Dark Lord: The Rise of Darth Vader

Dark Lord: The Rise of Darth Vader by James Luceno
After joining the dark side, destroying the Jedi, and losing his only love, Anakin Skywalker must learn to live as the villain Darth Vader and earn his place in the new Galactic Empire.

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This is a prequel era book from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe).