Fortress Vader

"The Dark Lord of the Sith in his obsidian fortress. It was once said that Mustafar was the planet to which Jedi went to die."

- Snoke

Fortress Vader was the personal castle and abode of the Dark Lord of the Sith Darth Vader on the planet Mustafar. Gifted to him by his master, Darth Sidious, the castle was a place where Vader attempted to center himself, assisted by the comfort of a consort.

Description
"He came to Mustafar to... center himself. To focus his anger and his rage. Something about the planet fueled him, but as you say, My Lord, he wasn't entirely... whole. The effort caused him discomfort. I was sent to... comfort him in those moments."

- The Supreme Hand, on Darth Vader to Snoke

Fortress Vader, constructed by Darth Vader himself, served as the Dark Lord's personal castle and abode. Obsidian catacombs resided beneath the structure. The black castle, itself made of obsidian, was accessed via a black gate, and contained a private bacta tank in which Vader convalesced.

Pre-construction
On his first visit to the lava world of Mustafar, Darth Vader, formerly the Jedi Knight Anakin Skywalker, confronted his wife, Padmé Amidala, and Obi-Wan Kenobi, the latter of whom maimed and betrayed him, leaving him in the lava. Vader would retain enraging thoughts about Mustafar, which his master, Darth Sidious, intended to stoke by gifting him with his castle.

Creation and usage
"And instead of a ceremony, where was it the Empire brought you?" "To Mustafar. To the black castle of Darth Vader the strong."

- Snoke and his Supreme Hand

Vader constructed his obsidian castle as his personal abode on Mustafar, and both the castle and its creator were circled by superstition among the Imperial elite. The fortress was protected by guardsmen and attended by a servant. Vader came to Mustafar to center himself, able to focus his anger and rage while fueled by the planet and the memories of his first visit there. However, the effort discomforted him.

One of the Sylphe war-dancers was taken by an Imperial ambassador to what she believed would be a ceremony to make use of her Sholân Kha skills. However, she discovered she was being taken to Vader's castle, and was ushered through the black gate in terror. She encountered Vader's guardsmen and the castle's servant, and learned to comfort Vader as his consort when he attempted to center himself in his abode. She wore chestnut-colored hair that was said to be to Vader's liking, and though she served him well the experience wasn't pleasant, and in the years after she endeavored to distance herself from her time in the fortress. In addition to her, other slave girls were sent to soothe the Dark Lord as courtesans and handmaidens, though his consorts were rarely heard from again, and their experiences terrified them with a horror beyond imagination.

The presence of Vader's castle on Mustafar led to the planet becoming known as the place where Jedi went to die. He was summoned from his castle after the Rebel Alliance learned of the Death Star project, and joined the Battle of Scarif.

After Princess Leia Organa was impregnated by the dianoga Omi inside Garbage Compactor 3263827 aboard the Death Star, Grand Moff Wilhuff Tarkin planned to have her sent to Timira City on Kamino to serve as a brainwashed pleasure slave, though Vader intended on removing her to his castle to spare her from Tarkin's scientists. He considered keeping her in the obsidian catacombs beneath his abode, but planned to show her no mercy. However, she was rescued from the N-One Medcenter by Luke Skywalker, Han Solo, and Chewbacca before either plan could be carried out.

Years after her service, Vader's former consort spoke of her time in Fortress Vader to Supreme Leader Snoke of the First Order after she was summoned to his sanctum. She believed her experiences in the forge of Mustafar had strengthened her, and she had left the castle as a different person from the terrified girl who had entered through its black gate.

Behind the scenes
Fortress Vader first appeared in the 2016 Star Wars Anthology film Rogue One: A Star Wars Story, based on early concept art of Vader's castle for Star Wars: Episode V The Empire Strikes Back. It was introduced into erotica canon with a mention in the 2017 Alternate Universe erotic fiction "The One-Eyed Monster".