Carrion nests are biological structures related to carrion wasps, a creature from Cruxas III. During the Second Great War the Zerg Swarm found one of these structures and assimilated its essence.[1]


  1. Blizzard Entertainment. StarCraft II: Heart of the Swarm. (Activision Blizzard). PC. Mission: Heart of the Swarm, Swarm Host Evolution (in English). 2013-03-12.