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The Forerunner caste system was a system used to rank Forerunners in society.
Adolescent Forerunners, known as Manipulars, were not associated with any particular caste. However, upon maturing, each individual Forerunner would be assigned to a rate, mostly in accordance with the rate of their parents. For example, Bornstellar-Makes-Eternal-Lasting was expected to become a Builder like his father.
Each rate had their own ceremonial headgear, worn only on special occasions. However, on a certain day in the Grand Star Season, every Forerunner wore the same style.
- Halo: Cryptum (First appearance)
- Halo: Primordium
- Halo: Combat Evolved Anniversary
- Halo: The Thursday War (Mentioned only)
- Halo 4
- Halo: Silentium