Consume Light

You sap the ambient light from a 20-foot-radius sphere centered on a point you choose within range. The area becomes filled with magical darkness. Nonmagical light cannot illuminate this area, and any light spell of 3rd level or lower cast on the area is automatically dispelled.

When a creature enters the spell's area for the first time on a turn or starts its turn there, it must make a constitution saving throw. On a failed save, the creature takes 3d8 necrotic damage and its movement speed is halved until the start of its next turn. On a successful save, it takes half as much damage and its speed is not reduced.