Multiattack. The elemental makes two attacks.

Churning Burst. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 2) bludgeoning damage.

Condensate. As a bonus action, the elemental can merge with another mist elemental within 5 ft. to form a Greater Mist Elemental. The Greater Mist Elemental spawns at full health despite any damage its component elementals incurred before condensation.

Corrupt. As a bonus action, the elemental can target a single creature occupying its space. The target creature must make a DC 13 Constitution saving throw. On a success, nothing happens. On a failure, the creature's alignment is shifted to chaotic evil, and the creature is charmed unless it has resistance against being charmed. The corrupting effect persists until the remove curse spell is cast by another creature that shares the corrupted creature's true alignment. The elemental cannot use Corrupt on its next round if it successfully corrupts a creature.