uncommon evocation water 

Cast [>>] somatic, verbal

Range 120 feet; Area 10-foot radius, 20-foot-tall cylinder

Saving Throw basic Reflex

You raise a pair of towering waves and slam them into each other, crushing creatures caught between them. Creatures in the area take 5d6 bludgeoning damage with a basic Reflex save.

Heightened (+1) Increase the damage by 2d6.

Secrets of Magic, page 201.