Ball Lightning

You transform yourself into a ball of electric energy. Choose a point in range that you can see, you rush to this point in a straight line. Any creature in your path must succeed on a dexterity saving throw or take 3d 10 lightning damage, on a successful save they take no damage.

 When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d10 for each slot level above 3rd.