Actions

Multiattack. The elemental makes three slam attacks.

Slam. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 18 (2d10 + 7) bludgeoning damage.

Whelm (Recharge 4–6). Each creature in the elemental's space must make a DC Strength saving throw. On a failure, a target takes 18 (2d10 + 7) bludgeoning damage. If it is Large or smaller, it is also grappled (escape DC 22). Until this grapple ends, the target is restrained and unable to breathe. If the saving throw is successful, the target is pushed out of the elemental's space.

The elemental can grapple one Large creature or up to two Medium or smaller creatures at one time. At the start of each of the elemental's turns, each target grappled by it takes 18 (2d10 + 7) bludgeoning damage. A creature within 5 feet of the elemental can pull a creature or object out of it by taking an action to make a DC 22 Strength check and succeeding.

Bonus Actions

Blood Drain. The elemental can attempt to drain the blood from any creature(s) it currently has grappled. All targeted creatures must make a DC 18 Constitution saving throw. On a failure, the creature takes 4 (1d8) necrotic damage and one level of exhaustion. On a success, the creature only takes the necrotic damage. The elemental gains 1 HP for every point of necrotic damage done with this feature.