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The Guardians are the titular secondary antagonists of Halo 5: Guardians and presumably Halo: Infinite. They are Forerunner AI constructs created to enforce Forerunner laws on troublesome worlds and keep them in line. In Halo 5: Guardians, Cortana awakens a number of them to assist her in her goal of claiming the Mantle of Responsibility for the Created.
The Guardians were originally created by the Forerunners to oversee worlds they deemed troublesome. The Forerunners also attempted to use the Guardians against The Flood, but only proved to be ineffective against the parasite. The Forerunners later hid the Guardians beneath the crust numerous planets throughout the galaxy. An exception to this measure was the one placed on Sanghelios. It was merely submerged in shallow water and was one of the numerous Forerunner constructs on the planet left totally unhidden. The Covenant apparently had some limited knowledge of the Guardian's function which leads them to worship it, while praying for its eternal slumber. The AI's installed within Guardians while relatively simple in design were noted to develop strange personalities and habits. Notably, it was these AI's who constructed the "faces" on the Guardians which unnerved even the Forerunners. However, any attempt by Forerunners to remove these faces were unsuccessful.
Halo 5: Guardians
The Guardians were later discovered by Cortana and reactivated to enforce the AIs' claim to the Mantle of Responsibility. Guardians soon activated on many human colonies, causing innumerable amounts of damage. Before the Guardians awoke, however a human cult leader by the name of Dasc Gevadim discovered the Guardians and made them the focus of the cult. He lead his members to the location of one Guardian where they were presumably wiped out by the machine's activation.
After their activation, all of the Guardians moved to the planet Genesis, where they were deployed to their designates systems. At least some of Guardians used their EMPs to disable any opposition upon arriving in their systems. The one assigned to earth engaged in a brief battle against the UNSC fleet above Syndey, Australia before deploying its EMP.
Halo Wars 2
When Professor Anders of the Spirit of Fire's crew commandeered a newly built Halo Installation in order to return to civilization, she is intercepted by a Guardian which forces the Halo out of slipspace
The Guardians will presumably return in Halo Infinite as major antagonists.