Avnä Guardian

Water Form. If the Avnä Guardian enters water it gains +5 to STR, DEX, CON checks and saves also +60 swimming speed and +5 on attack and damage rolls. It's Water Bash attack's reach increases from 5 to 15 ft. This effect ends if Avnä Guardian moves out of water. The Avnä Guardian in water form can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.

Magic Weapons. The Avnä Guardian’s weapon attacks are magical.

Innate Spellcasting. The Avnä Guardian’s spellcasting ability is Wisdom (spell save DC 12). It can innately cast the following spells, requiring no material components:

3/day each: Create or destroy water, Water Breathing, 

1/day each: Wall of water, 

Multiattack. The Awnä Guardian can do two trident attacks.

Trident. Melee Weapon Attack: +5 to hit, reach: 5 ft. Hit: 9 (1d8 +5) piercing damage. In addition the attack that hits does 1d8 cold damage. 

Water Bash. Melee Weapon Attack: +5 to hit, reach 5 ft. Hit: 21 (4d8 + 5) bludgeoning damage. On hit the target that is smaller than Avnä Guardian must throw a 16 STR / DEX save or being pushed back with 15 ft. and falls prone.

Whelm (Recharge 4–6) (Only in Water Form). Each creature in the Avnä Guardian's space must make a DC 16 STR save. On a failure, a target takes 14 (2d8 + 5) bludgeoning damage. If it is Large or smaller, it is also grappled (escape DC 14). 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 Avnä Guardian's space.

The Avnä Guardian can grapple one Large creature or up to two Medium or smaller creatures at one time. At the start of each of the Avnä Guardian's turns, each target grappled by it takes 14 (2d8 + 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 14 Strength check and succeeding.