Constant Shrapnel

Glass shards spray out in a 15-foot radius from a point you choose within range, and continue to do so for the duration of the spell. Any creature that enters the area for the first time on its turn or begins its turn in the area must make a Dexterity saving throw, receiving 2d6 piercing damage on a failed save or half as much on a successful one. Prone creatures have advantage on their dexterity saving throw, rather than disadvantage as would be usual.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.