Source: Warhammer: The Old World Online Rules Index

Thunderstomp
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Colossal feet and gigantic hooves do damage beyond imagining when they kick and stomp upon the enemy. Any Stomp Attacks made by a behemoth have an Armour Piercing characteristic of -2. However, this rule cannot be used against another monster (monstrous creatures or behemoth) – they are simply too big to be stomped on effectively.

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