Energy Substitution

Whether attuned to a specific sub-school of Evocation or focusing on spells of a specific environment, you have learned how to infuse spells with an element which they may not normally be accustomed to being used with.  It may be a divine boon, or the product of arcane study, or some other reason, but you are clearly different than your spell casting peers.  You have gained the ability to sculpt the energy of your magic as well as to use your magic to blunt the effect of that element against you. 

When you gain this feat, choose one of the following damage types: acid, cold, fire, lightning, or thunder.

1) Increase your Intelligence or Wisdom score by 1.

2) Spells you cast which do a damage type of acid, cold, fire, lightning, or thunder may instead do the chosen type of damage.

3) As a reaction when you take the damage of the chosen type, you can expend a spell slot to reduce the damage by an amount equal to your spellcasting modifier times the expended spell slot level.

You may only select this feat once.