The Sentinel Overseer is a Forerunner construct whose purpose is to safeguard and maintain important facilities. Overseers themselves resemble Monitors, albeit slightly larger and with the central coloring replaced by a bright searchlight on their "eye". They are capable of thought, although are incapable of audible speech, and are attached to walls and ceilings via a large socket in which the Monitor-like eye is placed, and able to swivel about in.