Mending Affinity

Your body has begun to adapt extremely well to healing itself through extraordinary means, gifting you the following benefits:

• Increase your Constitution score by 1, to a maximum of 20.
• When a creature uses a healer's kit to stabilize you when you are dying, you also regain hit points equal to your proficiency modifier.
• Whenever you regain hit points as a result of a spell, potion, or class ability, you regain additional hit points equal to your proficiency modifier.

- Matthew Mercer, Tal'Dorei Campaign Setting, Pg. 109