Elemental Adept: Fire is a passive feature obtainable by the Elemental Adept Feat. Your spells ignore Resistance to 
Fire. When you cast spells of that type, you cannot roll a 1.
Description
Spells you cast and attacks you make ignore Resistance to Fire damage. In addition, when you deal Fire damage with a spell, you cannot roll a 1.
How to learn
Granted by the feats: Elemental Adept