Dragonsoul

The caster infuses themselves with a fire born from the magic of dragons.  

The next spell attack or unarmed strike (including racial traits like Claws and Bite) you make does an additional 1d8 fire damage and ignores any fire resistances the target might have.

At Higher Levels. This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8)