Guardian Custode (Earth-2042)

"A single Guardian can effectively police a system. This show of force is unsettling."

- 031 Exuberant Witness

Guardian Custodes, commonly known simply as Guardians, are powerful Forerunner droids built to enforce the Mantle within the Ecumene. Custodes are part of a wider category of policing constructs known as Peacemakers. Along with the Preceptors, the Guardians were classified as tier-two Peacemakers that were largely used to enforce order among the Forerunners' lesser subject species rather than Forerunner-inhabited star systems.

The Guardians were controlled by AI and operated through their connection to the Domain. In 12 ABY, Kylo Ren took control of the Guardians to enforce the will of the First Order.

Source

 * https://www.halopedia.org/Guardian_Custode