Dragon Lord's Rage

You breath in and release a roaring wave of flame breath. Each creature in a 20-foot cone must make a Dexterity saving throw. A creature takes 2d6 fire damage on a failed save, or half as much damage on a successful one. This damage is increased by extra 1d6 fire damege for each target beyond 2 in your 20-foot cone (extra 1d6 for 3 targets, 2d6 for 4 targets and so on). As the fire ignites even hotter the more targets it has.

The fire ignites any flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.