The Defender cannon is the main armament of sentry bot security mechs. Sentry bots are equipped with two, one on each arm. Eradicators are equipped with Peace Keepers, enhanced versions of the defender cannon.[1]


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