The Zerg Hive Cluster is a massive, organic structure with a grotesque yet fascinating biomechanical design. Its form is asymmetrical, featuring pulsating sacs, spiked protrusions, and veiny tendrils that spread across its surface. The exterior is covered in a rough, chitinous texture with a dark, glossy finish, interspersed with glowing, bioluminescent nodes that emit a faint, eerie light. The cluster's base is anchored by thick, root-like appendages that burrow into the ground, giving it a stable yet menacing presence.