Corrode Wave

You manifest a swirling pool of greenish energy around you before releasing it into a wave of toxic energy. Each creature within range, other than you, must succeed on a Constitution saving throw or take takes 4d4 poison damage immediately. If they fail, they will take additional 1d4 poison damage and are poisoned until their next five turns. If they succeed, they take half the damage.

When you cast this spell using a spell slot of 3rd level or higher, the damage (both initial and later) increases by 1d4 for each slot level above 2nd.