Concentrated Fire Breath Weapon

You can use your action to exhale destructive energy. You create 5 by 15 ft. line of fire. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus.  A creature must succeed on a Dexterity saving throw or take 2d6 fire damage. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level.

It ignites flammable objects in its area that aren't being worn or carried.