All known rates of Forerunner society.
“The Builders were a caste in Forerunner society who were considered to be the most powerful in...Builder
“Lifeworkers were one of the main castes in Forerunner society. They specialized in medicine and...Lifeworker
“Mutation was a Forerunner term referring to customized biological maturation to new forms or...Forerunner mutation
“Miners were one of the main castes in Forerunner society, ranking below Builders but above...Miner