Source: Warhammer Armies Project: Unofficial 9th Edition

Aura of Madness
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Each enemy unit within 12" of one or more Jabberslythes at the beginning of the Beastmen Magic phase must take a Leadership test. For every point by which a unit fails its test, it suffers a wound which Ignores Armour Saves. This has no effect on units with Immunity (Psychology).

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