Master Chief, Halo 4 armor, dynamic pose, holding assault rifle, green metallic armor with battle scars, visor gold reflective, Cortana AI hologram on wrist, sci-fi background, futuristic battlefield, alien structures, UNSC vehicles in distance, explosion effects, dramatic sky, dusk lighting, action-packed scene, high-resolution texture, detailed weapon design, 3/4 view, cinematic composition, intense facial expression visible through visor, energy shield glow, atmospheric perspective.