This article is nominated to be highlighted as a featured article!

Feel free to review this article's entry and voice your opinion.

"Mustafar is not like other planets. It is unique. Deep beneath its surface rests a locus for the dark side of the Force."
―Darth Sidious[src]

An ancient Sith cave located deep beneath the surface of the volcanic Outer Rim planet Mustafar served as a locus for the dark side of the Force. The cave resided in the course of one of the planet's lava rivers on the Gahenn plains, and was strong with dark side energies.

Shortly after the rise of the Galactic Empire, the newly-christened Sith Lord Darth Vader traveled to the Sith cave to use its energy to bleed a kyber crystal in the construction of his own lightsaber following his Master, Darth Sidious's orders. Vader later decided to build a castle over the cave that could channel the power of the dark side in order to resurrect his deceased wife, Padmé Amidala. Using the designs obtained from the spirit of the ancient Sith Lord Momin preserved within an artifact, and after several failed attempts, Vader constructed a massive obsidian castle over the cave that would serve as his personal residence.

As the construction caused disasters across the entire planet, the Mustafarians, the planet's natives, launched an attack on Vader and his Imperial forces to repel the invaders. Although their attack was ultimately proved futile, it gave an opportunity to Momin's spirit to open a portal through the Force inside the Sith cave and summon his physical body, while Vader was distracted with the attackers. Momin's resurrection was short-lived, however, as Vader killed the ancient Sith and passed through the portal himself. Even though he was unable to save Amidala, the visions he experienced throughout the journey allowed him to accept his and his wife's fate.


"When you arrive on Mustafar, find the place where the dark side calls to you. Draw upon the energy there—combine its power with your own. Then… use it."
―Darth Sidious, to Darth Vader[src]

An ancient Sith cave was located on[3] the Gahenn plains[1] on the volcanic Outer Rim Territories planet[4] of Mustafar, and served as a locus for the dark side of the Force. Situated deep beneath Mustafar's fiery surface, the cave resided in the course of a river of lava, which flowed through and dropped out of the cave as a lava fall. The cave's interior featured various markings on its walls, as well as a round rock table formed at its center.[2]


Bleeding the kyber crystalEdit

"Here, you will reclaim yourself. From the site of your greatest defeat, you shall rise—strong, unbroken… powerful."
―Darth Sidious, to Darth Vader[src]
Darth Vader cave

Darth Vader enters the Sith cave for the first time.

The Sith cave resided in an area that was once the site of an ancient castle full of dark secrets,[5] and a Sith temple.[6] Shortly after the formation of the Galactic Empire[7] in the year 19 BBY,[8] the Sith Lord Darth Sidious ordered his newly-christened apprentice, Darth Vader, to steal a Jedi's lightsaber in order to construct one of his own.[7] After obtaining Jedi Master Kirak Infil'a's lightsaber,[9] Vader, again following his Master's orders, traveled to Mustafar,[2] where he had previously suffered severe burns all over his body as a result of his lightsaber duel against his old Jedi Master, Obi-Wan Kenobi.[10]

To complete the task of constructing his new lightsaber, Vader needed to draw upon the Sith cave's dark energy and bleed the stolen lightsaber's green kyber crystal—corrupting the crystal with the power of the dark side and turning its color to red in the process. After Vader placed the crystal on the cave's rock table, the markings on the walls began to glow as he experienced a Force vision in which he denounced the dark side, killed Darth Sidious, and returned to Kenobi's side. By re-embracing the darkness, Vader escaped the vision and finally bled the kyber crystal.[2]

Building Darth Vader's castleEdit

Return to MustafarEdit

"You sent me to Mustafar to bleed my kyber crystal at the dark side locus present on the planet. When I touched that power, I saw deeper into the Force that ever before. I believe things are possible at the locus that are impossible elsewhere."
―Darth Vader, to Darth Sidious[src]

Impressed by the Sith cave's dark power and the possibilities that came with it, Vader later decided to build his own fortress over the dark side locus and make Mustafar his stronghold. The Sith Lord's request was approved by Sidious, who speculated that Vader would perhaps be able to resurrect his deceased wife Padmé Amidala by using the dark side energies there. Believing that it could prove useful for Vader's quest, the Sith Master also told his apprentice to take the ancient mask that once belonged to the Sith sculptor Momin, who went against the Sith's legacy of destruction[11] and instead preferred to create artworks that would evoke pain and fear in viewers.[12]

Vader Momin

Darth Vader and "Momin" inside the Sith cave

Vader traveled to Mustafar aboard his late wife's royal starship and was accompanied by[11] Chief Imperial Architect[12] Alva Brenne along with her assistant Roggo. While Vader was meditating alone inside the cave, Roggo became possessed by Momin's mask and killed Brenne. Vader soon returned to the starship parked near the cave's entrance, and found Roggo working on the fortress' design while wearing the ancient mask. The Sith then killed the possessed Imperial with his lightsaber and retrieved the hologram of the early design.[11] Vader subsequently took the mask with him inside the cave, and used the Force to activate it, while the mask's eyes glowed red.[12] Momin's spirit[1] told Vader his story—his sculpting philosophy that he adopted as a youngling, how he was trained in the ways of the dark side by Sith Lady Shaa, and his ultimate defeat by the Jedi before he could complete his "masterpiece."[12]

By doing so, he made Vader unconsciously wear Momin's mask instead of Vader's own helmet. Taking off the mask immediately when he came to himself, Vader found an alternate host for Momin by attacking a nearby Mustafarian patrol, capturing a Northern Mustafarian named Sssp, and forcing the captive to wear the mask.[12]

Designs of Lord MominEdit

"The door to the dark side is locked. This is the key. Your beloved waits for you there, Vader. Beyond the door. My fortress will tune the energies of the locus. It is your first step toward using the power of the dark side to pierce the veil of time, between life and death."
―The Mask of Lord Momin talks to Darth Vader about his fortress design[src]
Sith cave post-castle

The Sith cave's interiors after the castle's construction

Vader and the possessed Mustafarian soon returned to the Sith cave, as Momin suggested that his design for his "masterpiece" would be the key to unlock the locus's dark power capable of resurrecting Vader's beloved and breaking the boundary between life and death—a claim he still asserted after being choked with the Force by Vader as a warning against betraying him, though Vader agreed to it.[12]

An Imperial construction site was soon established around the Sith cave, which was protected by magma troopers, AT-ACT[1] and AT-ST walkers,[13] along with TIE fighters. The Imperial forces protected the area against lava fleas that had been attacking the site since the first construction attempt, because of the location being the creatures' breeding ground as speculated by a magma trooper. After eight failed designs, with each causing powerful lightning storms and lava overflows across the planet that resulted in the construction's destruction, the castle was finally completed[1] by 5 BBY.[14] In the final design, several rectangular, inclined objects were placed around the table at the center of the cave, which served as the focusing chamber for the dark side energies.[1] The massive obsidian tower[5] was designed to channel the power of the dark side; it was divided in the middle to resemble tuning forks and harnessed Mustafar lava for energy.[4]

Attack of the MustafariansEdit

"We are not the only one affected—the entire planet screams at what the dark one is building on the Gahenn plains. […] It is time to come together…and save what is left."
―Father Kkkt[src]
Newborn Momin

Momin resurrects himself through the portal inside the Sith cave.

By using the Force while positioned in front of the table inside the cave, Vader activated the castle as a burst of light in various shapes shot from the top of the tower and up through the sky. Although he successfully opened a portal through the Force, Vader's effort was interrupted by Captain Junus, commander of the castle's Imperial garrison who reported to the Sith Lord that they were under assault by a large army of Mustafarians. When Vader left the cave to inquire about the situation, Momin activated the castle and used its power to provoke a lightning strike on Vader outside. He soon opened the portal for himself and summoned his physical body, with the latter taking his mask back from the body he formerly used as a host.[1]

Upon noticing that Vader had joined the battle, Father Kkkt and two other Force-sensitive Mustafarians combined their strength to flood the battlefield with lava, killing both Imperial and Mustafarian combatants alike. As the sole Imperial survivor, Vader retreated to the castle while the remaining natives launched their final attack to destroy the dark fortress. Back inside the Sith cave, the Dark Lord activated the castle in order to erupt the lava in the area surrounding the fortress, and decimated the rest of the Mustafarian army.[13]

A portal through the ForceEdit

"This new design for the focusing chamber… It just feels right, doesn't it, Lord Vader?"
"Yes. The power here… This was its destiny. This is what it was waiting for."
―The Mask of Lord Momin and Darth Vader[src]
Sith cave portal

Darth Vader passes through the portal inside the Sith cave.

Momin subsequently revealed his resurrection to Vader, and the two Sith engaged in a lightsaber duel inside the cave. Although Momin claimed that the dark side would never allow Vader to reach the other side of the portal, and seemingly had the upper hand after cutting Vader's lightsaber-holding hand, Vader eventually overpowered and killed Momin by smashing him against the wall with one of the rectangular objects around the table. Having defeated all his enemies, Vader finally reopened the portal to resurrect Amidala.[13]

While the Sith Lord's body was left unconscious inside the cave, Vader's soul passed through the gateway. Afterward, Vader faced various figures and events from his past, and he also experienced brief visions of the future, such as his confrontation with his former Jedi Padawan, Ahsoka Tano,[15] at the Sith temple on the world of Malachor.[16] Although he had eventually reached a seemingly living version of his wife, he was not able to save her, as the apparition rejected him by disbelieving the survival of Anakin Skywalker, Vader's former self. Vader's vision was ultimately interrupted by the appearance of a distant figure wielding a blue lightsaber; that figure was in actuality Vader's son, Luke Skywalker, whose existence was unknown to the Sith Lord. As the Dark Lord regained his consciousness, he destroyed the gateway by stabbing the rock table with his lightsaber, and accepted that his wife's death could not be undone. The portal's destruction caused the lower ground in front of the castle to collapse, revealing other buried structures.[15]

Behind the scenesEdit

Backstory for Vader's castleEdit

"We don't see it all right now, but the idea was that Vader's castle was built over a natural cave—a Sith cave deep down below, in the lava world."
―Doug Chiang[src]
Vaders Castle FDKF

The Sith cave was created as part of the backstory for Darth Vader's castle.

The Sith cave was created as part of the backstory for Darth Vader's castle, which was designed for Rogue One: A Star Wars Story,[17] the first film in the Star Wars Anthology Series.[18] The cave was first mentioned in The Art of Rogue One: A Star Wars Story,[17] published on December 16, 2016, the same day as the film itself.[19] The Sith cave made its first canonical appearance in the comic book Darth Vader: Dark Lord of the Sith 5: The Chosen One, Part V, written by Charles Soule with art by Giuseppe Camuncoli,[2] and released by Marvel Comics on September 6, 2017.[20] The final story arc Fortress Vader of the Star Wars: Darth Vader: Dark Lord of the Sith comic-book series further explored the creation of Vader's castle.[11]

According to Doug Chiang, co-production designer for Rogue One,[18] the idea of a Sith cave beneath Darth Vader's castle originated from a piece of Ralph McQuarrie concept art of Emperor Palpatine's throne room created for the 1983 film Star Wars: Episode VI Return of the Jedi.[21] Chiang found the image of the throne on a lava lake inside a cave compelling and decided that the castle would be built on the foundation of an ancient structure. He intended to give the castle's final design an element of purpose, which was to draw energy from the lava lake much like a dam. Furthermore, Chiang thought that the castle could have a more ancient part below it, in the form of a natural cave where Vader went to meditate.[21]


"Let's just say it depends how deep you dig. And there's more to come."
―Pablo Hidalgo[src]
McQuarrie throne

Ralph McQuarrie's concept art of the Emperor's lair for Return of the Jedi was the inspiration behind the Sith cave.

Although the Databank entry for Darth Vader explicitly states that Vader's castle was built over an "ancient Sith cave,"[3] with the Star Wars: Darth Vader: Dark Lord of the Sith comic-book series later depicting the actual construction,[11] the 2016 reference book Star Wars: Rogue One: The Ultimate Visual Guide states that it was built over an "ancient castle full of dark secrets."[5] Although this is an ostensible continuity inconsistency, the Lucasfilm Story Group's Pablo Hidalgo, the book's author, clarified that "it depends how deep you dig."[22] Additionally, the 2017 reference book Star Wars: Absolutely Everything You Need to Know, Updated and Expanded also supports the aforementioned book's statement.[23]

The 2017 Star Wars: The Last Jedi: The Visual Dictionary establishes that Supreme Leader Snoke's ring featured obsidian from "catacombs" beneath Vader's castle,[24] while the 2018 Star Wars: The Complete Visual Dictionary, New Edition mentions that Vader's castle was once the site of a Sith temple.[6] When asked if the former actually refers to the Sith cave, the Lucasfilm Story Group's Matt Martin stated that was "a bigger question for another time."[25] The twenty-fifth and final issue of the Star Wars: Darth Vader: Dark Lord of the Sith comic-book series later revealed buried structures beneath the castle other than the Sith cave.[15] Additionally, LEGO's Darth Vader's castle set features an "ancient Sith shrine" with a Sith holocron beneath the castle,[26] as a reference to the Sith cave.[27]



Wookieepedia has 12 images related to Sith cave.

Notes and referencesEdit

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Darth Vader: Dark Lord of the Sith 23: Fortress Vader, Part V
  2. 2.0 2.1 2.2 2.3 2.4 Darth Vader: Dark Lord of the Sith 5: The Chosen One, Part V
  3. 3.0 3.1 3.2 StarWars-DatabankII Darth Vader in the Databank (backup link)
  4. 4.0 4.1 StarWars-DatabankII Mustafar in the Databank (backup link)
  5. 5.0 5.1 5.2 Star Wars: Rogue One: The Ultimate Visual Guide
  6. 6.0 6.1 Star Wars: The Complete Visual Dictionary, New Edition
  7. 7.0 7.1 Darth Vader: Dark Lord of the Sith 1: The Chosen One, Part I
  8. Star Wars: Galactic Atlas
  9. Darth Vader: Dark Lord of the Sith 4: The Chosen One, Part IV
  10. Star Wars: Episode III Revenge of the Sith
  11. 11.0 11.1 11.2 11.3 11.4 Darth Vader: Dark Lord of the Sith 21: Fortress Vader, Part III
  12. 12.0 12.1 12.2 12.3 12.4 12.5 Darth Vader: Dark Lord of the Sith 22: Fortress Vader, Part IV
  13. 13.0 13.1 13.2 Darth Vader: Dark Lord of the Sith 24: Fortress Vader, Part VI
  14. Pablo Hidalgo of the Lucasfilm Story Group states in SWCustom-2011 Rebels Recon: Inside "Ghosts of Geonosis" on (backup link) that Darth Vader had his castle "at least as long as the series [Star Wars Rebels]." The events of Star Wars Rebels: Spark of Rebellion, the series premiere, take place in the year 5 BBY, according to Star Wars: Galactic Atlas. Therefore, the castle's construction must have been completed by that date.
  15. 15.0 15.1 15.2 Darth Vader: Dark Lord of the Sith 25: Fortress Vader, Part VII
  16. Rebels-mini-logo Star Wars Rebels – "Twilight of the Apprentice"
  17. 17.0 17.1 The Art of Rogue One: A Star Wars Story
  18. 18.0 18.1 SWCustom-2011 Rogue One Details Revealed at Star Wars Celebration Anaheim on (backup link)
  19. SWCustom-2011 Rebel Reading: A Guide to Rogue One Books on (backup link)
  20. MarvelLogo Darth Vader (2017) #5 on Marvel Comics' official website (backup link)
  21. 21.0 21.1 SWCustom-2011 "We Set the Bar So High": Doug Chiang on Designing Rogue One on (backup link)
  22. TwitterLogo @pablohidalgo (Pablo Hidalgo) on Twitter "Let's just say it depends how deep you dig. And there's more to come." (screenshot)
  23. Star Wars: Absolutely Everything You Need to Know, Updated and Expanded
  24. Star Wars: The Last Jedi: The Visual Dictionary
  25. TwitterLogo @missingwords (Matt Martin) on Twitter "That's a bigger question for another time." (backup link) (screenshot)
  26. LEGO LEGO Star Wars Rogue One (Set: 75251 Darth Vader's Castle)
  27. TwitterLogo @missingwords (Matt Martin) on Twitter "Yeah." (backup link) (screenshot) (In response to "Is the ancient Sith shrine in LEGO Vader's castle a reference to the Sith cave beneath the actual castle?")

External linksEdit