Mountain Quake

Requirements You are in Mountain Stance

You stomp, shaking the earth beneath you. Creatures on the ground within a 20-foot area take damage equal to your Strength modifier (minimum 0), with a fortitude save against your class DC. On a failure, they also fall Prone. After you use this action, you can't use it again for 1d4 rounds.

Special If you have this feat, the Dexterity modifier cap to your AC while using Mountain Stance increases from +1 to +2.