Thanks to your unnatural gifts Strength, Charisma, and constitution scores are increased by 2 you also get to choose a feat of your choice 

Because you have lived for such an extensive time choose three languages you can speak, you already speak common

As an ancient blood vampire, you have strengths and weaknesses of a vampire. You have Immunity to necrotic damage.

As a vampire you have the following flaws:

Forbiddance. As a vampire can't enter a residence without an invitation from one of the occupants.

Harmed by Running Water. As a vampire takes 20 acid damage if it ends its turn in running water.

Stake to the Heart. If a piercing weapon made of wood is driven into the vampire's heart while the vampire is incapacitated in its resting place, the vampire is paralyzeduntil the stake is removed.

Sunlight Hypersensitivity. While in sunlight, it has disadvantage on attack rolls and ability checks. You are also weak to Radiant damage.

Living statue: Being a pure blood vampire wile you are well fed, you will appear mortal. Any living creature must make a Insight check against your charisma check to see through your disguise. 

Spider Climb. The pure blood vampire can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Natural Weapons. Your claws and fangs are natural weapons which you can use to make unarmed strikes, they deal 1d4 + your Strength modifier in slashing damage for your claws and 1d6+ your strength modifier in piercing  damage for your fangs 

You have the innate ability to cast Misty Step at will. 

The eyes of a Pure Blood Vampire are sharp as predators of night. You have Dark vision through regular and magical darkness out to 120ft. You also have advantage on perception when in darkness or dim light. 

When in shadow, your enemies have a hard time seeing you giving you a bonus if + 2 in stealth if you succeed in a stealth check. If you Fail you will be seen easier and quicker and will not obtain the bonus.

The Pure Blood vampire can sense the blood of bleeding creatures in a 500 meter radius of itself allowing it to hunt them down.

At all times you are capable of floating about 2-3 inches off the ground. anything Above this can only be sustained for 10 minutes. Equal to walking speed 

Because you are technically undead you don’t require any sleep only a form of meditation where you are still alert and aware of your surroundings.