Confringo

A small bright red explosive ball of fire shoots out of your wand at a target you choose within range. The target and any other creature in a 5 foot sphere centered on the target must make a Dexterity saving throw, taking 8d6 Fire damage on a failed save or half as much damage on a successful one.

Flammable objects in the area that aren’t being worn or carried start burning.

Using a Higher-Level Spell Slot. The damage increases by 1d6, and the radius of the by 1 foot for each spell slot level above 3.