Burning Ice of Stygia (Cold Fire)

When you gain this feat, you gain the following benefits:

• As a bonus action, you can change the damage type of your fire spells to cold. This lasts for 30 minutes or until you use a bonus action to revert the damage type back to fire.
• While your flames burn cold, fire type spells you cast ignore resistance to cold damage. In addition, when you roll damage for a spell you cast that deals cold damage, you can treat any 1 on a damage die as a 2.