A long time ago, there was a family that had just lost their child to a werewolf. In an effort to protect their children, the mother, who was a witch, found a spell that could protect their children and the parents from ever feeling the loss again. However, she did not use the original spell and modified it twice, adding to it. You have been transformed into one of these vampires, being one of the original lines of vampires. As a creature of the night reanimated through magic, you have several powers because your physiology has changed, giving you superhuman abilities.
As an original vampire, your superhuman strength allows you to toss humans around like nothing, crush buildings to pieces, and, with enough effort, destroy an island. Depending on how old you are, your abilities could be much stronger. You also possess superhuman speed and agility, being able to move faster than human eyes can see. Even some supernatural creatures with enhanced senses can't keep up with you, and your reaction time is just as fast. Your senses have also been enhanced by being able to hear conversions from blocks away from the source, smell things from the side of a city, and see in complete darkness. Along with the super strength comes increased durability that allows you to take blows that would destroy buildings just fine and a regenerative healing factor that can heal anything within seconds, so long as you have not been beheaded. Like all vampires, you have immortality.
Besides the physical powers, you also possess mental abilities that are supernatural in nature. Being able to enter and influence the minds of others, controlling thoughts or influencing them, erasing memories, creating illusions, and more. You can sire other vampires by feeding your blood to humans; this can heal humans without turning them, though if they die they become vampires in transition, and if they feed on a human they forever turn into a vampire or die if they don't. The vampires you create are loyal to you. Vampires also possess some minor miscellaneous abilities like controlling the weather, controlling small animals like wolves or birds, manipulating elements, shutting off their own emotions, flying, and even shape-shifting. Vampires get stronger with age, and the more blood they consume, the stronger they get. The less blood they consume, the weaker they get. Vampires possess a weakness for sunlight, white oak stakes, decapitation, and vervain. The older a vampire is, the less affected they are by these weaknesses. You gain a daylight ring and the knowledge of how to create one, although you do not possess the magic needed for its creation.