Dracula's son Xarus leads a coup against his father, the Lord of Vampires.
The vampires of Marvel Earth are part of the Mythos. Being created by the Darkhold (the source of the Necronomicon), which was created by Chthon, an Old One. The Darkhold not only has a spell which creates vampires but one that destroys them. Vampires have used the Darkhold to enhance themselves and Dracula, the Lord of Vampires was himself destroyed and restored by the Darkhold, and has used it to increase his powers.