Crackling Bulwark

A small coat of electricity covers your body while active, emitting dim light in a 10-foot radius around you and protecting you. 

Until the end of your next turn, your AC increases by 2, and you also become immune to being Stunned. The coating grants you resistance to lightning damage as well.

In addition, whenever a creature within 5 feet of you hits you with a melee attack, the coat quickly discharges with bolts of lightning. The attacker takes 5d8 lightning damage, and they must make a Constitution saving throw with a DC equal to the amount of damage they took. On a failed save they are Shocked until the end of their next turn. On a successful save they aren't Shocked.

Shocked

• A shocked creature is dazed, and feels a tingling sensation in their body. (Dazed = Can't perform both move/take an action. Also can't take bonus actions)
• The creature drops whatever it's holding.
• The creature has disadvantage on Dexterity saving throws.
• Attack rolls against the creature have advantage.