas - not only to spare him from Garon's wrath, but to save Hoshido and Nohr from destroying themselves.
On the ferry, the fruits of Corrin's union begin to show results, as Elise and Sakura make each other's acquaintance and begin to bond rather quickly, with Azura wistfully spectating.
After completing the illusions' trials, the group inexplicably returns to the same hut owned by the old man, revealed to be the Rainbow Sage himself. Corrin expresses his desire to end the war by seeking out the dragon who could help them; in response, the Sage enhances the Yato's power, transforming it into the Alpha Yato. While a more fearsome weapon, its true power can only be unlocked in the presence of the four other divine weapons: the Raijinto, Fujin Yumi, Brynhildr and Siegfried - all currently owned by Corrin's brothers from both nations; doing so would lead to the creation of the Fire Emblem, the only weapon capable of felling Anankos.
With the Alpha Yato taking the last of his power, the Sage collapses and peacefully passes away. Before dying, he reveals himself as one of the first dragons - the one Corrin and Azura have been searching for - and encourages the young prince to choose his own destiny.
As with their Hoshidan counterparts before them, Xander and Leo arrive with help from their retainers: Laslow, Peri, Odin and Niles; together, this fully-unified front is able to put a permanent end to Iago's scheming. Following the battle, the Nohrian princes apologize to Corrin for not believing his words about Garon's growing madness. With their father becoming more unstable by the day, they now see that an alliance with Corrin and the Hoshidan royals is key for the survival of both their kingdoms. Ryoma agrees, and the two eldest sons - who note that they share the same common goals - finally call upon a truce to accompany their shared sibling into battle against the true mastermind.
