Ultralisk cavern

The Zerg Ultralisk Cavern is a shelled structure in which there are numerous high-radiation deposits and other dangerous substances. It is this extremely hostile enviroment which gives the Ultralisk its toughness. In addition, it provides the genetic coding for the Larva to morph into the breed itself.

With the recent ascension of Infested Kerrigan as the Queen of Blades, the Ultralisk Caverns can also provide additional genetic mutations for Anabolic Synthesis (for faster movement) and Chitinous Plating (for improved armor).