Triton's whirlpool

It is necessary to speak true triton tongue in order to cast this spell.

This spell can only be cast in an open body of water.

A giant whirlpool, of 80 feet in radius, appears on an open body of water, capable of destroying large boats and even medium sized ships. While creatures on the sides of the whirlpool don't take direct damage, they must do a strength check and will be pulled to the middle on a failed one. Every creature in the middle, however, must do a strength skill check every turn or take 13d6 bludgeoning damage on a failed save, or half as much on a successful one.