Giant Fire Elemental

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

Fiery Aura. A creature that ends its turn within 5 feet of the fire elemental takes 5 (1d10) fire damage. A creature that touches the elemental or hits it with a melee attack while within 5 feet of it takes 5 (1d10) fire damage. The elemental sheds bright light in a 30-foot radius and dim light for an additional 30 feet.

Water Weakness. The elemental takes 6 (1d12) cold damage if it enters a body of water or starts its turn in a body of water, is splashed with at least 5 gallons of water, or is hit by a water elementals slam attack.

Elemental Nature. An elemental doesnt require air, sustenance, or sleep.

Multiattack. The elemental makes two slam attacks.

Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 24 (4d8 + 4) fire damage and the target suffers 5 (1d10) ongoing fire damage. A creature can use an action to end the ongoing damage.

Wildfire (Recharge 4-6). The elemental moves up to half its Speed without provoking opportunity attacks. It can enter the spaces of hostile creatures but not end this movement there. When a creature shares its space with the elemental for the first time during this movement the creature is subject to the elementals Fiery Aura and the elemental can make a slam attack against that creature.