Betrayed Death. Your kind have cheated death. You are technically immortal but at which price?

Dark Impulses. While not beholden to evil, the dark influence on your kind inflicts upon you sudden depraved impulses. Your kind tend towards evil alignments but those that resist that inclination tend towards lawful good alignments.

Silent as the Grave. Your kind makes barely a sound as you move. You are proficient in the Stealth skill. Your sudden presence can be unnerving and you also gain advantage on Charisma (Intimidate) checks made when hidden.

Bloodlust. Your kind relish the kill and mercy is far from your mind in the heat of battle. You cannot choose to inflict non-lethal damage on your attacks.

Advanced Darkvision. You have superior vision in dark and dim conditions. You can see in dim light within 120 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

Vampiric Bite. Two slender hollow fangs glisten in your mouth, perfect for siphoning off the blood of helpless creatures. Your fangs are natural weapons, which you can use to make unarmed strikes. You may only make unarmed strikes in this way against willing creatures, restrained creatures, incapacitated creatures, or creatures you are grappling.
If you hit with your fangs you deal piercing damage equal to 1d4 + your Strength modifier, and 2d6 necrotic damage, instead of the bludgeoning damage normal for an unarmed strike. The target's hit point maximum is reduced by an amount equal to the necrotic damage taken, and you gain temporary hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Being of Darkness. You have resistance to necrotic damage.

Scorched By Light. You are vulnerable to radiant damage.

Undead Magic. You know the vicious mockery cantrip. Once you reach 3rd level, you can cast the suggestion spell once per day as a 2nd-level spell. Once you reach 5th level, you can also cast the gaseous form spell once per day as a 2nd-level spell. Charisma is your spellcasting ability for these spells.

Sunlight Sensitivity. You have Disadvantage on attack rolls and on Wisdom (Perception) checks that rely on sight when you, the target of your attack, or whatever you are trying to perceive is in direct sunlight.

Mortal Tongue. You can speak, read, and write Common and another language of your choice.