Metarch-class ancilla

Metarchs were a class of hyper-advanced ancillas created by the Forerunners to serve the Council. They were so exclusive that only five were in existence at any given time. Enormous ancilla networks known as metarchies were coordinated by a metarch. The most advanced level of metarch was the Contender-class, an example of which is Mendicant Bias.

A sub-metarch was a class of ancilla below a metarch. These AIs were commonly assigned to flotillas of several vessels, their intelligence distributed among the ships under their control. While they would only respond to the flotilla's commander, this could be bypassed with the proper verbal override codes. These codes were incredibly complex, consisting of hundreds of random words and numbers.

List of appearances

 * Halo 3
 * Terminals
 * Halo: Contact Harvest
 * Halo Legends
 * Origins
 * Halo: Cryptum
 * Halo: Primordium
 * Halo: Silentium
 * Halo: Rebirth