Hunger Of Hadar

V, S, M; 1 Action
A 20-foot-radius sphere of blackness and bitter
cold appears, centered on a point with 150 feet
for 1 minute (concentration). The area is
difficult terrain, and creatures within are
blinded. A creature that starts its turn in the
area takes 2d6 cold damage. A creature that
ends its turn in the area must succeed on a
Dexterity saving throw or take 2d6 acid damage.