Stamp
( Savage Species, p. 39)[Monster]
You can stamp the ground to crush and disrupt opponents.
Prerequisite
feet, Huge size, trample special attack,
Benefit
You may, as a full-round action, strike a solid surface with one of your limbs and create a shock wave that radiates out from your position and continues for a number of feet equal to 5 × your base creature's Hit Dice. Make a single unarmed attack roll. Every creature in the affected area compares its Balance check result to your attack roll result. Those who fail this opposed check are knocked down.
Special
Each structure and unattended object that is at least partially within the shock wave takes damage equal to 1d6 + your Strength bonus + the object's hardness (maximum 5).