Creep Colonies generate and maintain the think organic bio-matter that other Zerg structures need to function. The Colony will continue to produce an ever-expanding zone of infested terrain until it reaches its maximum range of influence. Even before a Creep Colony has blanketed its immediate surroundings with Creep it can be transformed to provide either air or ground defense for the Hive cluster.

Spore Colony

When a Creep Colony metamorphs into a Spore Colony, it grows a special sensory organ exactly like those found in Overlords. This sensory cluster gives the Spore Colony the innate ability to detect cloaked and concealed units. The Spore Colony also produces a corrosive variation of the Creep that it can launch at passing air units.

Sunken Colony

While the Spore Colony provides excellent defense against aerial assults, the Sunken Colony protects the Hive cluster from ground-based attacks. Rooting itself deep within the Creep, the Sunken Colony grows multiple tendrils that it can use to attack any enemies that come too close to its deadly grasp.