Undertow

You create an area of water 20 feet deep. The DC for Athletics checks to Swim in the area is equal to your spell DC. A creature that starts its turn in the area must attempt a Fortitude save.

Critical Success The creature is unaffected.

Success The creature takes 2d6 bludgeoning damage.

Failure The creature takes 4d6 bludgeoning damage and takes a –2 circumstance penalty to Athletics checks to Swim and a –10-foot circumstance penalty to its swim Speed, if it has one, until it leaves the area.

Spell Effect: Undertow

Critical Failure As failure, and the creature is pulled 10 feet down.