Venomous Eruption

A pillar of green erupts from the ground at a point you choose within range and then quickly blooms into a mushroom cloud of poison. Each creature in a 20-foot-radius cylinder centered on that point must make a Constitution saving throw. A target takes 6d6 poison damage on a failed save, or half as much damage on a successful one.

Also on a failed save, the target is poisoned until the end of their next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.  The area of effect is also increased by 5ft for each spell slot above 3rd.