Blood of Immortality: The Hunter Everett Chronicles

For over half a millennium, the Empire of the Vampyres stood united and unchallenged. Immortality was their greatest weapon. The world was their playground. But therein lay their greatest weakness; a secret that created their entire race, which also held the power to destroy it. And so came the dark years in the year 2006 AD when the Source, a tiny but powerful creature whose blood fed their immortality was stolen. With their only lifeline gone, their Empire stood on the verge of collapse, ...