Reviver, Half-Life Wiki

Revivers, also known as Runners and mostly called Lightning Dog by Alyx Vance, are hostile creatures that inhabit the Quarantine Zone in City 17. They spit electrically charged liquid which can cause power failures in electrical equipment, which also deals minor damage to living creatures. Revivers can reanimate and control corpses, turning them into electric zombies. Revivers, are small creatures, akin to but slightly larger than a Headcrab. They have a triple-jawed maw at the front, four claw

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