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 near the city of New Babylon and assimilated its essence, enabling them to evolve the carrion strain of the Swarm host.[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.