Activate all seven Terminals in Halo 3's campaign to reveal campaign backstory narrated by the Gravemind and unlock lore about the Forerunners and Flood.
Terminals are interactive lore objects hidden throughout the campaign. Activating them reveals snippets of backstory, often narrated by the Gravemind or other key characters, providing deeper insights into the Halo universe, the Forerunners, and the Flood. There are a total of seven Terminals to find, each offering a piece of the larger narrative puzzle. Locating all of them not only grants an achievement but also enriches the overall story experience for lore enthusiasts.

- Terminal 1: Found in The Ark.
- Terminal 2: Found in The Ark.
- Terminal 3: Found in The Covenant.
- Terminal 4: Found in The Covenant.
- Terminal 5: Found in The Covenant.
- Terminal 6: Found in Cortana.
- Terminal 7: Found in Halo.
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