The kelp drake latches onto a Medium or smaller creature it can see within 5 feet of it and rolls itself and the target. The target must make a DC 13 Constitution saving throw. On a failure, the creature takes 7 (2d6) slashing damage and is stunned until the end of its next turn. On a success, the creature takes half the damage and isn't stunned. The kelp drake can use this action only if both itself and the target are immersed in water.