Breath Weapon: Lightning

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-foot line
that is 5 feet wide. Each creature in that area
must make a DC 16 Dexterity saving throw. On
a failed save, the creature takes 3d10 lightning
damage. On a successful save, it takes half as
much damage.
You can use your Breath Weapon 5 times, and
you regain all expended uses when you finish a
long rest.