The Behemoth Heart is a large, mechanical organ harvested from the robotic Behemoth creatures, resembling a fusion of organic and machine parts. Its core is a pulsating, glowing blue energy source encased in a metallic shell with intricate circuitry and hydraulic veins visible through transparent panels. The exterior is weathered and battle-damaged, with scratches and dents from combat, and the surface alternates between smooth, polished metal and rough, textured areas where natural elements have eroded the machinery.