Divinity's Wind

You touch one willing creature and grant it the ability to spew divine energy from it's lungs. Choose either radiant or necrotic damage. Until the spell ends, the creature can use an action to exhale a divine wind of the chosen type in a 15-foot line. Each creature within the line must make a Constitution saving throw, taking 3d6 damage of the chosen type on a failed save, or half as much damage on a successful one.

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