Aqua (powerbonded form)

Water Form. Aqua can enter a hostile creature's space and stop there. he can move through a space as narrow as 1 inch wide without squeezing.

Freeze. If aqua takes cold damage, he partially freezes; his speed is reduced by 20 feet until the end of his next turn.

Legendary Resistance (3/Day). If Aqua fails a saving throw, he can choose to succeed instead.

Multiattack. Aqua makes two attacks one with his tail and one with his bite.

Tail attack: Melee Weapon Attack: +10 to hit, reach 100 ft., one target. Hit: (15d6 + 5) bludgeoning damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and auqa can't restrain another target this way 

Bite: Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: (8d8+5) piercing damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and Aqua can't bite another target

Whelm (Recharge 4–6). Each creature in Aquas space must make a DC 19 Strength saving throw. On a failure, a target takes (5d4+5) bludgeoning damage. If it is smaller than aqua, it is also grappled (escape DC 20). 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 aquas space.

Aqua can grapple one huge creature or 2 large creatures or up to 4 Medium or 6 small creatures at one time. At the start of each of Aquas turns, each target grappled by him takes 13 (2d8 + 4) bludgeoning damage. A creature within 5 feet of one of the trapped creatures can pull a creature or object out of him by taking an action to make a DC 16 Strength and succeeding.