The Fireflies

The caster generates 3 small balls of flame and sends each of them towards a designated target. Upon reaching the target, or reaching its maximum distance of 35 feet, the ball explodes in a 10-foot sphere. Each creature in the sphere must make a Dexterity saving throw. The creature takes 5d6 fire damage on a failed save and half damage on a successful one.

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

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher the number of fireflies increases by 2 for each slot above 4th.