Ball Lightning

When you cast this spell you weave lightning energy togehter into a 10feet diameter sphere in an area that you can see. Any creature within the sphere's area or within 10 feet of the sphere must make a dexterity saving throw against your spellsavd DC, creatures within the sphere's area do so with disadvantage. On a failed save, any creature takes 5D8 lighting damage,and half as much on a succesful one. On subsequent turns while you are concentrating, you can use your action to roll the sphere 20 feet and cause it to arc out once more, any creature within the sphere's area repeats the saving throw and suffers damage.