You have the ability to make a bite attack against either a willing creature, a creature that is charmed or grappled by you, or a creature that is restrained or incapacitated. You can use your Strength or Dexterity for your bite's attack roll. On a hit, your bite deals 1d4 piercing damage plus necrotic damage equal to 1d6 plus the ability modifier used to make the attack roll. You may also choose to regain hit points equal to the amount of necrotic damage dealt with this attack. These hit points can only be regained by attacking a living creature and has no impact on constructs or undead. 

Although you can eat or drink food, you can also sustain yourself with mortal blood. Additionally, you do not require air to breathe but healing magic such as healing potions or spells that normally restore hit points have no impact on you. 

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.

Your Strength, Constitution or Dexterity score increases by 1, and your Charisma score increases by 2. 

Dhampirs mature at roughly the same rate as humans but do not age further after reaching maturity, and they do not die of old age.

As with humans, a dhampir's alignment is solely determined by the individual, though due to their unique heritage and the subsequent treatment by most of the world they easily fall to evil.

Tieflings are about the same size and build as humans. Your size is Medium.

Your base walking speed is 30 feet.

Thanks to your vampiric heritage, 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 have Advantage on death saving throws and your natural regenerative powers mean when you spend hit die your constitution modifier is considered to be double the value it normally is. You cannot, however, heal by magical means (such as cure wounds or a healing potion).  

Once per day you can roll advantage on a persuasion, intimidate or insight check and cast the spell charm person once per day.  Charisma is your spellcasting ability for this spell. You require no components to cast this spell using this trait, but your target must be able to see you. You regain the ability to cast this spell when you finish a short or long rest.

You can speak, read, and write Common and two additional languages of your choice.