Headquarters unit that represents a city's defenses.
The organising organism of a Tyranid's hive, the Norn Cyst is always the first biostructure to be placed. The Malanthrope places the hive in a suitable location and tends its exponential growth as the hive manages and defends any connected biostructures. When the hive's use has passed, the Malanthrope strips the Cyst's living connections and carries to a new source of biomass. The remaining redundant structure sloughs itself back into the nearest reclamation pool. Soon, the hive is completely gone.