Harbinger's Echo is a sleek, futuristic sparrow with a streamlined, aerodynamic design, featuring a matte black chassis accented with glowing purple energy lines that pulse with an otherworldly glow. The sparrow's body is constructed from a lightweight, durable alloy, with smooth, curved surfaces that transition into sharp, angular fins at the rear for stability. The cockpit is minimalistic, with a transparent, tinted canopy that offers a clear view, and the undercarriage reveals intricate mechanical components that hint at advanced propulsion technology.