Fics like The Last Queen of the Alders

Hermione Granger’s magic begins to change after an encounter in the Department of Mysteries. When an ancient power awakens in her blood, it binds her to none other than Bellatrix Black and draws her into a world far more complicated than the one she knew before. A world of dangerous bargains, fairy folk, and prophecies that cannot be escaped. As the war grows closer and the bond between them tightens, Hermione must decide how much of herself she is willing to sacrifice in order to survive.

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