- "This is the lair of General Grievous!"
- ―Kit Fisto
Grievous's fortress 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.
Following Viceroy Nute Gunray's rescue by Count Dooku's assassin Ventress and traitor 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.
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 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 Greivous 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. Unfortunately, Grievous then shot and killed Vebb and taunted Fisto, telling him that he was next.
- Star Wars: The Clone Wars – "Rookies" (First appearance) (Appears in flashback(s))
- Star Wars: The Clone Wars – "Lair of Grievous"
- Age of Republic - General Grievous 1 (Appears in flashback(s))
- Ultimate Star Wars (First identified as Grievous's fortress)
- Star Wars: Absolutely Everything You Need to Know
- Star Wars: The Visual Encyclopedia
- Star Wars: Absolutely Everything You Need to Know, Updated and Expanded