In Dianne Duvall’s world of Immortal Guardians, there are virus which is transferred by blood, either by a transfusion or enough bites from an infected vampire. If a human is infected, they will also become vampires. While the virus makes the humans faster and stronger, it also makes them susceptible to sunlight and gives them a craving for blood. More importantly, the virus eventually drives them mad and they become ever more and more violent as the madness drives them to bloodlust.
There are also the gifted ones, those who have advanced DNA and special abilities. When they are infected with the virus, they receive all the benefits of speed and strength but will not fall victim to the madness. Also, their own individual gifts become enhanced. They can heal with their hands or teleport. They might read minds or feel emotions with only a touch.
Richard Armitage as Seth. Seth has been leading the Immortal Guardians for centuries. Unlike those he leads, Seth is an Other. He has the combined abilities to heal, teleport, read minds and even to destroy with only a thought. Seth believed that he could no longer sit back and observe the humans as the Others do and allow the vampires to run rampant. He banned together the gifted ones who were now Immortals and trained them to fight the vampires and protect the humans.