Source: Warhammer Fantasy: 7th 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 with no armour saves allowed - some of its members have gone irrevocably insane! This has no effect on units that are Immune to Psychology.

Next - Aura of Transmutation