After an entire year, Fire Emblem Heroes’ sixth book is coming to an end. You can see the book ending video, titled Princess’ Pledge, above.
Although there is a peace mending between Askr and Embla in Book 6, villages in Askr and Embla are being consumed by darkness and isolated from the rest of the world. Investigating this phenomenon, the Order of Heroes cooperate with the dragon Askr’s retainer Ash and Princess Veronica to find a solution to reverse it. However, a coup is being planned to get rid of Princess Veronica, and that the one responsible for the darkness in the first place is a power that rules over Embla: the dragon Embla herself.