Cole Screen

A Cloud of Coal Dust erupts from your mouth. Each creature in a 60-foot cone must make a Constitution saving throw. A creature takes 1d6 Poison damage on a failed save, or half as much damage on a successful one. Even if successful all targets will be blind for 1 round.

When cast, make a Constitution Saving throw against your own Spell dc. If Successful take no Damage. If failed take 1d4 Poison Damage

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