Cinder Breathe

You exhale a 30-foot cone of flame and ash. Each creature must make a Constitution saving throw. A creature takes 4d6 fire damage on a failed save, or half as much damage on a successful one. On a failed save, creatures are incapacitated until your next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 1st.