D&D The Regenerator - Warlock Patron (5e)
You have made a deal with an entity of great perseverance. It is a creature that does not wish to die¸ and has developed great powers to make sure it does not. You have learned to tap into this creatures magical powers to full your own. This gives you the magical abilities you possess¸ and also the extraordinary additional features unique to your patron. Your patron is likely something that has been close to the edge of death¸ such as a nearly slain divine entity of less significance.