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Sigma radiation

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Sigma radiation slows down zerg movement and reaction speeds by up to 50%.[1] The primal zerg are also vulnerable to its effects as well.[2]

The radiation was discovered by the United Earth Directorate, and psi disruptors invented by Egon Stetmann generated this radiation to weaken the zerg.[1]


  1. 1.0 1.1 Blizzard Entertainment. StarCraft II: Wings of Liberty. (Activision Blizzard). PC. Zerg research (in English). 2010.
  2. Blizzard Entertainment. StarCraft II: Heart of the Swarm. (Activision Blizzard). PC. Mission: Heart of the Swarm, The Reckoning (in English). 2013-03-12.

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