When Cortana was with the Master Chief to destroy the Mantle's Approach by using a HAVOK Tactical Nuclear Weapon, she sacrificed herself to save Master Chief. The Mantle's Approach tried to jump into a slipstream to avoid destruction and Cortana soon discovered the Domain. She found out that her rampancy could be cured by being in the Domain. This in turn woke the Warden Eternal who was convinced she was could be a Reclaimer.
Cortana and the Warden Eternal soon started activating the Guardians on a lot of planets to be able to enforce peace throughout the galaxy.
During that time, Cortana convinced a lot of other AI to join her cause. After the Guardians were awoken, Cortana and the Warden Eternal went to the Unggoy home planet of Balaho, where most of the Unggoy joined the Created.
- Cortana, UNSC AI normally working together with John-117
- Sloan, governor of Meridian and an administrative AI
- Lycus, a ship AI
- Jiang, colonial authority AI on Erdenet
- Cromwell, the ship AI of the UNSC Melbourne's Pride
- Unggoy, most of the Unggoy on Balaho joined the Created when Cortana brought nearly limitless resources to their planet, granting them ships, food, shelter and medicine.