- "This is the lair of General Grievous!"
- ―Kit Fisto
Grievous's fortress, also known as Grievous's castle, was the personal hideout of the cyborg General Grievous, located on the third moon of Vassek. The castle was specifically designed to fit the needs of the General, with a multitude of spare parts on hand as well as full medical facilities. In Grievous's absence, it was inhabited only by medical droid EV-A4-D, Grievous's pet roggwart Gor and a number of MagnaGuards who protected the lair. It also had a collection of traps for "uninvited guests". Grievous also kept lightsabers of Jedi such as Neebo at his fortress.
Located on the third moon of the planet Vassek, among a tangle of sharp, towering mountains, plunging gorges and tall columns, and at the end of a canyon was a cliff face which hid the castle of General Grievous. Grievous's fortress was a secret citadel littered with deadly traps for anyone who entered, and it was where the Kaleesh cyborg kept his spare parts, along with his own personal droid doctor and pet, the Roggwart Gor. Beyond the general's gloomy trophy room illuminated tables showcased Padawan braided and Lightsaber hilts taken from the victims of the deadly cyborg.
Three main access points led into the fortress. The main entrance sat at the end of an approach along a gorge, where there was a large, ornate doorway in a triangular arch, and resembled a giant spearhead. It was deliberately made imposing and intimidating, and was surrounded with glowering red lights to add to the effect. Around the rear was a second, similar entrance. Both access points were designed so that anyone approaching would assume that the doors would open entirely, but were sealed against any such encroachment. At both sides of the castle, the real way in were much smaller doors at ground level, which were built into the larger whole, like postern gates. They could only be opened by triggering a section of the ornamental detail that was all-but indistinguishable from the rest of the design. There was also a small landing pad located at the rear, where the third entry point was a big circular hatch large enough to accomodate Grievous's personal Belbullab-22 heavy starfighter, Soulless One.
Within the fortress, was a long, stone-flagged corridor, as well as intricate pipework along the ornate walls, which held light globes that casted confusing shadows throughout the passageway and made it difficult to locate doorways in the darkness. At the end of the corridor was an arch that led into a "sanctum overlook," where a walkway led over a plunging fall. A single throne-like seat, complete with a communications panel dominated the room. In one room of the fortress, was a trap door that, when opened, plunged down into a circular pit of lava, and each corridor was surveyed by several TT-8L/Y7 gatekeeper droids, which were monitored from a control room inside the fortress behind a secret door. The castle was also guarded by several IG-100 MagnaGuards, each of which possessed a ceiling-hung rack for recharge outside the control room.
Following Viceroy Nute Gunray's rescue by Count Dooku's assassin Asajj Ventress and traitor Faro Argyus, Dooku decided to lead them to Grievous's fortress. There, they left their ship's homing beacon at the fortress. Dooku then remotely deactivated the MagnaGuards stationed there, to allow the Jedi to find him and to test Grievous's abilities to kill Jedi.
The Republic soon followed beacon's signal. Jedi Knight Nahdar Vebb and his clone troopers arrived, and they were then joined by Vebb's former master, Kit Fisto and his droid, R6-H5 in their starfighter. Fisto then found the entrance to the fortress. They went inside, where they found a group of B1-series battle droids defending Gunray. After destroying the battle droids, Fisto, Vebb, and their men realized that it was only Gunray's hologram and that they were only following the beacon. Dooku then appeared, offering Fisto and Vebb an alternative prize. They then made their way through the fortress, coming across statues of a strange warrior. They then found a chamber filled with Grievous's Kaleesh masks.
Grievous was then detected by R6, "Niner", and "Bel" in his starfighter, the Soulless One, approaching the fortress unaware of them. After landing, Grievous looked for Gor. He was then confronted by Fisto, Vebb and their troopers. However, Grievous was able to kill several of the troopers and make his way towards the control room. Grievous then spoke with his medical droid, EV-A4-D, who told him that his guards were remotely deactivated. Grievous then activated his guards, locked down the fortress, and then activated a trap that killed another clone. Fisto then disabled one of Grievous's security cameras. Grievous then unleashed his pet Roggwart, Gor upon the Jedi and Commander Fil. EV-A4-D then began to repair Grievous. The Doctor then repaired Grievous's legs and stated that he sometimes wondered why Grievous had submitted to his changes. Grievous angrily told EV-A4-D that his cybernetics were improvements that he had chosen, and he said that he submitted to no one. His mask was removed from his face, and he would soon be fully repaired.
After his repairs Grievous was then contacted by Dooku, who revealed that he set up Grievous in order to test skill against a Jedi Master and knight. After ending his conversation, Grievous and his guards then left the control room to kill the two Jedi. Fisto and Vebb then attempted to enter the control room, but were spotted by the Doctor, who alerted Grievous. Fisto was then separated from Vebb and Vebb was forced to fight Grievous and his guards on his own. Fisto then spliced the Doctor's head off. Fisto then watched as Vebb fought Grievous and his guards. Grievous then shot and killed Vebb and taunted Fisto, telling him that he was next.
- Star Wars: The Clone Wars – "Rookies" (First appearance) (In flashback(s))
- Star Wars: The Clone Wars – "Lair of Grievous"
- Age of Republic - General Grievous 1 (In flashback(s))
- Ultimate Star Wars (First identified as Grievous's fortress)
- Star Wars: Absolutely Everything You Need to Know
- Star Wars Helmet Collection 18 (Databank A-Z: First Order–Fyrnocks)
- Star Wars Helmet Collection 21 (Databank A-Z: Greedo–Gundarks)
- Star Wars Helmet Collection 24 (Weapons & Uniforms: Terror of the IG-100s)
- Star Wars: Build the Millennium Falcon 65 (Guide to the Galaxy: Visiting Vassek 3) (First identified as Grievous's castle)
- Star Wars: The Visual Encyclopedia
- Star Wars: Absolutely Everything You Need to Know, Updated and Expanded
- Star Wars Helmet Collection 30 (Databank A-Z: Tee Watt Kaa–Kamino)
- Star Wars: Build Your Own R2-D2 57 (Droid Directory: IG-100 MagnaGuard)
- Star Wars Helmet Collection 57 (Databank A-Z: Trident Assault Ship–Turbolasers)
- Star Wars Helmet Collection 65 (Databank A-Z: VCX-100 Light Freighter–Veers)
- Rise of the Separatists
- Star Wars: The Clone Wars: Character Encyclopedia - Join the Battle!
- "Scarif and Other Outer Rim Planets" – Star Wars Encyclopedia
- "Mace Windu and Other Force Users" – Star Wars Encyclopedia