Disclaimer: Due to the fact that Guardian Sentinels were initially designed during the early development of Halo 2, and were also cut from Halo 3, this is based on the Halo 3 giant boss battle concept of the guardian.

Unlike the Guardian Custodes from Halo 5, a Guardian Sentinel is a form of strato-sentinel designed to escort Forerunner Keyships or other strato-sentinels near the end of the Forerunner/Flood War. Due to the Flood being their intended target, Guardian Sentinels are completely autonomous and have a very basic AI, as the Flood can convert biomass into additional forces and corrupt ancillas with the Logic Plague. For weapons, Guardian Sentinels have an up-scaled sentinel beam capable of cutting through Forerunner starship grade armor in their eye, and pulse missiles located on their back. The entire construct is also protected by a capital ship grade energy shield, with the extremely durable chassis beneath. Combining the damage output, the rather tanky chassis, and the near immunity to Flood infection, and you can see why these constructs were called Guardians.

Controls: Also in craft instructions.

Pitch: Move Forward/Reverse

Roll: Strafe Left/Right

Yaw: Turn Left/Right

VTOL: Adjust Hover Altitude

Trim: Adjust Tilt Angle (fine tune vertical firing angle of Sentinel Beam)

AG1: Overclock Impulse Drive

AG2: Toggle Pulse Missiles