Cloud Mephit

Death Burst.  When the mephit dies, it explodes in a burst of lightning. Each creature within 5 feet of it must make a DC 11 Dexterity saving throw, taking 7 (2d6) lightning damage on a failed save, or half as much damage on a successful one.

False Appearance. While the mephit remains motionless, it is indistinguishable from an ordinary puff of cloud.

Innate Spellcasting.(1/Day). The mephit can innately cast shatter (spell save DC 11), requiring no material components. Its innate spellcasting ability is Charisma.

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

Lightning Breath (Recharge 6). The mephit exhales a 15-foot long, 5-foot wide line of lightning. Each creature in that area must make a DC 11 Dexterity saving throw, taking 7 (2d6) lightning damage on a failed save, or half as much damage on a successful one.