Rate

The five main social classes in Forerunner society were known as rates. Each rate specialized in a particular field of work, and had varying societal function and cultural importance. Rates were divided into several tiers, including forms and Maniples.

Practices

Adolescent Forerunners, known as Manipulars, were not associated with any particular rate. 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.

List of rates

Builders

Main article: Builder

The Builders were responsible for the construction of a majority of Forerunner architecture. As such, they were responsible for designing and creating most of the Forerunners' megastructures, including the Halo Array and Onyx. The father of Bornstellar was a Builder.

• Master Builder

Miners

Main article: Miner

The Miners were the second-highest rate in Forerunner society. They were responsible for obtaining the materials required for the work of the Builders.

Lifeworkers

Main article: Lifeworker

The Lifeworkers were the third-highest rate in Forerunner society. They specialized in biology and medicine, especially with the experimentation of various forms of life. It was not uncommon for Lifeworkers to receive their own planets for experimentation. The Librarian was a Lifeworker.

• Lifeshaper

Warrior-Servants

Main article: Warrior-Servant

The Warrior-Servants were the fourth-highest rate and primary military caste in Forerunner society. They were responsible for, among other things, piloting war sphinxes during the Human-Forerunner wars. The Prometheans were an elite group of Warrior-Servants.

• Prometheans

Engineers

Main article: Engineer (rate)

The Engineers were the lowest rate in Forerunner society, and were tasked with constructing and maintaining structures and machinery, as well as astroengineering.

• Plasma jockeys

List of appearances

• Halo: Cryptum (First appearance)