Elemental Natural (Fire)

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

• Spells you cast ignore resistance to fire damage. In addition, for 1 minute after casting a spell that deals fire damage, roll 1d20 whenever you cast a spell that deals cold damage. On a 1, roll 1d8 cold damage per spell level, and take that damage, as the reverse of your elemental nature lashes back.
• When you roll damage for a spell you cast that deals fire damage, you can reroll any 1. You must keep the reroll.