7 Deficient Radiance is a Forerunner Artificial Intelligence, originally built to maintain Installation 02 of the Halo Array. He performs a multitude of tasks, acting as a Caretaker, Historian and Guard, as well as having the important job of finding a Reclaimer (If the Flood ever found another foothold in the galaxy) and igniting the Halo rings. He is most known for starting a brief but violent war in 2585.