Primordial Caster

Your blood seethes with elemental power.

Select an elemental damage type (acid, cold, fire, lightning, or thunder).

• Your spells dealing that damage type ignore any damage resistance possessed by the target.  
• When you cast a spell that deals damage of the chosen type, you deal 1 additional damage for every damage die with a result of 1.

This feat can be selected multiple times, choosing a different damage type each time.