Shortly after on Predecessor planet Genesis, the new Warden Eternal noticed she was able to support new Mantle out-of Duty, and you can vowed to guard and you may suffice less than the lady, giving the girl complete operation of systems into the secure globe on package you to definitely she had planned. The latest Warden Endless try concerned with the lady dependence on John-117, alerting her he perform just be sure to stop what she got at heart, however, she dismissed his worries, convinced that he’d never do nothing.
Devoid of people leads in these incidents, the UNSC did not understand how to work, up until Dr. Catherine Halsey called Captain Lasky, giving your her place and you can saying she know the thing that was going on on the nest planets. About three days after, Fireteam Osiris was deployed on the planet Kamchatka to help you stage an effective save your self operation, and you may are ultimately effective. 
Halsey, John-117 is called from the Cortana into the Raid for the UNSC Argent Moon. Bluish Team create chase Cortana with the Nest world of Meridian.  Cortana hit a take on Meridian’s governor, a partial-widespread AI named Sloan – people off Meridian will be considering the chance to evacuate, and you will Sloan himself considering accessibility brand new Website name and the lose having rampancy, in return for enabling Blue Team unfettered accessibility the fresh exploit from the Apogee Station together with Guardian housed therein. Despite the tried input off Fireteam Osiris, Cortana were able to utilize the Meridian Guardian to carry John-117 and the remainder of Bluish Party to Genesis, where she shown their obvious solution to rampancy along with her package to utilize new Guardians in order to impose a purple Comfort and follow the brand new Mantle away from Obligation on the Composed.
Fireteam Osiris, believing that new Guardians you will cause them to John-117 and you may Cortana, was indeed in the future told of an inactive Protector on the Sanghelios, protecting Thel ‘Vadam away from an assassination shot. Thel ‘Vadam read out of Locke’s purpose to get John-117, where Cortana disrupted and you may reported that they’d never ever discover them. Aware of the newest Guardian sleeping on earth, Fireteam Osiris was able to to get a good Constructor one to stalled this new Protector for a lengthy period so you’re able to board they, regardless of the Warden Endless intervening again.
Reading out-of Cortana’s preparations, John-117 approved you to definitely she had to be avoided, however, expected that he would be capable reason together. Cortana are agitated by the Warden’s lingering attempts to harm John, eventually banishing him temporarily right down to his actions. She then manifested by herself to see John once again, which attempted to persuade the girl to get rid of. Cortana is actually upset, but just trusting your become mistaken, throughout the Cryptum to have ten thousand ages to exhibit your her really works immediately after she try done.
Watching Fireteam Osiris chronic toward releasing John-117, Cortana taunted the team and you may sent Prometheans to eliminate her or him. But not, Locke were able to ruin the final relay, making it possible for 031 Lush Experience in order to regain power over Genesis’ solutions. When you look at the a work away from payback to possess Cortana delivering the woman setting up out, Lush Witness took the brand new Cryptum property John-117 and you will Blue Party, much so you’re able to Cortana’s horror as the her Protector went into slipspace.
Embittered from the death of John-117, Cortana began this lady Reclamation, and you may managed to discover UNSC Infinity. But not, it did an urgent situation slipspace diving in advance of the lady Guardian you are going to disable they.
During the lady address to your species of the newest market, the new Unggoy regarding Bahalo made a decision to get in on the Written. Enjoying this, Cortana delivered ships laden up with advanced technology, farming service stations, dinner, medicine and you can protection towards the entire world.