Rat Swarm

Rat Swarms are colonies of Rats that have formed a sort of mobile community. Rats’ natural instincts are to congregate, and these are further trained to act and move as one, having been bonded through breeding, recognition of scent, and the application of drugs and other stimuli. Existing apart from its swarm is as unnatural for one of these Rats as standing in a fire or breathing water. A skilled Packmaster can keep these swarms of vermin together as a single, directed group, even on the battlefield, and can direct them as he wills. Numbering upwards of 100 rats per swarm, these rats are a mix of brown, black, and white rats. The sight of a Rat Swarm is enough to make any commoner and none too few warriors turn tail and flee.

Source

 * Warhammer Fantasy RPG 2nd ED -- Children of the Horned Rat
 * pg. 115

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