Covenant air artillery
From Halopedia, the Halo wiki
The Covenant Air Artillery is an early airborne Covenant vehicle armed with three Plasma Mortars (the main armament of the Wraith). As it has no on board defenses, it can be very vulnerable if dealt with promptly. However, its heavy plasma mortar cannons can lay waste to an entire UNSC base. It only appears in Halo Wars.[1]