Supernatural War

The whole world has been invaded by beings of high power. They could somehow transform into something unnatural. What was led of the human population called them the Supernaturals.
(Exert from book)
'...a urban legend, passed down through many centuries. The legend tells of a make werewolf volunteering to try the new serum others of the pack had made. The serum would change the person into a hybrid unlike anyone had ever seen.....
Others tried the serum before the man but.... only he had survived. The legend goes on to say that the hybird is destined to find the 'special one'. No one knows why their suppose to met but it clearly says that the 'special one' is human.'