Humperdink’s Halitosis

1st-level transmutation

Casting Time: 1 action
Range: Self (15-foot cone)
Components: V, S
Duration: Concentration, up to 1 round
Class: Bard, Sorcerer, Warlock

You belch forward acidic fumes, afflicting those in a 15-foot cone before you. The fumes spread around corners. All creatures in the area must make a Constitution saving throw, taking 3d4 acid damage on a failure or half as much damage on a success.

The fumes linger until the end of your next turn or until dispersed by a moderate or stronger wind. Any creature ending its turn in the area must make a Constitution saving throw, taking 3d4 acid damage or half as much damage on a success.

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

Source: Heliana's Guide to Monster Hunting