As an action, a fountain of churned earth and stone erupts from a point you choose on the ground within 35 meters. Each creature in a sphere centered on that point must make a Reflex saving throw. A creature takes 5d6 bludgeoning damage on a failed save, or half as much damage on a successful one. Additionally, the ground in that area becomes difficult terrain until cleared. Each 1.5-meters-square portion of the area requires at least 1 minute to clear by hand.
You can increase the damage by 2d6 for each additional mana or psi expended.