Ash Form. The elemental can move through a space as narrow as 1 inch wide without squeezing. A creature that touches the elemental or hits it with a melee attack while within 5 feet of it takes 5 (1d10) fire damage. In addition, the elemental can enter a hostile creature's space and stop there. The first time it enters a creature's space on a turn, that creature must make a DC 18 Constitution saving throw or take 16 (3d10) fire damage and be blinded until someone takes an action to remove the ashes, the creature takes 5 (1d10) fire damage at the start of each of its turns.

Illumination. The elemental sheds bright light in a 30-foot radius and dim light in an additional 30 feet.

Water Susceptibility. For every 5 feet the elemental moves in water, or for every gallon of water splashed on it, it takes 1 necrotic damage.

Evasion. If the elemental is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.

Legendary Resistance (2/Day). If the elemental fails a saving throw, it can choose to succeed instead.

Multiattack. The elemental makes two Grab attacks.

Grab. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) bludgeoning damage plus 18 (4d8) fire damage and the target is grappled (escape DC 18). If the target is a flammable object, it ignites. Until a creature takes an action to douse the fire, the target takes 5 (1d10) fire damage at the start of each of its turns.

Hurl. The elemental throws a creature grappled by it. That creature is no longer grappled. Ranged Weapon Attack: +14 to hit, range 60/180 ft., one target. Hit: Both the hurled creature and the target take 27 (3d12 + 8) bludgeoning damage, and the hurled creature falls prone.

Ember Flare (Recharge 5–6). The embers of the elemental flare in a 20-foot radius sphere centered on it. The elemental regains 10 hit points and each other creature in that area must make a DC 18 Dexterity saving throw, taking 49 (9d8) fire damage on a failed save, or half as much damage on a successful one.

The elemental can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The elemental regains spent legendary actions at the start of its turn.

Toss. The elemental makes a Hurl attack.

Ashen Form (Costs 2 Actions). The elemental can move up to half its flying speed without provoking opportunity attacks. It regains 10 hit points.