This planet serves as a turning point for Anakin's transition to Darth Vader. Where does he lose a battle to Obi-Wan?

Anakin Skywalker, then transforming into Darth Vader, was sent by Darth Sidious to Mustafar to kill all of the Separatist Council. He was defeated on the lava planet by his former Jedi master, Obi-Wan, who left him there to die. Instead, although he was severely injured, Sidious whisked him off, where he was transformed into a cyborg.

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