Earthshaking Step

As a standard action, you can stomp on the ground, causing every creature within 10 feet of you that is either standing or climbing on a surface connected with the ground to make a Refl ex save or fall prone. Once you have used this ability, you cannot do so again for 5 rounds. You and your summoned earth elemental (see below) are never knocked prone by the use of this ability.

Earthshaking Step

Greyhawk(Pathfinder) PillanPatera