Undying Flesh

Level 4+

Your body bears a blessing - or curse - that slows your decay, fortifies your flesh, and lets you defy death for just a little longer. You gain the following benefits:
Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.
Lingering Soul. Your body does not decay for 10 days after death, as if under the effects of the gentle repose spell.
Perseverance. When you succeed on the three death saving throws while you have 0 hit points, you regain 1 hit point instead of becoming stable.