The Necromorph Cannon Arm is a grotesque fusion of organic and mechanical elements, featuring a twisted, sinewy structure with exposed muscle fibers and metallic reinforcements. The arm terminates in a large, gaping maw-like cannon, lined with sharp, bony protrusions and glowing with a sickly green bioluminescence. The surface is a mix of rough, scarred flesh and polished metal plates, with visible veins pulsating with dark energy.