Energy Substitution (Lighting)

You have the ability to change the elemental damage type of spells you cast. When you cast a spell that deals one of the following damage types: acid, cold, fire, lighting or thunder, you can substitute the damage type to the type chosen when you selected this feat. Changing the damage type of the spell does not change its saving throw, nor does it change any additional effects unless the DM determines that an effect does not make sense with the new damage type. Any additional damage from the spell is also substituted to the new damage type as long as it was one of the 5 elemental damage types. You can select this feat multiple times. Each time you do so, you must choose a different damage type.