Water Form. The elemental avatar can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.
Freeze. If the elemental avatar takes cold damage, it partially freezes; its speed is reduced by 20 feet until the end of its next turn.
Magic Resistance. The elemental avatar has advantage to all saving throws vs. magic and magical effects.
Multiattack. The elemental avatar makes two slam attacks.
Slam. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 23 (4d8 + 5) bludgeoning damage.
Whelm (Recharge 4–6). Each creature in the elemental avatar's space must make a DC 17 Strength saving throw. On a failure, a target takes 23 (4d8 + 5) bludgeoning damage. If it is Huge or smaller, it is also grappled (escape DC 16). Until this grapple ends, the target is restrained and unable to breathe unless it can breathe water. If the saving throw is successful, the target is pushed out of the elemental avatar's space.
The elemental avatar can grapple one Huge creature or up to three Large or smaller creatures at one time. At the start of each of the elemental's turns, each target grappled by it takes 23 (4d8 + 5) 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 16 Strength check and succeeding.
Description
The elemental avatar most commonly appears as a large, vaguely feminine humanoid upper body supported a large swirling wave of water. It posses a spirit which most creatures find alluring and fascinating.
They typically choose to enter the prime plane (they do not have to be summoned) about the business of one of the greater elemental powers. When they communicate with others it is a voice which is reminiscent of water (ranging from a whispering brook to a crashing wave depending on their mood).
The elemental avatar is more than a simple summoned creature. When the elemental avatar leaves the elemental plane of water it tethers a piece of that plane within itself and brings it across with it. (Which renders them immune to banishment and similar effects which rely on their not being on their home plane).
If slain, the tethered heart of an elemental avatar can be used in the creation of many magical items concerned with elemental control, resistance, etc.
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