Heavy Handed v1.2

Whether your a Duelist or a Brawler, you bring the hurt were it counts. Your swings can become heavy when you need them to.

When you make a Melee Weapon attack with one hand, and no other weapon in your hand, or make an Unarmed Strike against a target, and have Advantage on the Attack roll, you may forgo your advantage on that attack, to add one extra Weapon damage Dice to your hit. When you roll a 20 on your attack roll, you may add an extra Damage dice to your damage roll, you do not apply Critical damage to this dice. 

Once per turn, on your turn, when a target within 5 feet of you hits you with an attack, you may make an opportunity attack with Advantage