Fireball

V, S, M * (a tiny ball of bat guano and sulfur)
RANGE/AREA 150 ft (20 ft sphere)
Each creature in a 20-foot-radius sphere centered
on that point must make a DEX saving throw,
8d6 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 worn or carried.
+1d6 for each slot level above 3rd.