Victor's Big Fireball

Sometimes the big bad is surrounded by underlings, and a big blast would reduce them to kindling. Victor's Big Fireball is what you need; a less concentrated blast with greater coverage. You throw a burning ball to a point you choose within range and it then blossoms with a low roar into an explosion of flame. Each creature in a 40-foot-radius sphere centered on that point must make a Dexterity saving throw. The spell deals 8d6 fire damage on a failed save, or half as much damage on a successful one, and damage is further reduced by half (rounded down) for each 10 feet away from center (full damage within 10 feet, half damage within 20 feet, and so forth).

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 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.