Breath Weapon: Electricity

When you take the Attack action on your turn,
you can replace one of your attacks with an exhalation of magical energy in a 30-ft. line that
is 5 ft. wide. Each creature in that area must
make a Dexterity saving throw (DC ). On a
failed save, the creature takes 2d10
lightning damage. On a successful save, it takes
half as much damage. You can use your Breath
Weapon 4 times, and you regain all expended
uses when you finish a long rest.