During the their big date towards the Ascendant Fairness, Cortana demonstrated uncharacteristic behavior in addition to anger, distraction, and you can mind-question – an indicator you to definitely she pancy
Cortana and you can John-117, relatively the only survivors of your own Pillar out-of Trip ‘ s crew pursuing the Race of Setting up 04, discovered a small number of most other UNSC personnel which had fled brand new ring-in good Pelican dropship. Realizing that the Pelican wasn’t with the capacity of traveling enough time distances, John-117, as well as Cortana together with Pelican’s four-child crew, fought their ways on the Covenant leading Ascendant Fairness. She were able to improve toward ship’s weapons and Slipspace prospective, able to upload it so you 
can white rates less than Threshold’s environment. She after that came back the latest survivors to-arrive, the spot where the group helped in order to cut survivors of your Raid regarding Come to, including the woman “mom,” Dr. Halsey.
Cortana indicated that she got drawn numerous studies off Halo, together with sheer quantity of advice cut on their running fuel and you may slowed their off. Dr. Halsey deleted specific studies off the girl memory to provide this lady so much more considering space, including studies of Sergeant Johnson’s immunity system with the Ton – due to Boren’s Disorder.
It actually was also revealed that during Cortana’s time on Ascendant Justice, she got caught an excellent Covenant AI, decompiled brand new AI and you may copied a couple of its services: the ability to convert Covenant speech, as well as the capacity to manage imperfect clones out-of in itself. Such prospective, together with her personal understanding of this new Halos, produced this lady extremely valuable into the UNSC.
Ascendant Justice are efficiently fused having UNSC Gettysburg. It was yet you to definitely Cortana read out of a planned Covenant assault on the planet. John-117, as well as SPARTAN Blue Group and you will an enthusiastic expendable duplicate from Cortana (challenging data the genuine Cortana had she try just also valuable in order to chance), carry out afterwards execute Process: First strike.
Because ended up, the newest Covenant AI you to definitely Cortana got decompiled had was able to, prior to its just take, send an email across the Covenant Battlenet, caution this new Covenant of the ship’s bring and sending the necessary calculations to have a sub-atmospheric Slipspace diving. The information are later employed by the fresh Prophet away from Be sorry for in order to enter Slipspace best a lot more than The latest Mombasa inside the Race from Mombasa.
John-117 and Cortana create after come back to Planet, at which section Cortana handed most of the sensitive analysis for the the lady hands over to ONI, no matter if she held on the Directory and you may seem to however possessed specific studies on the Halo community plus important information about the new Ark.
Battle out of Planet
Immediately after back again to World, Cortana served to the Orbital Protection System Cairo, in which a ceremony both for SGT Johnson, John-117 and you may CDR Miranda Keyes are in the future disrupted by the coming regarding an effective Covenant Fleet within the command of your own Large Prophet from Feel dissapointed about, carrying out the battle of Planet. Cortana obtained command over the Cairo ‘ s Magnetized Accelerator Cannon in order to repel this new invaders, along with John-117’s let, she effortlessly deactivated good Covenant bomb who would has shed the new route. She performed so it by publishing to John-117’s armour once again the very first time due to the fact capture out of Ascendant Justice. Whenever she did it, she in some way was able to exercise courtesy him simply holding the latest terminal their hologram is to your, perhaps an improvement as a result of John-117’s the latest e bomb ended up being used by SPARTAN-117 to help you wreck a beneficial Covenant Physical violence Service provider. John provided for her to remain behind to the route after she said that their bundle are crazy, however, she decided to match your anyway. [16] She next assisted him when he arrived in New Mombasa so you can deal with an effective Scarab. [17]