Death Burst. When the mephit dies, it explodes in a burst of dust. Each creature within 5 feet of it must then succeed on a DC 10 Constitution saving throw or be blinded for 1 minute. A blinded creature can repeat the saving throw on each of its turns, ending the effect on itself on a success.   Innate Spellcasting (1/Day). The mephit can innately cast sleep, requiring no material components. Its innate spellcasting ability is Charisma.