Vampiric Nature. You are now considered both an undead and a humanoid. You retain all of your normal traits of your normal race.

Forbiddance. You can't enter a residence without an invitation from one of the occupants. A sign on the outside of a building saying something like "open for business" will also allow you to enter a building.

Stake to the Heart. If a piercing weapon made of wood is driven into your heart while you are incapacitated in a place of rest, you become incapacitated until the stake is removed.

Sunlight Hypersensitivity. 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.

Bite With Intent

Once per day as an action you may bite with the intent to drain another creature of its life. The creature you are biting must either be willing, grappled, restrained, or incapacitated by you. If an unwilling creature bitten this way is able to successfully escape restraint, grappling, or incapacity the effect ends. An unwilling creature must make a wisdom saving throw, the DC for this saving throw equals 8 + your intelligence modifier + your proficiency bonus. A creature takes 2d6 necrotic damage per turn on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. After you use this ability once you can’t use it again until you complete a  long rest.

The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and the vampire regains 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. A humanoid slain in this way and then buried in the ground rises the following night as a vampire with all of the abilities this racial variant grants.

Your Charisma score increases by 2, and two other ability scores of your choice increase by 1.

Your aging slows to a halt. You are unable to age any further than the exact age you were when you became a vampire.

Half-elves are about the same size as humans, ranging from 5 to 6 feet tall. Your size is Medium.

Your base walking speed is 30 feet.

 Cursed by your vampire heritage, you can easily see through darkness. 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.

You have advantage on saving throws against being charmed, and magic can’t put you to sleep.

You gain proficiency in two skills of your choice.

You can speak, read, and write Common, Elvish, and one extra language of your choice.