https://5e.tools/races.html#reborn_vrgr
Deathless Nature.
You have escaped death, a fact represented by the following benefits:

You have advantage on saving throws against disease and being poisoned, and you have resistance to poison damage.
You have advantage on death saving throws.
You don't need to eat, drink, or breathe.
You don't need to sleep, and magic can't put you to sleep. You can finish a long rest in 4 hours if you spend those hours in an inactive, motionless state, during which you retain consciousness.

Knowledge from a Past Life.

You temporarily remember glimpses of the past, perhaps faded memories from ages ago or a previous life. When you make an ability check that uses a skill, you can roll a d6 immediately after seeing the number on the d20 and add the number on the d6 to the check. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

https://5e.tools/classes.html#warlock_phb,state:isshowfluff=b1~sub-undying-scag=b1

Among the Dead

Additionally, undead have difficulty harming you. If an undead targets you directly with an attack or a harmful spell, that creature must make a Wisdom saving throw against your spell save DC (an undead needn't make the save when it includes you in an area effect, such as the explosion of fireball). On a failed save, the creature must choose a new target or forfeit targeting someone instead of you, potentially wasting the attack or spell. On a successful save, the creature is immune to this effect for 24 hours. An undead is also immune to this effect for 24 hours if you target it with an attack or a harmful spell.