Cloud of Decay

You summon forth a cloud of putrifying gas in a ten foot radius around a point you choose within range. For the duration, whenever a creature moves into the area for the first time on its turn or starts its turn within the gas, it must make a Constitution saving throw or take an amount of necrotic damage equal to your spellcasting ability modifier, taking half as much on a successful save. A strong wind of 15 miles per hour or faster will disperse the gas.

At higher levels. When you cast this spell with a spell slot of second level or higher, the damage increases by 1d6 per slot level above first.