As a reaction, which you use when you are hit by an attack, water swirls around your body.
If the creature who damaged you is within 10 meters it must make a Reflex saving throw as a jet of water shoots out at it.
On a failed save, it takes 3d6 bludgeoning damage and if it is Medium or smaller it is pushed up to 2 meters away from you.
On a successful save, a creature takes half as much damage.
You can increase the damage by 4d6 and affect a creature of a larger size for each additional mana or psi expended.