The Greater Spire is a massive, towering structure with a sleek, aerodynamic design, resembling a fusion of organic and mechanical elements. Its surface is smooth with a glossy, dark purple exoskeleton-like texture, accented by glowing green bioluminescent veins that pulse with energy. The structure features sharp, wing-like protrusions extending from its sides, and a central, bulbous core that houses the Zerg's aerial mutation capabilities, emitting a faint, eerie glow.