Your set of fangs is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal piercing damage equal to ld4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike. In addition, you may choose to spend one of your hit dice to drain blood from the creature. Add the hit dice + your Constitution modifier as additional necrotic damage to your Bite. You then recover hit points equal to the necrotic damage dealt. Once you spend a hit dice with this feature, you cannot do so again until you finish a long rest.

You can see up to 60ft in the dark 

You can speak, read, and write Common and one extra language of your choice. Dhampirs typically learn the languages of other peoples they deal with, including obscure dialects. They are fond of sprinkling their speech with words borrowed from other tongues: Orc curses, Elvish musical expressions, Dwarvish military phrases, and so on.

 As an action, you can transform your appearance or revert to your natural form. You can’t duplicate the appearance of a creature you’ve never seen, and you revert to your natural form if you die. You decide what you look like, including your height, weight, facial features, the sound of your voice, coloration, hair length, sex, and any other distinguishing characteristics. You can make yourself appear as a member of another race, though none of your game statistics change. You also can’t appear as a creature of a different size than you, and your basic shape stays the same; if you’re bipedal, you can’t use this trait to become quadrupedal, for instance. Your clothing and other equipment don’t change in appearance, size, or shape to match your new form, requiring you to keep a few extra outfits on hand to make the most compelling disguise possible. Even to the most astute observers, your ruse is usually indiscernible. If you rouse suspicion, or if a wary creature suspects something is amiss, you have advantage on any Charisma (Deception) check you make to avoid detection.

You have resistance to necrotic damage.

Your constitution increases by 2 and your dexterity score increases by 1