Dust Mephit

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.

The mephit can innately cast the following spells, requiring no material components:
1/day: sleep

The mephit exhales a 15-foot cone of blinding dust. Each creature in that area must succeed on a DC 10 Dexterity saving throw or be blinded for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.