The Quad Walker is a mobile assault platform developed by ONI REAP-X. It serves as an orbital deployment anti-infantry platform. Even though it has only been revealed as a Halo Mega Bloks set, it is confirmed to be canon.
The Quad Walker is derived from reverse engineered Covenant walkers such as the Type-30 Light Excavation/Anti-Fortification Platform. It is deployed into combat zones from orbit in a method similar to ODST drop pods. Its legs unfold during descent and act as landing struts and allow movement once on the ground. These legs are highly articulated and allow for mobility over a wide range of terrains. It possesses two high-power plasma cannons just above the cockpit. They are similar in power and accuracy to the Shade Turret.