Acid Form. The elemental can move through a space as narrow as 1 inch wide without squeezing.

Corrosive Aura. Any creature within 5 feet of the elemental takes 5 (1d10) acid damage at the start of its turn.

Acid Absorption. Whenever the elemental takes acid damage, it gains temporary hit points equal to the damage dealt. These temporary hit points last for 1 hour or until expended.

Acidic Explosion. When the elemental is reduced to 0 hit points, it explodes in a burst of acid. Each creature within 10 feet of the elemental must make a DC 15 Dexterity saving throw, taking 27 (6d8) acid damage on a failed save, or half as much damage on a successful one. The elemental's remains are destroyed and can't be used to restore the elemental to life.

Multiattack. The elemental makes two slam attacks.

Slam. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 4) bludgeoning damage plus 10 (3d6) acid damage.

Whirlpool. The elemental can create a whirlpool of acid as an action. Each creature within a 10-foot radius of the elemental must make a DC 15 Dexterity saving throw, taking 18 (4d8) acid damage on a failed save, or half as much damage on a successful one. The whirlpool lasts for 1 minute or until the elemental uses this action again.