4-level Evocation
A burst of fire explodes out from you in a rolling wave, filling a 30-foot cone. Each creature in the area must make a Dexterity saving throw. On failure, the creature takes 6d8 fire damage and is pushed 20 feet away. On a success, the target takes half damage and is not pushed.
At higher levels: When you cast this spell using a 5th level spell slot or higher, the damage increases by 1d8 for each slot level above 4th.