The Ultralisk Cavern is a massive, organic structure with a rugged, chitinous exterior resembling the carapace of an Ultralisk. Its form is asymmetrical, with protruding spines and segmented plates that suggest growth and adaptation. The surface features a combination of smooth, glossy areas where the exoskeleton is newest and rough, weathered textures where it has endured battles. The cavern's entrance is flanked by large, curved tusks, and the interior is dimly lit with a bioluminescent glow, hinting at the Zerg's hive-like construction.