Amulet of Recovery

Your Constitution score is 19 while you wear this amulet. It has no effect on you if your Constitution is already 19 or higher without it. Additionally, as an action you may touch a willing creature, including yourself, and expend any number of your hit dice to heal that creature. Hit dice used in this manner take an additional day to recover. This feature may be used when you do not have hit dice remaining, but instead of using hit dice, you take damage equal to the damage healed. 

Notes: Set: Constitution Score, Buff, Jewelry