Elemental Affinity (5e Feat)
From D&D Wiki
Prerequisites: The ability to cast at least one spell
You gain better control over your spells and the elements. You gain the following benefits:
- Increase your spellcasting ability score by 1, to a maximum of 20.
- Choose a spell of up to Level 5. You can, as a bonus action, change the damage type from this spell to Fire, Cold, Lightning, Acid, Thunder and Poison.At level 17, you can also change the damage to Force, Radiant, and Necrotic.