Linhardt is a memory witch — he extracts people's memories and freezes them in Crest necklaces to be revisited whenever by those who needs it. He has no memories of his life, however, no sense of time or space but the present. Byleth stumbles into his store one day, and Linhardt starts to remember.
– Tag THE BLACK EAGLES
Five years ago, tensions between the three most influential crime houses in Fodlan came to a head and culminated in the largest turf war the city had ever seen. Now Byleth, a mercenary who’s sold their services to each of the houses at one time or another, emerges after years of silence as the head of the Church of Seiros, resurrecting an old, impotent house and flipping people who once belonged to the other houses. They look like they’re on a mission to reestablish the Church as the powerhouse it used to be, but are their motives really so clear cut?
An ancient secretive group seeks to bring forth their leader in a new body while the remnants of their last attempt mass forces to interfere with their plans. (In which Rhea is up to even worse tricks than usual, El is a failed vessel, and the Black Eagles (and friends) attempt to interfere with a potentially world-ending ritual.)