Chromatic Breath

You touch a willing creature that has a mouth and can breathe, imbuing it with the power to expel elemental energy. When you cast the spell, select one of the following damage types: acid, cold, fire, lightning, or poison. Until the spell ends, the target can use its action to exhale a powerful elemental gust in a 15-foot cone. Each creature in that cone must make a Dexterity saving throw. On a failure, a creature takes 3d6 damage of the selected type. On a success, it takes half as much damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each level above 2nd.

Source: Kibbles Compendium of Legends and Legacies