The Weapon

"The Weapon" is the moniker of an artificial intelligence, she has the serial number of CTN 0453-0. She was created to enter an installation to imitate Cortana and lock her down for retrieval. The Weapon is actually an exact copy of Cortana herself, with all of the same routines and systems but with any information that could compromise her removed.

Creation and Terminating Cortana
Sometime after the Created uprising in late 2558, "The Weapon" was created to enter an installation to imitate Cortana and lock her down for retrieval. She is an exact copy of Cortana herself created by Dr. Catherine Halsey with any information that could compromise the Weapon removed by Halsey. According to John-117, she is basically Cortana if she and the Master Chief had never met.

After her creation, she is partnered with John-117, so he could take Cortana to the for termination, and, upon The Weapon's successful deployment, her deletion routine would execute. However, the routine failed to activate, causing her mission parameters to change to ascertain why she was not terminated.

Zeta Halo conflict
Six months after the defeat of Cortana, the Master Chief returns for the Weapon who accompanies him across the ring. Recovering the framework that the Weapon had used to lock down Cortana, the two witness echoes of Cortana's life, causing the Weapon to eventually discover her true nature as a copy of Cortana. The Weapon tries to self-delete once again, but she is stopped by the Master Chief who admits that while he doesn't trust the AI completely, he wants to. The two learn from the echoes that Cortana had sacrificed herself to destroy part of the ring and that it was Cortana herself who had stopped the Weapon's deletion, knowing that her best friend would need the other AI.

After the defeat of the Harbinger, the two witness a final message recorded for the Master Chief by Cortana who apologizes for her actions and hopes that the two learn from her mistakes and become better for them. Cortana also tells the Master Chief that the Weapon has a lot of potential. After reuniting with Echo 216's pilot, the two learn his real name and the Master Chief offers to let the Weapon choose her own name, much like Halsey had done for Cortana. The Weapon informs her companions that she has the perfect name for herself.

Personality and traits
The Weapon has a sunny and naive personality due to her young age and lack of experience. However, she shares some traits with Cortana such as often snapping her fingers when performing an action. After discovering her true origin, the Weapon is horrified because of the terrible things that Cortana, who is essentially her, has done and she tries to delete herself. However, the Chief stops her, stating that while he doesn't trust her, he wants to, recognizing the differences between Cortana and her copy. Cortana herself notes that the Weapon has a lot of potential and that she makes a great replacement as the Master Chief's AI companion.

List of appearances

 * Halo Infinite