The Duel on Mustafar, also known as the Battle on Mustafar, was a lightsaber duel where Anakin Skywalker, now the recently apprenticed Sith Lord, Darth Vader, fought his former Jedi Master and best friend, Obi-Wan Kenobi, on the planet Mustafar in the Outer Rim. After learning of Skywalker's downfall with Grand Master Yoda at the Jedi Temple, Kenobi arrived on Mustafar, where he attempted to reason with the fallen Jedi, not believing the Sith Master known as Darth Sidious, revealed to be…