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