Breath of Belladonna

You consume the belladonna berries used as a Material component, taking 3 Poison damage, and breathe out a poisonous cloud. Each creature in a 15-foot Cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 3d10 Poison damage and has the Poisoned condition until the start of your next turn. On a success, the creature takes half as much damage only. A creature that doesn’t need to breathe automatically succeeds on its saving throw.

Using a Higher-Level Spell Slot. If you use a level 3+ spell slot to cast this spell, the damage you deal increases by 1d10 for each spell slot level above 2. The damage you take doesn’t increase.