Fics like Stormseeker: Nexus of Souls

Time traveling Sith Lord, Darth Revan, having returned to the past where he was once known as Harry Potter, is entering his second year at Hogwarts. He discovers that the universe is not quite as he thought it was, and that he'd wound up in a universe slightly different than the one he'd been in before. And a particularly unnerving Defense professor has him worried about the future.

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