Armor of lightning absorption

While wearing this armor you have resistance to lightning damage. When you get struck with lightning damage you can use a reaction to gain immunity to lightning damage once you use this feature you cannot use it again until the next long rest. you can either cast the lightning bolt Spell DC 15, or you can decide when you hit a creature with a Melee weapon attack to deal in additional 4D6 Lightning damage, after using one of these two features you cannot use them again until the next long rest unless you use the lightning absorption ability which if you do you can use these features one additional time.