Your Charisma score increases by 2, and either your Strength or Dexterity score (your choice) increases by 1.

You have superior vision in dark and dim conditions. You can see in dim light within 60 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

Vampires are undead. They do not need sleep, air, or food, and the only drink that sustains them is humanoid blood. They are affected as such by spells, items and abilities that function differently when used on the undead. For example, Cure Wounds has no effect on them, and they're subject to the secondary effect of Chill Touch.

Vampires gain resistance to Necrotic damage from any source, as well as to Bludgeoning, Piercing and Slashing damage dealt by non-magical weapons.

However, they are vulnerable to Radiant damage from any source, as well as to Bludgeoning, Piercing and Slashing damage dealt by silver weapons.

If any one thing is true about Vampires, it's that it's all about the blood. You need it. You want it. You may not like that you have to drink it, but damn if it isn't exactly what you need to take the edge off.

Vampires gain a bite attack that deals 1d6 Piercing damage, has the Finesse property, and counts as a magical weapon. The target's maximum hitpoints are reduced by an amount equal to the damage dealt until the target completes a long rest. If the target is a willing, incapacitated, or restrained humanoid, the Vampire has an opportunity to drink some blood from the target, and recovers the same amount of hitpoints (up to her maximum) that the opponent lost from the bite.

Every night that the Vampire goes without drinking blood, the starvation causes her to gain 1 level of Exhaustion that cannot be removed by any means except for drinking blood. A pint of specially-prepared, bottled humanoid blood counts as a Potion of Healing when imbibed by a Vampire, and removes 1 level of Exhaustion caused by Thirst for Blood. Each successful use of the Vampire's bite attack against a willing, incapacitated or restrained humanoid removes 1 level of Exhaustion caused by Thirst for Blood.

Bottles of stored blood can be created with a DC15 Intelligence (Alchemy tools) check. Each check requires a pint of fresh humanoid blood (either drawn from a living victim or from a corpse slain no longer than an hour ago), and a dose of anticoagulant worth 25 gp. Each check takes 10 minutes of work drawing the blood, measuring and mixing the anticoagulant. If the check succeeds, a single bottle of blood is created, and will last indefinitely without drying or spoiling. If the check fails, no item is created and the materials are wasted.

Forbiddance - Vampires cannot enter a residence without an invitation from one of its occupants.

Harmed by Running Water - Every time the Vampire ends her turn in running water, she takes Acid damage equal to her character level.

Stake to the Heart - If a piercing weapon made of wood is driven into the Vampire's heart, the vampire is paralyzed until the stake is removed. Driving a stake through a Vampire's heart takes an action, and requires that the Vampire be willing, incapacitated or restrained. If a Vampire suffers a critical hit from a wooden weapon, that weapon has a 20% chance of piercing the Vampire's heart. This chance is reduced to 10% if the Vampire is wearing medium armor or benefiting from a mage armor spell, or a Monk's Wisdom-based or Barbarian's Constitution-based AC bonus. A Vampire wearing heavy armor cannot be staked by a critical hit with a wooden weapon.

Sunlight Hypersensitivity - Every time the Vampire starts her turn in sunlight, she takes Radiant damage equal to half her character level (round down, minimum 1). She also has disadvantage on attack rolls and ability checks in sunlight.

Choose any one humanoid race (and subrace/variant, if applicable) that is available to player characters. Plenty can be found in Chapter 2 of the Player's Handbook. This is the race your Vampire character was before she died, and the race she'll return to being if she's ever destroyed and subjected to resurrection magic.

You gain the Languages trait of the race you chose, but that is all that's left to you of the living world, in the wake of the changes wrought by vampiric undeath. You don't stack racial traits or ability scores, with a single exception -- if you were a member of a Small race in life, such as a Halfling, your Size is still Small. Vampirism doesn't induce growth spurts!

If a Vampire is ever resurrected, she loses all Vampire racial traits, including her ability score adjustment, and gains all the racial traits and ability score adjustments of the race she chose for her Past Life.