atomic dragons blood Fireball

A dark streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 50-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d8 fire damage on a failed save, or half as much damage on a successful one.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried. clings to buildings

please note dragon borne do not need the vials of blood

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 5th.