Balefire Blast

A quiet explosion of cursed green flame flashes and erupts from your pointed finger. Each creature in a 30ft cone emanating from you must make a Dexterity saving throw, taking 4d6 Fire and Acid damage and become poisoned on a failure or half as much damage on a success and not become poisoned. The fire spreads around corners, igniting flammable objects in the area that aren't being worn or carried.

If a Construct or Undead fails their saving throw against this spell, they catch fire and take 1d6 Fire and Acid damage at the start of each of their turns. They or a creature within 5ft of them can use their action to snuff out the flames, ending the damage. The flames from this spell are cursed and ignore resistance to Fire and Acid damage.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, increase the initial Fire and Acid damage of this spell by 1d6 for each slot level above 4th.