The creature can stomp its foot on the ground causing it to tremble, thereby knocking creatures smaller than it prone.
Prerequisite: Str 20, size Huge or larger.
Benefit: As a standard action, the creature can stomp its foot on the ground. This causes the ground to shake and shudder, and all creatures up to one size smaller and within a 10-foot radius must make a successful Acrobatics check (DC 10 + the creature’s Strength modifier) or fall prone.
Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games.