Seal of the Maelstrom

She was one, then she was two. He was whole, then he was not. They were lost, until they were found. Within a world both familiar and new, she would set them on a path of unknown destruction for the sake of no one but herself. [AU. Dark/Insert/Antagonist OC. Previously known as, 'Seal of the Uzumaki'. INDEFINITE HIATUS.]