The final terminal reveals that this entity is the rampant Forerunner AI Mendicant Bias, who had previously assisted in the Flood's attempt to destroy the Forerunners. In this transcript, as in the Terminals, 'L' stands for Librarian and 'D' stand for Didact.Īn unknown entity sends brief messages onscreen upon shutdown. On Easy, Normal, and Heroic difficulty levels, this second screen of text details a correspondence between two Forerunner lovers called the ' Librarian' and ' Didact'. After a short time, this text is overwritten and a new message is displayed on the screen. Upon initial access on all difficulty levels, the seven terminals give background details regarding the story of the 300-year-long Forerunner-Flood conflict, including strategies, encounters, enemy and friendly losses, and procedures leading up to the activation of the Halo Array. There is also a hidden terminal on Cortana, but that one does not need to be found in order to get the achievement. The terminals are located on three levels: The Ark, The Covenant, and Halo.

In co-op, all players must be near a terminal to access it.

If the achievement is not unlocked after accessing all terminals, try accessing all of the terminals on the same difficulty level.

For some players, the seventh terminal must be accessed last in order to unlock the achievement.

If the arrow is still green then wait until the terminal proceeds. However, in some cases this may take time. Note that normally the player is able to advance each screen of the display by pressing the A button. When it turns red the player can exit the terminal.

There is a green arrow in the bottom left-hand corner.

If there is no red arrow (see below) then wait until the red flash/scanning occurs. On some terminals, it may be necessary to wait until the screen flashes red and the screen appears to 'scan horizontally'.

It is necessary to read the text until the green arrow (facing left) turns red.

In either single-player or cooperative mode.

IMPORTANT: The terminals must be accessed as follows:

The player does not need to finish any of the missions in question in order to unlock the achievement. Finding and accessing all seven of the terminals in Halo 3 unlocks the Marathon Man achievement this can be done over the course of several sessions, out of order, and on various difficulties. The terminals can be accessed on any difficulty.

Halo 1 terminals