As an action, make a melee weapon attack with a weapon that deals bludgeoning damage to cause a tremor to ripple out from the creature. Each creature on the ground other than you within 1 meter of the creature must make a Reflex saving throw.
On a failure, a creature is knocked prone.
You can add the stamina die as bludgeoning damage if the creature fails the saving throw for each additional stamina die expended.
You can expend 1 additional stamina dice to increase the area to within 2 meters of the creature.