Aqueous 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. 

Acidic Form. If a creature starts its turn in the same space as the elemental, the creature takes 10 acid damage. A melee attack made with a non-magical weapon against the acid elemental destroys the weapon, as acid eats through the item, and non-magical ammo fired at the elemental cannot be recovered.

Freeze. If the elemental takes cold damage, it partially freezes; its speed is reduced by 20 feet until the end of its next turn.

Multiattack. The elemental makes two dissolve attacks.

Dissolve. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) acid damage.

Glob. Ranged Weapon Attack: +6 to hit, reach 35 ft,. one target. Hit: 13(4d4 + 3) acid damage.