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Boomer is a symptom combo exclusive to the Necroa Virus DLC which allows zombies to explode when excited. Severity increases when this combo is in play. The symptom Autothysis and the ability Liquefactive Necrosis are required. The achievement Boomer is earned for forming the combo.

Trivia[]

  • This combo is based off an eponymous infected enemy in Valve's Left 4 Dead franchise, though with significantly increased offense. Valve's Boomers are considerably less destructive, and rely on attracting other infected, rather than pure demolition power.
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