Baby Firestorm

You create a ball of fire in your hand and slam it into the ground to create an explosion of fire, centered on self with a 5ft radius. Each creature within range must make a DEX saving throw or take 1d8 fire damage. The flame ignites any flammable objects in the area that aren't worn or carried.

this spells damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).