Undead

Whether it be through magical, divine, or other means, you have been resurrected from the dead. Unlike most undead, you have managed to retain or gain control of your senses.

You gain the following traits:

You gain the "Undead" creature type in addition to your current type. Any spell or ability that affects either of your creature types affects you. 

Unless a healing spell targets undead, you will not be healed. Healing also does not repair your body, but the mending spell will repair it. Healing Potions will still heal you and repair your body.

Instead of sleeping, you enter an inactive state for 4 hours each day. You do not dream in this state; you are fully aware of your surroundings and notice approaching enemies and other events as normal. Short rest remains the same, however you are able to achieve a long rest in 4 hours instead of 8.  Magical effects can still put you into a dreamless sleep. 

You do not age. You will always appear to be the age you were ressurected at.

You do not need to eat, drink, or breathe. However you are able to do each if you so desire. You are unable to drown and any attacks that target breathing have no effect on you. 

Fellow undead will ignore you unless provoked. Unless an attack is made against them, undead with no sapience view you as one of them. Undead who have also achieved sapience will be unable to immediately tell you are a fellow undead. 

You are resistant to necrotic damage. Your body is already dead and resistant to rot, however it is not immune to it. 

You are vulnerable to radiant damage. Like your fellow undead, your body is susceptible to damage from holy sources. 

You are immune to disease. Unless a disease is magical in origin, diseases cannot take hold in your undead body. 

Choose one trait according to backstory:

Undead Fortitude. Being undead makes you hard to kill. If damage reduces you to 0 hit points, you must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, you drop to 1 hit point instead.

OR

Chosen Presence. Someone or something is keeping you tied to this world. In the event of your demise, your body enters a catatonic state imperceptible from death. You remain in this state for 7 days as your body regains enough energy to continue on. At the end of 7 days, you reawaken at half HP. Each day after, you regain .05% of your max HP until you reach your max. You cannot be healed through any means to regain your HP limit, your body needs time to repair itself.