Coup De Grace

When you hit an attack on one creature you can draw upon your well of determination and grit and attempt to finish an opponent quickly in a single blow.

Roll 2d6 and add it to the damage dealt by the attack, if the creature's Hit Points do not reach zero as a result of your attack, you also receive double the rolled number as damage to your current Hit Points. You can choose to activate this after a damage roll, but before any effects are applied. After using this feature you must complete a long rest before using it again.