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Sigma radiation

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Sigma radiation slows down zerg movement and reaction speeds by up to 50%.

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. Blizzard Entertainment. StarCraft II: Wings of Liberty. (Activision Blizzard). PC. Zerg research (in English). 2010.

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