Mission to Mustafar (19 BBY)

"The Chancellor has given me a very important mission. The Separatists have gathered in the Mustafar system. I'm going there to end this war. Wait for me until I return&hellip; things will be different, I promise."

- Darth Vader to Padmé Amidala

In 19 BBY, Darth Sidious, the Dark Lord of the Sith and Supreme Chancellor of the Galactic Republic, sent his new apprentice, Darth Vader on a mission to kill the remaining members of the Separatist Council on the volcanic planet Mustafar. The Council, consisting of the surviving top members of the Confederacy of Independent Systems, was a loose end in Sidious's plot to gain control of the Republic and mold it into the galaxy's first empire.

Vader willfully carried out the slaughter after trapping the council in their war room, killing each council member one by one. The bloodbath ended with the death of Nute Gunray, the Viceroy of the Trade Federation and one of the most influential members of the Council. As the violence came to an end, Vader received the order to send a shut down signal to all battle droids part of the Separatist Droid Army, ending the Clone Wars that had spread across the galaxy for the past three years. This, coupled with the Chancellor's Declaration of a New Order at the Galactic Senate, secured Sidious's position as the Galactic Emperor of the New Order.

Before Vader was able to leave the planet, he was intercepted by his wife, Senator Padmé Amidala of Naboo, who inadvertently smuggled Vader's old master, Obi-Wan Kenobi, to Mustafar. The ensuing confusion caused Vader to accidentally wound Amidala in his rage. An epic duel between the two former companions ensued, leaving Vader heavily wounded and burned.

Prelude
"The plan has gone as you had promised, my Lord." "You have done well, Viceroy. When my new apprentice, Darth Vader, arrives, he will take care of you."

- Nute Gunray and Darth Sidious



During the Confederacy of Independent Systems' invasion of the galactic capital, Coruscant, Count Dooku, the Head of State of the Separatist Council and the Confederacy, was executed by the Jedi Knight Anakin Skywalker at the urging of Palpatine, in actuality Dooku's master, Darth Sidous. Following this loss, General Grievous, the Supreme Commander of the Separatist Droid Army, assumed direct control over the Council, which at the time was based on the sinkhole planet Utapau.

Grievous's first action, under Sidious's guidance, was the Council's transfer from Utapau to Mustafar: Sidious knew of the impending offensive on Utapau led by General Obi-Wan Kenobi. The Council settled itself into the Klegger Corp Mining Facility. Around this time, an assassination attempt on Sidious led by the renowned Jedi Master Mace Windu resulted in Anakin Skywalker becoming Sidious's new Sith Apprentice, given the moniker Darth Vader. Vader, believing wholeheartedly in Sidious's abilities to save his wife, Padmé Amidala, from death, led the 501st Legion of clone troopers to the Jedi Temple to massacre the Jedi Order.

Following the destruction of the Jedi Order, Sidious ordered his apprentice to go to Mustafar, where he was to kill the surviving members of the Separatist Council. Sidious told Nute Gunray, the Viceroy of the Trade Federation, that his apprentice would reward them for their loyalty during the Clone Wars.

The assassinations
"Welcome, Lord Vader. We've been expecting you."

- Nute Gunray

When Darth Vader arrived at the control bunker on Mustafar, Nute Gunray, San Hill, and the other members of the council welcomed him. 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. Many of them wanted to sue for peace with the Galactic Empire (which had until recently been the Galactic Republic).

However, upon his arrival, Vader immediately closed the doors of the bunker, trapping the Separatist leaders, their aides, and several B1 battle droids within. Engaging in a rampant killing spree, Vader destroyed the battle droids and killed the members of the Neimoidian Gunnery Battalion before looking to his targets. Vader first slaughters Denaria Kee, Tikkes and Nudo's Aqualish Aide. The remaining Separatist's flee. Vader went after them and killed Passel Argente, Nudo's Shi'ido Aide, Cat Miin and Shu Mai. Vader then strode after and killed an Neimoidian, Po Nudo, San Hill, Poggle the Lesser and Rute Gunnay next while Nute Gunray watched in horror. Rune Haako and Wat Tambor fled into the conference room to avoid Vader, but Vader slaughtered both Haako and Tambor. Vader finally cornered Nute Gunray, whom he despised most of all for his attempts to kill Padmé Amidala, Vader's beloved. Gunray pleaded for his life but to no avail, Vader executed him. As he surveyed the carnage, his eyes turned a red-rimmed yellow, a trait common among those immersed in the dark side.

Aftermath
"The Separatists have been taken care of, my master.''" "''It is finished, then. You have restored peace and justice to the galaxy."

- Darth Vader and Darth Sidious

With the death of the Separatist Council, Vader received the order to end the Clone Wars by sending a shut down signal to the entire Separatist Droid Army. This action effectively ended all combat operations between the Galactic Empire and the Confederacy of Independent Systems across the galaxy.

Before Vader left the planet, his wife Padmé Amidala arrived to question him about his involvement with the massacre at the Jedi Temple on Coruscant. She hadn't realized that Obi-Wan Kenobi, Vader's former master, had smuggled himself on board her ship, and when Kenobi exposed himself to Vader, it looked as if Amidala had brought him to Mustafar. Believing himself betrayed, Vader choked his wife into unconsciousness. Kenobi also tried to reason with his former Padawan, but without success. Kenobi was forced to fight Vader. Vader was severely injured in the ensuing duel, but was rescued by Palpatine and some clone troopers. However, his condition was so critical that he was forced to spend the rest of his life in a life support suit.

After the massacre of their leaders, the Trade Federation and the Techno Union were forced to turn over their assets to the Empire, while the Corporate Alliance and the Commerce Guild quietly dissolved. The InterGalactic Banking Clan, however, survived the catastrophe, though it was much less successful than before.