From Halopedia, the Halo wiki
Logician was the title of a Forerunner individual. The Huragok Prone to Drift mentioned the Logician as an example of a Forerunner known by their title alongside the Librarian, the Master Builder, the Esthetist and the Didact when explaining the Forerunners' naming conventions to Jul 'Mdama, held captive by ONI on Trevelyan at the time.
List of appearances
- Halo: The Thursday War (First mentioned)
- Halo: The Thursday War, page 246