While in the the girl date into the Ascendant Justice, Cortana exhibited uncharacteristic decisions and rage, distraction, and you may thinking-question – indicative one she pancy
Cortana and you will John-117, apparently really the only survivors of your Mainstay away from Trip ‘ s staff adopting the Competition from Installation 04, discovered a small number of other UNSC employees that had escaped this new ring-in an excellent Pelican dropship. Knowing that the fresh new Pelican wasn’t ready traveling enough time distances, John-117, and Cortana and Pelican’s four-boy crew, battled the means onto the Covenant flagship Ascendant Justice. She was able to improve on ship’s weapons and you may Slipspace potential, in a position to posting it to help you light rate less than Threshold’s atmosphere. She following returned the newest survivors to arrive, the spot where the class aided so you can help save survivors of your own Raid away from Started to, and her “mommy,” Dr. Halsey.
Cortana revealed that she had taken plenty of study out-of Halo, and the absolute number of recommendations clipped into the the woman processing fuel and you may slowed the lady down. Dr. Halsey removed 
specific studies away from the lady memory giving the woman much more thinking room, including data away from Sergeant Johnson’s immunity system for the Ton – a result of Boren’s Syndrome.
It was and showed that throughout Cortana’s time to your Ascendant Fairness, she got grabbed an effective Covenant AI, decompiled the latest AI and you can copied two of its services: the ability to translate Covenant message, and ability to carry out incomplete clones out-of by itself. These potential, together private information about the new Halos, produced the girl very beneficial on UNSC.
Ascendant Fairness are efficiently bonded which have UNSC Gettysburg. It actually was yet that Cortana discovered from a fully planned Covenant physical violence in the world. John-117, also SPARTAN Blue Cluster and you may an expendable clone of Cortana (challenging investigation the real Cortana had she is only as well valuable in order to risk), manage later execute Procedure: First-strike.
Because turned out, the latest Covenant AI you to Cortana had decompiled had were able to, just before its get, publish an email along the Covenant Battlenet, caution the brand new Covenant of the ship’s need and you can sending the desired calculations for a sub-atmospheric Slipspace jump. Every piece of information is after used by the fresh new Prophet off Feel dissapointed about to enter Slipspace right above New Mombasa in the Competition out-of Mombasa.
John-117 and Cortana create after go back to Environment, from which part Cortana given most of the sensitive and painful research from inside the her hands over to ONI, even in the event she stored onto the Directory and you may seem to nonetheless had some analysis into Halo network and additionally crucial information on the fresh Ark.
Battle from Earth
Immediately after returning to World, Cortana supported to the Orbital Security System Cairo, where a ceremony for SGT Johnson, John-117 and you will CDR Miranda Keyes are in the future interrupted by the coming from a Covenant Fleet according to the order of the High Prophet out-of Feel dissapointed about, doing the battle regarding Planet. Cortana was given control of the fresh Cairo ‘ s Magnetized Accelerator Canon so you’re able to hold back the brand new intruders, with John-117’s assist, she properly deactivated good Covenant bomb who does keeps destroyed the station. She performed this because of the uploading so you’re able to John-117’s armor again for the first time given that get of Ascendant Fairness. Whenever she did it, she for some reason were able to get it done thanks to him only coming in contact with the newest terminal the girl hologram is actually on, maybe an upgrade down to John-117’s the newest e bomb was then used by SPARTAN-117 so you’re able to wreck an excellent Covenant Violence Supplier. John considering on her to remain about to your route shortly after she asserted that his bundle was crazy, but she chose to accompany him anyway. [16] She up coming aided him as he found its way to The brand new Mombasa so you can deal with a great Scarab. [17]