Originally a smart AI made from a clone of Dr. Halsey's brain and supporting John-117 in the ending battles of the Human-Covenant War, Cortana is now possibly the most dangerous threat to the UNSC and humanity.
HOMEWORLD: Reach, Epsilon Eridani system
BORN: November 7th, 2549
DIED: N/A
SERVICE RECORD
Cortana is a smart AI developed by Doctor Catherine Halsey on Reach from a clone of her own brain in 2549. She served as the shipboard AI on the UNSC Pillar of Autumn during and following the Fall of Reach, though is best known as the AI that served with John-117 during the final battles of the Human-Covenant War. Due to her vast intelligence, Cortana was able to help John defeat the Flood at Installation 04, assisted in the Battle for Earth, and fought a battle of wits with the Gravemind aboard High Charity during the Battle of Installation 05. After she and John were lost aboard the UNSC Forward Unto Dawn following the Battle of Installation 00, she remained alone for over four years while the ship drifted and John remained in cryo-sleep. Upon John's revival above Requiem, Cortana assisted him with fighting the Ur-Didact, despite feeling the effects of rampancy, and sacrificed herself to protect humanity and John. Part of her survived, however, and ended up on Genesis, where she came into contact with the Domain and gained access to much of the Forerunner technology in the galaxy. While her motivations are unclear, Cortana used the power of the Domain to take control of many Forerunner sites, subjugating the known galaxy under her rule, and beginning the Rule of the Created. Though it is not proven, it is thought that Cortana's sudden change in allegiances against the UNSC was in part due to her rampancy, coupled with her exposure to the Gravemind.
The Fall of Reach was possibly the largest battle during the Human-Covenant War, taking place in the Epsilon Eridani system, in orbit and on the ground of Reach, humanity's largest military stronghold.
The Battle of Installation 04 was an engagement between the UNSC Pillar of Autumn and the Covenant Fleet of Particular Justice on and around the Forerunner megastructure known as Installation 04, or Alpha Halo, in the Soell system.
The Battle for Earth was a large-scale space, air, and ground battle between the invading Covenant forces and the UNSC Home Fleet on and around Earth at the end of 2552.
The Battle of Installation 05 was an engagement between the Covenant forces, including those that fled the Battle for Earth, High Charity, and the Second Fleet of Homogeneous Clarity, and the UNSC-allied forces, including the UNSC In Amber Clad led by Miranda Keyes, and the Fleet of Retribution led by the Arbiter Thel 'Vadam.
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REFERENCE BOOKS
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