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|“|| It is fundamental to our cause, the key to Ascension, for it holds power and wisdom far beyond anything ever before imagined by Man.|
The Tacitus (Latin, silent) is an ancient and extraterrestrial data matrix that played a prominent role during the Tiberium Wars between GDI and Nod. Both factions used the Tacitus' data to improve their technology and understanding of Tiberium and control of the device was highly sought after. It formed the basis of the Brotherhood's ideology.
Tratos the Translator
|“|| You're only delaying the inevitable. I have the Tacitus. I am invincible. The Tacitus told me of Tiberium missiles, of invulnerable flying ships, of real-time genetic mutation. More than alien. More than human! The next step in our evolution as a species!|
The Forgotten acquired the Tacitus prior to the Second Tiberium War and their leader, Tratos, learned to translate it. The mutants hoped to find some way to reverse their mutations. Tratos and the device ultimately fell into Nod hands. Kane tricked the Forgotten leader into aiding CABAL translate the device for Nod's designs. Tratos later regretted cooperating with Nod; he realized too late the translated data was being used to create Tiberium weapons, lifeforms, all aimed toward Nod's final goal of creating a Tiberium world. GDI initially refused to believe the existence of the device despite gaining the Forgotten as allies. Any remaining doubts about its existence were dispelled at the end of the war when GDI recovered the device from the Nod Pyramid in Cairo. GDI regarded information regarding the Tacitus as highly classified.
|The following is based on the Nod campaign for Tiberian Sun and some details might contradict canon.|
|“|| The Tacitus is the source, Slavik. Its Tiberium secrets can make or break empires. Find it.|
- Kane to Anton Slavik.
After his public return Kane ordered Commander Anton Slavik to deliver a Nod high-technology ship to Cairo. The ship held the Tacitus and other technologies useful to Nod and was stored in a subterranean hangar. However, General Vega reached the hangar first and took the ship for a personal endeavour in South America. However, Vega was unable to control it and the ship crashed. Slavik arrived to find the ship abandoned and the Tacitus missing.
Restoring the Tacitus
- Main article: Firestorm Crisis
Although the war was won by GDI, Tiberium contamination was reaching critical levels. The Daedalus Team believed the Tacitus to be the best approach to acquiring the necessary knowledge to fight Tiberium. The device and Kane's accumulated notes and data were scheduled to be shipped immediately to the Daedalus Research Complex where Tratos could continue translation. The Tacitus was loaded onto Kodiak at Cairo but the ship was destroyed by an ion storm in flight. This coincided with the beginning of the Firestorm Crisis. As one of its first duties, General Paul Cortez ordered the emergency Firestorm Taskforce to recover the Tacitus. GDI did not locate Kane's store of translated data.
Tratos was assassinated by Nod on CABAL's orders before receiving the Tacitus and translation proceeded slowly. Doctor Gabriella Boudreau estimated Tratos' death put the project years behind schedule, when it was estimated the atmosphere would be toxic to humans within a year. The doctor proposed to use CABAL as a substitute translator; the Nod AI helped Tratos translate the Tacitus for Kane.
The Firestorm Taskforce captured CABAL core in Poland. This was to the AI's design. It knew translation efforts were crippled because the device was physically incomplete. Nod had failed to retrieve the missing segment and it hoped GDI would be more successful. CABAL convinced GDI to retrieve the missing segment after revealing the nature of the problem. The AI even pinpointed the segment's location in northern Bolivia for the Firestorm Taskforce. The segment was sequestered in a complex of ancient step pyramids occupied by a small religious group. A GDI archaeologist deciphered the pyramid hieroglyphs to determine which one the segment was stored in. CABAL took the completed device and unleashed its cyborgs on GDI.
Ironically, the Tacitus was, in turn, stolen from CABAL by the Forgotten. The AI used Nod forces to recover the device for it. The Brotherhood's Inner Circle grew increasingly uneasy with the AI's independence, including its unilateral recovery of the Tacitus and assassination of Tratos. CABAL finally broke with Nod when the Inner Circle threatened to deactivate it.
The Tacitus was retrieved by GDI from a CABAL core at the end of the Firestorm Crisis. While Doctor Boudreau made a series of breakthroughs on the whole GDI continued to struggle with interfacing with the Tacitus and data recovery remained slow.
Signs and Portents
In the interwar period, further GDI Tacitus research uncovered references to the Scrin and their future invasion. Unbeknownst to GDI the Scrin were a key factor in Kane's strategy for the Third Tiberium War.
Third Tiberium War
- Main article: Third Tiberium War
Tacitus translation was the responsibility of GDI InOps when the Scrin invaded Earth. They noted the structure of Scrin data transmissions was patterned on the data structure found in the Tacitus, but were significantly different such that it was unlikely the Scrin were the exact originators of the device. Decryption programs similar to those found in the Tacitus were used to interface with and capture Annihilator Tripods.
Nod located the Tacitus in China as GDI prepared to transport it away by sea. On Kane's behest, LEGION intercepted and captured the land convoy carrying the device. The AI was maliciously shut down by Abbess Alexa Kovacs before it could interface with the Tacitus. 
The Key to Ascension
|“|| LEGION, I address you and you alone first. Know that you are more than a mere neural network. Your design is drawn from the Tacitus itself. You are connected to the artifact, now know this. As the Visitors towers near completion, the Tacitus has begun to transmit a signal. A signal only you can receive. You must find it, liberate it! The Tacitus is the key to Ascension... and beyond!|
- Kane to LEGION.
|“|| They are like children playing with a nuclear weapon! They have no idea what they have, no idea of its power! Their experiments have rendered the Tacitus dangerously unstable, do you see how the signal is fluctuating?! If we are to secure the artifact, we must move quickly, before we lose it forever!|
- Kane to LEGION
GDI recaptured the Tacitus a year later in 2051 and shipped it to a fortified facility in the Rocky Mountains. The device's condition was deteriorating and the probability of destroying it increased with every test. Kane was disturbed by the development, and feared GDI may have damaged it beyond repair, but chose to wait until LEGION reactivated in 2052. Nod was much reduced as a result of the Third Tiberium War. The forces needed to assault the Tacitus facility was found in the Marked of Kane. LEGION recovered the Tacitus and interfaced with it.
Kane showed the Tacitus to GDI in 2062. Presumably interfacing with LEGION stabilised the device, since Kane could publicly display it without fear. The advanced knowledge of the Tacitus was later used to create both the Tiberium Control Network and Optical implants.
Command & Conquer 3: Tiberium Wars claimed GDI confiscated the Tacitus from Nod in 2028. According to Command & Conquer: Tiberian Sun the Second Tiberium War occurred in 2030 and during which GDI claimed to have no knowledge of the device - Even taking steps to deny its existence when presented with the concept of such a piece of technology. To quote General Solomon, in Tiberian Sun, "The Tacitus is nothing but a shiner myth!" - To Umagon, when she claims that Kane has the Tacitus (Which, ironically, he does).
Behind the Scenes
Westwood Studios originally developed two origins for the device.
|“|| We had also developed two completely different origins for the Tacitus, and since both stories leveraged that origin, I'm trying to remember what each included. One was centered around the Tacitus being a soul-prison for the leader of the martian force that fought against the Scrin (they knew how to beat the Scrin, but discovered it too late) while the Earth was still primordial, and the other was centered around the Scrin rebels stealing the "bible" of the Scrin -- which may or may not have been written by them in the first place -- and the Scrin Primal's crusade to recover it.
Both were interesting and had some cool reveals.