Mustafar was a small planet located in the Mustafar system of the Outer Rim Territories, coreward of Rutan, between the Hydian Way and the Ninth Quadrant.
A fiery volcanic world where lava was mined like a precious natural resource, Mustafar often served as a place to dispose of unwanted evidence, a quality which drew Black Sun to the planet.7 During the Clone Wars, when Darth Sidious hired Cad Bane to kidnap Force-sensitive children so he could conduct Sith experiments, Anakin Skywalker and his Padawan, Ahsoka Tano went to recover the 2 children already kidnapped by Bane. When nurse droids noticed the Twilight, Anakin’s personal ship incoming, Darth Sidious ordered the droids to let the building sink into the lava river. They complied and hid in the dark building with the children. When the Jedi entered the doomed facility, the droids attacked the Jedi, but to no avail. In the end, Skywalker and Tano freed the children, returned them to their homes, and the facility was no more as it sank beneath the fiery waves. It also drew the Sith: it was on Mustafar that Darth Maul began his Sith training. Mustafar also served as the last capital of the Confederacy of Independent Systems, and was the site of the Separatists’ downfall, an event that shaped galactic history. In a duel that followed, Darth Vader fought his former master, Obi-Wan Kenobi, and lost, as a result of which he was forced to wear dark armor for the rest of his life.
Once a lush green world, Mustafar was home to a Jedi Enclave built around 5300 BBY. Jedi Master Chu-Gon Dar, an individual whose mastery of physical Force was unmatched, also lived there.3 He created a unique Force-sensitive object while on the planet known as the Chu-Gon Dar cube which was used to both channel and manipulate the physical Force to alter the physical properties of an item placed inside it. However, in 3996 BBY, the resurgent Sith wished to exterminate the Jedi, and so a climactic battle took place on the planet. This battle was so intense that one of the nearby gas giants was pulled into its current location by the Force, starting the gravitational tug-of-war. The environmental hazards caused by this forced the Jedi to abandon their temples on the planet.3 This caused all knowledge of Chu-Gon’s cube to be lost. Mustafar would also be the home of the Force organization the Blackguard.
Mustafar was home to two variants of sentient Mustafarians—the northern Mustafarians, who were tall and thin, and the southern Mustafarians, who were short and squat. Centuries ago, a cataclysmic eruption destroyed all Mustafarian settlements except for Fralideja.