Venom Blast

A bright green streak flashes from your pointing finger to a spot you choose within range and then quickly expands into an eruption of venom. Each creature in a 20-foot-radius sphere 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.

The poison spreads around corners. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d6 for each slot level above 3rd.