Water Form. The elemental 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 takes cold damage, it partially freezes; its speed is reduced by 20 feet until the end of its next turn. The monster can only be damaged while frozen

Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) bludgeoning damage.

Acid Throw. Ranged Weapon Attack: +2 to hit, reach 40 ft, one target. Hit: 7 (1d6 + 4) acid damage. Creates a pool of acid on the ground in the space of the target if the attack hits, otherwise no pool of acid is created. at the start of a creatures turn if it is in a space that has an acid poll it must make a DC 12 constitution saving throw. On a fail the creature takes 7 (1d6 + 4) acid damage 

Whelm (Recharge 4–6) Each creature in the elemental's space must make a DC 15 strength saving throw. On a failure, targets takes 7(1d6 + 4) acid damage

Raise (Recharge 4–6) spawns up to 3 acid slimes at the location of any three acid pools