8th Terminal on the Level Cortana

The Eighth Terminal is located on the level Cortana. Although it does not go towards theMarathon Man achievement. This terminal can be found on the basement floor of the room with the Tilt Skull in it. At the very bottom of this room, there is a Gravity Hammer leaning against a stand. This stand is a Terminal. This does not actually look like a terminal compared to the other terminals in the game instead it looks like a pedestal of light.

Upon activating the terminal. Cortana will take over your HUD with a message, which turns out to be a reference to the novel The Fall of Reach.