Revenant

Having met a cruel and undeserved end, and have returned to the realm of the living at the behest of a god or patron you served in life. As a revenant, you thirst for revenge against those who wronged you, or seek to complete a final, critical task you left unfinished.

• Subrace: You gain the (Revenant) and (Undead) subtype.
• Undead Nature: As an undead, you no longer needs to eat, drink, sleep, or breathe. You must still rest in order to gain the advantages of a short or long rest, and cannot engage in any strenuous activities when resting. You are affected normally by poisons and gas.
• Constitution Bonus: +1 to Constitution.
• Unearthly Presence: Your appearance is waxy and ashen. Living creatures instinctively dislike you. You have disadvantage on Persuasion and Animal Handling rolls against living creatures.
• Turn Immunity: You have immunity against an effect that would turn undead.
• Relentless Pursuit: You are given a task by your god or patron. You know the distance and direction between you and your goal, as well as any intelligent thing that lies between you and your goal (GM's discretion, multiple triggers can be present at once but you must be on the same plane of existence in order to detect them). When your goal is complete, you will finally know peace and die, unable to be restored to life.
• Revenant Resilience: When you would be reduced to 0 hit points, you can drop to 1 hit point instead. You can’t use this feature again until you finish a long rest
• Undead Rejuvenation: While your hit points are below half their maximum (round up, e.g. 6 is half of 11), but above zero, you gain 1 hit point at the start of your next turn. If reduced to zero, you no longer roll for death-saves and instead are automatically stabilized at the of end of your next turn. You can still fail death saves through other mean (e.g. hit by enemies or failing other saving throws that would cause you to fail a saving throw). 
• Favor of a God: If you die or are destroyed, you may return to life if you have not lost the favor of your god or patron. If your body is destroyed, you are returned to life in a new body without any of your clothing or equipment. You may choose to return as yourself or in a completely new body. However, your stats, classes, and bonuses remain the same as when your last body was destroyed. Every time you are brought back to life, your constitution decreases by 1 as a punishment from your god or patron for not completing you task, and wasting the time and gifts they have given you. If this would ever cause your constitution to reduce your hit points to zero, your god or patron abandons you and your soul is destroyed; never to return even be means of a wish. At the GM's discretion, you can remove this penalty upon completion of a task or by your own actions that your patron or god finds favorable.