| Build time
| Built by
|| Heavy, Structure, Biological
The Ultralisk Cavern provides the genetic coding for the Larva to morph into the fearsome Ultralisk. The Ultralisk Caverns can also provide additional genetic mutations for Anabolic Synthesis (for faster movement) and Chitinous Plating (for improved armor).
Deep within the shelled Cavern are numerous high-radiation deposits and dangerous substances. The extremely hostile environment within the cavern is what gives the mighty Ultralisk its unearthly toughness. Its genetic material has been subjected to countless tests and experiments, and only the final, viable code is used to provide Zerg Larvae with the key necessary to morph into a new Ultralisk.
Little is known about the Ultralisk Cavern in StarCraft 2, but it is still required in order to produce Ultralisks.