- last post: 01.01.0001 12:00 AM PDT
The Master Chief had to leave Cortana on High Charity which is now controlled by the Flood, forget Covenant AI, Gravemind probably eliminated them or has control over them now and since Cortana is a Human AI he has corrupted her to get all the information about humanity. I can picture it now, the Chief goes aboard the Flood infested High Charity to rescue Cortana. You thought the Library was bad, just wait till that level.