As two actions, you create a wave of water that crashes down in a sphere within 36 meters. Any creature in that cube must make a Reflex saving throw.
On a failed save, a creature takes 3d8 bludgeoning damage and if it is Large or smaller it is knocked prone and pushed up to 4.5 meters away from the center of the wave.
On a successful save, a target takes half as much damage.
Additionally, any burning creature or object in the area stops burning.
The water then spreads out across the ground in all directions, extinguishing unprotected flames in its area and within 9 meters of it, and then it vanishes.
You can increase the damage by 1d8 and affect a creature of a larger size for each additional mana or psi expended.