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The Forerunner caste system was a system used to rank Forerunners in society.

Each caste 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.

Known castes

 * Builder
 * Miner
 * Lifeworker
 * Warrior
 * Warrior-Servant

List of appearances

 * Halo: Cryptum