Elemental Freedom

As a spellcaster, you can change the damage type of any elemental spells you can cast, of your choosing, (Fire, Cold, Lightning, Poison, Acid) to any other element you choose. 

This is meant to reflavour spells like Fireball and Burning Hands into other elements as a character option. It can be taken at any level and with permission from your DM, you can take it before your campaign.