Effluvial Cloak

A slight haze appears around you as you conjure a veil of pestilence. Creatures that begin their turn within 10 feet of you take 1d8 poison damage, as well as those that enter the space for the first time on a given turn.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.