Echo Pulse

You release a series of clicks that originate from a 10 foot radius around you. The soundwaves made by the clicks create powerful vibrations in the surrounding water up to a 90 foot radius from the spell's origin.

Any creature within that range must make a Constitution saving throw. On a failed save, a target takes 14d6 force damage and is stunned and deafened. On a successful save, a target takes half as much damage and is only deafened. If a target is killed by this damage, its head explodes, assuming it has one.

A stunned target can make a Constitution saving throw at the end of each of its turns. On a successful save, the stunning effect ends.