Firegeist

The firegeist doesn’t require air, food, drink, or sleep.

The firegeist has advantage on Dexterity (Stealth) checks made to hide in fire or in areas lit by nonmagical fire.

While in an area of light created by a spell or other magical effect, the firegeist has disadvantage on attack rolls and ability checks.

The firegeist sheds dim light in a 5- to 20-foot radius. It can alter the radius as a bonus action.

For every 5 feet the firegeist moves in water, or for every gallon of water splashed on it, it takes 1 cold damage.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) bludgeoning damage plus 7 (2d6) fire damage. If the target is a flammable object, it ignites. If the target is a creature, the target must succeed on a DC 13 Dexterity saving throw or ignite. Until a creature takes an action to douse the fire, the target takes 3 (1d6) fire damage at the start of each of its turns.

The firegeist assaults the mind of one creature it can see within 30 feet of it with the painful, humiliating memory of the firegeist's first death. The target must make a DC 13 Wisdom saving throw. On a failure, the target takes 14 (4d6) fire damage and is frightened for 1 minute. On a success, the target takes half the damage and isn't frightened. While frightened, the creature takes 3 (1d6) fire damage at the start of each of its turns. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.