Devil's Flint

You create four dagger-shaped flames in your space. They float rotating in the air around you for the spell's duration. When you cast the spell, and as a Bonus Action on each of tour turns thereafter, you can expend one dagger, sending it streaking toward a point or a creature you choose within 60 feet of you. Each creature hit must make a Dexterity saving throw. A creature takes 1d6 fire damage on a failed save, or half as much damage on a succeful one.

The fire of these daggers ignites flammable objects in the point hitten that aren't worn or carried, than spreads.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the number of daggers created increases by two for each slot level above 1st