Dragon's Breath

Source: Player's Handbook

Level 2 Transmutation (Artificer, Sorcerer, Wizard)

Casting Time: Bonus Action
Range: Touch
Components: V, S, M (a hot pepper)
Duration: Concentration, up to 1 minute

You touch one willing creature, and choose Acid, Cold, Fire, Lightning, or Poison. Until the spell ends, the target can take a Magic action to exhale a 15-foot Cone. Each creature in that area makes a Dexterity saving throw, taking 3d6 damage of the chosen type on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 2.