Prerequisites: Strength of 13
In place of an attack, you can spend Maneuver Dice (up to your Proficiency Bonus) and strike the ground, forcing all targets within 5 feet to make a Strength saving throw. On a failure, targets take bludgeoning damage equal to the Maneuver Dice spent + your Strength modifier and fall prone. On a success, they take half as much damage and do not fall prone.
Terrain in this area that is loose earth or stone becomes difficult terrain until a creature uses its action to clear it.