Misty Form. The elemental can enter a hostile creature's space and vice versa. In addition, if air can pass through a space, the elemental can pass through it without squeezing. Each foot of movement in water costs 2 extra feet, rather than 1 extra foot. The elemental can't manipulate objects in any way that requires fingers or manual dexterity.

Unusual Nature. The elemental doesn't require air or sleep.

Deathly Chill (Recharge 4–6). Each creature in the elemental's space must make a DC 14 Constitution saving throw. On a failure, a creature takes 10 (1d8+5) cold damage plus 10 (1d8+5) necrotic damage and is restrained until the end of its next turn unless it has resistance or immunity to cold or necrotic damage. On a success, a creature takes half as much damage and isn't restrained.

Terrifying Transformation (Recharge 5-6). As a bonus action, the elemental can temporarily transform a single target creature occupying the elemental's space into a monster from the numerous Domains of Dread. The target creature must make a DC 15 Constitution saving throw. On a success, the creature only takes 10 (1d8+5) cold damage plus 10 (1d8+5) necrotic damage and is restrained until the end of its next turn unless it has resistance or immunity to cold or necrotic damage. On a failure, the creature rolls 1d6, transforms into a monster from the Terrifying Transformation table, takes on a steaming, misty aura, and becomes hostile toward all creatures except mist elementals. The effects of the transformation wear off and the creature returns to its original state after the creature or the elemental that transformed it has been defeated.