This article is about the Forerunner AI. For more uses of the term Guardian, see its disambiguation page.

A Guardian Custode was a Forerunner built, Tier Two Peacemaker Ancilla.[1] They were used to police "troublesome worlds" during the age of the Forerunner Ecumene.[2]

Class HistoryEdit

Ancient ServiceEdit

Originally the Guardians were built to record the legacy of the Precursors. Over time this idea would be lost to the Foreunners, and eventually the Ecumene would use the Guardians to keep lesser species in-line.[1] To help police solar systems, the Forerunners hid Guardians on numerous planets throughout the galaxy, and seemingly on every planet with life. Some of these planets include Meridian, Sanghelios, and Conrad's Point.


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In the October of 2558, after being "cured" of her Rampancy, Cortana awoke an unknown number of Guardians in the galaxy. She turned them against sentient species, claiming the Mantle of Responsibility for the Created.[3]



A Guardian consists of many polygonal pieces floating in unison to form an upright bird-like shape. On all parts of the structure there are massive glowing circles having unknown functions. Their size is described as the size of a skyscraper and are made completely out of Forerunner metal.

The face of the Guardian unnerved even the Forerunners and every attempt to change it failed.[1]

Function and BehaviorEdit

The Forerunners used the Guardians to keep troublesome worlds in-line with Forerunner laws during the age of their Ecumene.[2] They are capable of slipspace travel through a self-formed bubble.[4] They also possess EMP capabilities able to sabotage every piece of technology on a planet and its surrounding space.[3]


The ancillas of the Guardians were known to be "strange" and "cold" and had limited personality and empathy. The ancilla were also influenced by the Domain to become some of the best suited AIs to enforce the Mantle of Responsibility.[1]

Domain ConnectionEdit

The Guardian was connected to the Domain. Often times the Guardian would record the history of the species it protected and add it to the Domain.[1]


Announcement TrailerEdit

E3 2015 Campaign GameplayEdit