Black Mist

You take a pinch of ash and rub your hands together before sending out a 20-foot cone of dark energy. Dark energy causes necrotic damage to all those in range. The mist is also considered heavily obscured until the end of your next turn, those in the area are considered deaf and blind while inside the cone. Creatures inside the area, when it is the spell is first cast, need to make a constitution saving throw or take 2d8 necrotic damage and take half on a save.

For each level above the second, the damage is increased by 1d8 and extends the number of rounds the mist stays in the area by one.