Poison Mist
2nd Level Servants of Rot Incantation or Necromancy
You summon a cloud of poison mist in a 10-foot radius sphere within range. Creatures that enter this cloud for the first time, start or end their turn in it, take 1d6 poison damage.
As a bonus action on your turn you can move the cloud up to 15 feet.
At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6, and the radius increases by 5 feet for each slot level above 2nd.