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To complete the Seal of Flames, you need the other four divine weapons. Once you have them, the Seal of Flames will become the Fire Emblem. [...] Without that, you have no chance of succeeding in your quest... Don't lose heart. Continue down the path you've chosen.
Corrin and his/her group arrive in Notre Sagesse, and he/she immediately begins asking the locals about the whereabouts of the Rainbow Sage. The old man he/she is speaking to recognizes him/her sword as the Yato, and questions why he/she is seeking out the Rainbow Sage in the first place. The old man directs Corrin to the Sevenfold Sanctuary to find the Sage, warning him/her not to die on his/her way up the mountain. The group begins to tire on their way up the mountain, until they finally reach their destination. Corrin warns the group that actually meeting the Sage will not be an easy task; Corrin's assumption is right, as they encounter illusions who challenge them on their way to the Sage.
During their trial, a Kohgan arrives at the sanctuary, seeming to seek audience with the Sage as well so that he can receive the strength to rebuild his nation. Corrin meets with him, and surmises that he is a thief looking to steal from the sanctuary. Shura denies this, stating that he wants the Sage's gift of strength to topple the daimyo of Mokushu, as revenge for destroying his homeland. Corrin tells him that they already defeated the daimyo prior. He recognizes Corrin as the kidnapped Hoshidan prince, and agrees to help him/her on his/her quest. A mage later arrives, seeking to avoid the war. Corrin suggests giving her refuge, to which she responds to leave her alone. Corrin continues to urge her to join them, and she is eventually convinced.
After completing the illusions' trial, Corrin enters the final door, which takes him/her back to the house where he/she spoke to the old man. The old man reveals himself to be the Rainbow Sage, and Corrin tells him that he/she is seeking out a dragon to stop the war. The Rainbow Sage first takes the Yato and unlocks its power, transforming it into the Alpha Yato. He tells Corrin that, once the Yato meets thefourdivineweapons, it will be completed and become the Fire Emblem. The Rainbow Sage then collapses, prompting Corrin to urge Sakura and Elise to heal him, which the Sage advises against, saying that his time in this world has come to an end. After mentioning "human magic" not working on him, he reveals himself to also be the dragon Corrin was searching for—one of the twelve First Dragons, and the creator of the Yato and the divine weapons—and that he could not die until he atoned for making them. The Sage finally passes on, telling Corrin to make his/her own destiny. Corrin directs the group to move out to the Bottomless Canyon once and for all. The player may save their game at this point.
Upon returning to My Castle, Lilith asks Corrin if she could have a moment of his/her time, then reveals that a familiar face has come to see him/her. Jakob/Felicia appears and states that he/she see that Corrin is doing well, and that he/she could not rest until they found him/her once word reached to him/her that Corrin went missing, stating he/she been traveling across dimensional barriers and states that now that he's/she's by Corrin's side again, that he'll/she'll now fight alongside him/her. Jakob/Felicia will now be available to the player's army at this point.
The group begins to climb the Sevenfold Sanctuary, hoping to meet the Rainbow Sage. They find that the road up is not an easy one.
Defeat:Corrin dies* or the player's army is routed*
This chapter's map is 30 columns by 30 rows.
This chapter features stairs that act as warp points between the rooms; by using the "Stairs" command while standing on them, a unit will be transported to the endpoint, and will be left with a movement stat = their base movement - the movement it took to reach the stairs. They are located as follows:
Column 6, row 29–Column 3, row 25: Links the starting room and the southwest room
Column 15, row 29–Column 25, row 28: Links the starting room and the southeast room
Column 9, row 20–Column 2, row 16: Links the southwest room and the northwest room
Column 19, row 23–Column 3, row 19: Links the southeast room and the northeast room
Column 7, row 10–Column 11, row 18: Links the northwest room and the central room
Column 23, row 10–Column 19, row 18: Links the northeast room and the central room
Column 15, row 13–Column 15, row 9: Links the central room and the boss room
Automatically at the end of the chapter (If Corrin is female)
Note: Felicia is only a returning character if Corrin is male, while Jakob is only a returning character if Corrin is female. The returning characters list does not include any characters recruitable in paralogues or xenologues, as the player may not have taken on any available paralogue chapters yet. The list also does not include any bonus units, as they are recruitable at the player's discretion.