[i]Promethean Knights[/i] are the digitized minds of humans, Forerunner Warrior-Servants, or anything between, plugged into hard-light combat frames; the Requiem type can slipspace and is more durable than those guarding Guardians. Promethean Soldiers would be a more viable candidate for control overriding, Caboose. Speaking of which, the Warden uses forms like that, but bypassing his security would be harder than installing said AI on a Guardian.