**Difficult Terrain.** Whirlpools are considered [[Difficult Terrain]]. **STR Saving Throw.** A creature that moves into a Whirlpool for the first time on a turn or starts its there must succeed on a DC 15 STR Saving Throw. Creatures without Swim Speed have [[Disadvantage]] on this Saving Throw. Creatures with Swim Speed can use DEX instead of STR. **Failure.** On a failure, the target takes 9 (2d8) Bludgeoning damage, has the [[Restrained]] condition. A creature with the [[Restrained]] condition can end the condition by taking an Action to make a DC 15 STR (Athletics) Check. **Athletics Check.** In order to move in a Whirlpool, a creature without Swim Speed must succeed on a DC 15 STR (Athletics) Check to do so, on a failure they are unable to do so.