Duel on Mustafar/Legends

The Duel on Mustafar was the event in the Great Jedi Purge in which Darth Vader was injured by Obi-Wan Kenobi and had to undergo reconstruction and surgery.

Prelude
The duel occured in the aftermath of the Mission to Mustafar, in which Darth Vader slaughtered the Separatist Council and ended the Clone Wars. He met up with his wife, Padmé Amidala, during the aftermath of the massacre. Obi-Wan Kenobi, hiding in the cargohold of her Naboo Skiff, appeared to Vader, making it seem like it was a trap laid out by Padmé. In his rage, Vader strangled his wife to near death, knocking her unconscious. The former best friends were forced to confront each other in battle.

The duel
The two battled each other on the landing platform and made their way through the hallways of the mining facility. In the conference room, Vader forced Kenobi's lightsaber handle into his throat, temporarily paralyzing him, and attempted to decapitate his former master. Kenobi managed to fling himself out of his former padawan's grasp, and the two proceeded into the control room. The two forced each other into opposite ends of the room with a combined of Force push. Attempting to kill Kenobi, Vader jumped at the Jedi and missed, accidentally destroying the controls for the facility's shields, allowing heat and flying lava to weaken the bridge system outside the complex.

As the two dueled on the bridge outside, the lack of shielding proved too much for the superstructure, bringing it down. The magmatic river below dragged the bridge down a lavafall, and nearly killed Vader. However, both he and Kenobi managed to leap off the bridge, landing on a droid lava collector and a repulsorlift platform, respectively.

Fall of Vader
"It's over, Anakin! I have the high ground!"

- Obi-Wan

"You underestimate my power."

- Anakin

"Don't try it!"

- Obi-Wan

As the two dueled their way to the shore, Obi-Wan jumped and gained the high ground. Vader foolishly risked his life and jumped at Obi-Wan, getting his three remaining organic limbs severed. He tumbled down to the shoreline, ignited on fire, and had his flesh burned off. Kenobi left him to die in agony.

Aftermath
Palpatine, accompanied by a squad of Shock troopers, rescued his dying apprentice and took him to Coruscant. In order to save his life, Vader was taken to the Emperor Palpatine Surgical Reconstruction Center for treatment. Now a cyborg, Vader would wear a respirator and full body suit for the rest of his life.

Padmé Amidala was not so lucky—her injuries on Mustafar, as well as the horror of seeing her husband consumed by the dark side, contributed to her death in childbirth on Polis Massa.

Kenobi went into exile after helping to deliver Anakin's children on Polis Massa. He and Anakin's infant son Luke went to Tatooine, while his twin sister Leia went to Alderaan as the adopted daughter of Bail Organa. Kenobi hid on Tatooine, waiting for the day Luke would be trained as a Jedi.

Appearances

 * Star Wars Episode III: Revenge of the Sith
 * Dark Nest III: The Swarm War