Arcane mist

You point at an area within range, and a sphere of thin mist imbued with magic appears there with a radius of 15 ft. When a creature starts their turn in the mist, they must pass a constitution saving throw with DC 15 or take 2d6 damage of a damage type that you choose out of the following: ice, psychic, poison or fire.

At higher levels: If used with a 4th level or higher spell slot, add 1d6 damage for each spell slot above 3rd level.