As a reaction, which you use when you are hit by an attack or taking bludgeoning damage, you absorb some of the incoming energy and redirect it as a burst of kinetic energy. You have resistance to bludgeoning damage until the start of your next turn, including against the triggering damage. If the creature who damaged you is within 10 meters, it must make a Reflex saving throw.
On a failure, it takes 2d10 bludgeoning damage and is pushed 2 meters away from you if it is Medium or smaller.
On a critical failure, it takes twice as much damage and is pushed 4 meters away from you if it is Medium or smaller.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
You can increase the damage by 2d10, push the creature an additional meter, and affect a creature of a larger size for each additional mana expended.