Banished from Death

You were once a vampire or other powerful undead who was slain by a worthy adversary, but when the hand of death reached for your soul, your spirit found a way to reject its call. You gain the following benefits:

Fanged Bite. You have fangs that you can use to make Unarmed Strikes that deal 2d4 piercing damage on a hit. 

Creature Type. Your creature type is Undead.

Cling to Life. You add your Constitution modifier (minimum of 1) to Death Saving Throws.

Deathless Nature. You no longer age naturally, and cannot die of old age. Additionally, you don’t need to drink or breathe, though you still need to eat. You can only eat a carnivorous diet.