The Zerg Greater Spire is a massive, organic structure with a towering, asymmetrical form that dominates the landscape. Its surface is covered in thick, chitinous plates with a rough, textured appearance, featuring deep grooves and pulsating veins that glow with a faint, eerie bioluminescence. The structure's color palette is predominantly dark purples and blacks, accented by vibrant greens and blues from the glowing veins and sacs of fluid that dot its surface. At its apex, the Greater Spire splits into multiple, tentacle-like appendages that writhe slowly, giving it a distinctly alien and menacing presence.