cantrip evocation water 

Traditions arcane, primal

Cast [>>] somatic, verbal

Range 30 feet; Area a 5-foot cube

Saving Throw Reflex

Water blasts upward, coming out of the ground, rising from a pool, or even manifesting from thin air. Any creatures in the area take bludgeoning damage equal to 1d4 plus your spellcasting ability modifier, with a basic Reflex saving throw.

You can change this spell's area to a 5-foot burst, provided you center the burst in a body of water. This body of water can be as small as a pond or creek, but not as small as a puddle or bathtub.

Heightened (+1) The damage increases by 1d4.

Secrets of Magic, page 130.