Bungie brought us Master Chief+Cortana (of course), Sargent Johnson, The Arbiter, GuiltySpark, the Prophets, (Humanity was super fucked when Halo 1 starts). 11 Cortana Tricks for a Master Chief. Cortana will ask you about a subject and what to say in the message; the note is sent via the Windows 10 Mail app. Cortana's last moments with the Master Chief. John and Cortana chased the Didact to Earth in a Broadsword and, with the help of the Infinity.