Wildfire fireball

Fireball 20-foot-radius sphere centered on a point within 150ft within line of sight, the fire also spreads around corners. A creature makes a Dex saving throw and takes 8d6 fire damage on a fail or half on success. The flames ignite flammable objects not being worn or carried. 

This spells damage increases by 1D6 for each level above the 3rd.