Magma Mephit

Death Burst. When the mephit dies, it explodes into lava. Each creature within 5 feet makes a DC 10 Constitution saving throw, taking 4 (1d8) fire damage on a failed save or half damage on a success.

False Appearance. While motionless, the mephit is indistinguishable from a small magma flow.

Elemental Nature. A mephit doesnt require air, sustenance, or sleep.

Claws. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) slashing damage plus 2 (1d4) fire damage.

Heat Metal (1/Day). Ranged Spell Attack: +4 to hit, range 60 ft., one creature wearing or holding a metal object. Hit: 9 (2d8) fire damage. If a creature is holding the object and suffers damage it makes a DC 10 Constitution saving throw dropping the object on a failure.

Fire Breath (1/Day). The mephit exhales a 15-foot cone of fire. Each creature in the area makes a DC 10 Constitution saving throw taking 7 (2d6) fire damage on a failed save or half damage on a success.