VAMPIRES!!
Vampires are truly one of the most interesting creatures if the night. They are not harmed in the sunlight, nothing really bothers them. Real Vampires aren't like the Cullens or Hales from Twilight. Sorry but in real life they get a 3% enhancement to strength, speed, and looks. Not all vampires drink blood though. Some Vampires drink through anything that has blood, not for the blood, but for the soul. That's right some Vampires don't drink blood they drink the soul.
Also living for eternity isn't as easy as Twilight makes it sound. What really happens is once a vampire gets old enough in their body they usually hunt for a human whose body they would wish to be in. Then once the human is alone they drain them. Once the once living human is a complete corpse, they inject venom with some of the vampire's DNA into the corpse. That way they can live on being a vampire. It is like half of them is dying and another is being born yes. Except for the fact that the vampires venom never runs out which equals life for eternity.
A different thing that some Vampires may do to live for eternity is not change into different hosts but they might just drain a Human or Mortal for the soul so they live as long as that person is. Example: A Vampire drains a mortal/human who is 27. The vampire has 27 years to live in that body.
Getting changed into a Vampire is sort of like Twilight but rest assured I have first hand experience with it. Some are bitten as a child thus being turned into a vexil. Then the child has from the age it is bitten to the age thirteen to decide wheather or not to become a Vampire. The other way is manually or just being bitten but the chances of surving or becoming a Vampire that way, chances of survival are very low.
Also if a Vampire has a blood exchange with you then you may be changed.
A Vampire can have extra abilities like in Twilight but the only difference is if the Vampire that bites you can read minds bites you then you too can read minds. Or if the Vampire wants you to have the ability to see the future they may bite you and give you their power and morph it into which ever power the wish for you to have.