Venomous Retort

You utter an exclamation laced with magic, and the creature that damaged you is momentarily surrounded by toxic gas. The creature must make a Constitution saving throw. It takes 2d6 poison damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.