Duel on Mustafar

The Duel on Mustafar was a confrontation during the Great Jedi Purge in 19 BBY, where the recently apprenticed Sith Lord, Darth Vader, clashed with his former best friend and Jedi Master, Obi-Wan Kenobi, on the Outer Rim planet of Mustafar. After gaining knowledge of Skywalker's downfall from Grand Master Yoda at the Jedi Temple, Kenobi arrived on Mustafar, where he attempted to reason with Vader, not believing that Emperor Palpatine, also known as the Sith Master, Darth Sidious, had taken control of his mind. However, Vader no longer cared for their friendship, and quickly claimed that Kenobi was his enemy; the pair then ignited their lightsabers and locked blades, fighting through the murder scene in the Klegger Corp Mining Facility, where Vader had recently slaughtered the members of the Separatist Council, the legislative branch of the now-defunct Confederacy of Independent Systems.

The fight progressed on the structures of the massive facility that hovered over the deadly lava of Mustafar. Kenobi and Vader soon found themselves trapped on a structure collection arm connected on the facility when it was separated from the facility by the lava and descended onto a hot stream. Kenobi managed to fall onto a lava skiff that was heading in the opposite direction of the fallen collection arm in the stream. Vader soon followed suit and jumped onto a droid collector where the two continued to fight. Kenobi managed to jump onto a high lava bend slope, and claimed that the duel was over due to his advantage. The Sith attempted to follow, but Vader, in his hubris, failed to deflect Kenobi's final attack, a devastating mou kei maneuver, which severed Vader's remaining organic limbs, and Vader rolled down to the edge of the lava bend, bringing the duel to an end.

Then, Kenobi—overcome with remorse over his friend's transformation—cried out that he had believed that Vader was the Chosen One and his destiny was to destroy the Sith, but instead he joined them. Unable, but most likely unwilling, to connect with his former best friend, the Sith was consumed by the fires of the lava that leaked onto the lava bend; leaving Vader to die, Kenobi retreated and took his fallen apprentice's lightsaber. Afterwards, Vader's new master, Darth Sidious, found his injured apprentice and took him back to the galactic capital of Coruscant to be rebuilt; the suit that Vader donned there would be one that the Dark Lord would wear for the rest of his life.

Text and facts from the “Duel on Mustafar/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.