Homebrew
The Soulbound are beings that were once mortal but have been transformed into undead creatures, their bodies animated by lingering souls or dark magic. They possess unique abilities and a connection to the realm of death.
Deathless Nature. You have escaped death, a fact represented by the following benefits:
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.
Necrotic Resistance: You have resistance to necrotic damage.
Deathly Touch: Your touch carries the chill of the grave. When you make an unarmed strike, you can choose to deal necrotic damage instead of bludgeoning damage.
Darkvision: You have darkvision with a range of 60 feet.
Soul Siphon: As an action, you can target a creature within 5 feet of you Make a melee spell attack (using Constitution as your stat) against a creature within your reach. On a hit, the target takes 2d8 necrotic damage, and you regain hit points equal to half the amount of necrotic damage dealt. You can use this equal to your proficiency bonus.
Undead Resilience: You have advantage on saving throws against being frightened and charmed.