Blurred Form. Attack rolls against the mephit are made with Disadvantage unless the mephit has the Incapacitated condition.
Death Burst. The mephit explodes when it dies. Dexterity Saving Throw: DC 10, each creature in a 5-foot Emanation originating from the mephit. Failure: 5 (2d4) Fire damage. Success: Half damage.
Claw. Melee Attack Roll: +2, reach 5 ft. Hit: 2 (1d4) Slashing damage plus 2 (1d4) Fire damage.
Steam Breath (Recharge 6). Constitution Saving Throw: DC 10, each creature in a 15-foot Cone. Failure: 5 (2d4) Fire damage, and the target's Speed decreases by 10 feet until the end of the mephit's next turn. Success: Half damage only. Failure or Success: Being underwater doesn't grant Resistance to this Fire damage.