Darkness Blast

You summon a dome of pure poisonous energy, any enemy that enters it must make a CHA saving throwing or take 1d10 damage, or half as much if it succeeds. It decreases your enemies speed by 20ft.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10 for each slot level above 1st.