Elemental Expert

Elemental Expert Prerequisite: Prerequisite: Elemental Adept feat When you gain this feat, choose one of the following damage types: acid, cold, fire, lightning, or thunder. (of which you need the elemental adept version)

Spells you cast treat immunity to damage of the chosen type like resistance, and when you roll damage for a spell you cast that deals damage of that type, you can treat any 1's and 2's on a damage die as a 3.

You can select this feat multiple times. Each time you do so, you must choose a different damage type.