Energy Substitution

Prerequisite: Be able to cast a spell.

You pick an elemental damage type upon taking this feat (acid, cold, fire, lightning, or thunder) and refer to that for the rest of the feat.

You can change the damage type of any spell that deals elemental damage to the damage type you've chosen. i.e. fireball dealing thunder damage.

You gain an additional choice every time you take this feat but cannot take a type you've already chosen.