First off, this topic is in regards to the ending of Halo 4’s campaign so there WILL be spoilers. If you are still yet to complete the campaign, avoid reading any further.
At the end of the game, we are led to believe that Cortana splits her rampant self into fragments, and uses these fragments against the Didact. However, I think I have an alternate view on this which could answer the question of ‘Is Cortana gone for good?’
About mid-way through the campaign, Cortana is briefly taken away from the chief by the Librarian, who then speaks to the Chief and tells him about the Didact and the composer. In the very brief time that the Librarian borrowed Cortana for, it’s highly possible that she saved backup copies of the Cortana AI model. Picture it as copying the file Cortana.AI from a USB drive and pasting it into the Forerunner mainframe. It’s highly possible that she saved hundreds, if not thousands of backup copies. After all, Cortana is something pretty special.
Now, you might think, how can a forerunner data system read/understand a human AI?Well, the thing is… Cortana isn’t entirely human in origin. If you played Halo Reach, you’ll know that the Cortana AI model was based off of forerunner technology that was recovered from an artefact beneath Sword Base.
Back to the ending of Halo 4…
While Cortana claims to be fragmenting herself into many different parts, she may well have been lying. She knew what the Librarian did, and tapped into the system to call upon the clone copies of herself. She then used these to help Chief defeat the Didact. This leaves a few new questions…
Why did the Librarian make copies of Cortana?
Aside from the fact that Cortana is unique and cool, I don’t really know. It’s possible that she had foreseen what would happen, or she was just being careful.
Why would Cortana lie to Chief?
Again, this is a hard one to explain. But it’s possibly got something to do with helping Chief realise his humanity.
What happened to the real Cortana?
This is what I’m interested to know. Was the Cortana that spoke to chief inside the tech-box in the final cutscene a clone? It could well have been. And that means that Cortana is still out there somewhere…
Please discuss this theory, point out flaws, and maybe help answer the unanswered questions.