Your body has the ability to recover quickly from terrible injuries, and is unusually receptive to healing magic. You gain the following benefits.
Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.
Adrenalin. When you are successfully stabilized while dying, you regain Hit Points equal to your Constitution modifier (minimum of 1). You can use this feature a number of times equal to your Proficiency Bonus per Long Rest.
Incredible Vigor. Whenever you regain Hit Points as a result of a spell, potion, or class feature (but not this feat), you regain additional Hit Points equal to your Constitution modifier (minimum of 1).