Mission to Mustafar/Legends

The Mission to Mustafar at the end of the Clone Wars in 19 BBY was Darth Vader's mission to kill all the leaders of the Confederacy of Independent Systems.

Killing the CIS leaders
When Darth Vader arrived at the control bunker on Mustafar, Nute Gunray, San Hill, and the other members of the Separatist Council welcomed him. They had previously received a communication from Darth Sidious, who had told them to expect his new apprentice. At the time, the Separatist leaders were demoralized by their recent defeats in the Outer Rim Sieges, the loss of Count Dooku, and their sudden withdrawal from Utapau shortly before the Battle of Utapau. Many of them wanted to sue for peace with the Galactic Empire (which had until recently been the Galactic Republic).

However, Vader immediately closed the doors of the bunker, trapping the Separatist leaders, their aides, and their bodyguards within. Vader immediately attacked the battle droids and other guards. The Separatist leaders attempted to flee or beg for their lives, but to no avail. Within minutes, Vader had liquidated the entire council and their aides &mdash; Po Nudo and his aide, Poggle the Lesser, San Hill, Passel Argente and his aides (including Denaria Kee), Lott Dod, Rune Haako, Shu Mai, Wat Tambor, and finally, Nute Gunray. He attempted to reason with the young Sith Lord, saying, "The war is over! Lord Sidious promised us peace! We only want-" but to no avail. After killing Gunray, Vader went to report his success to his master.

Anakin/Vader vs. Obi-Wan
While Vader was successful in carrying out his mission, his wife Padmé Amidala soon arrived to challenge him about his involvment with the massacre at the Jedi Temple on Coruscant. As she attempted to reason with him, Vader noticed his old master Obi-Wan Kenobi on board her spaceship. Believing himself betrayed, Vader choked his wife into unconsciousness. Kenobi also tried to talk to his former student, but without success. Kenobi was forced to fight Vader.

Kenobi and Vader's duel raged on through the mining complex and the lava flows of Mustafar, until Vader's three natural limbs were severed by Kenobi's lightsaber. Vader tried to crawl up the banks of a river of lava, but the heat from the nearly lava flow soon caused his clothing and body to burst into flames. Taking Vader's lightsaber, Obi-Wan left his former student to die, and departed from Mustafar with the injured Padmé. However, Vader's strong will kept him alive until his master, Darth Sidious, arrived to rescue him.

Aftermath
With the Separatist Council dead, and most of the Jedi killed after he had issued Order 66, Darth Sidious (better known as Emperor Palpatine) was left in undisputed control of the galaxy.

In order to save his life, Vader was taken to the Emperor Palpatine Surgical Reconstruction Center on Coruscant. Now a cyborg, Vader would wear a respirator and full body suit for the rest of his life. Padmé Amidala was not so lucky &mdash; 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.

Appearances

 * Star Wars Episode III: Revenge of the Sith