War of the Vampires is 4-part story arc in issues #14-17 of the 8th volume of Avengers written by Jason Aaron and David Marquez. In which a civil war erupts within the Vampire Nation, one which drags both the Avengers and Russian Winter Guard into it.
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The vampires of Marvel Earth are part of the Mythos. Being created by the Darkhold (the source of the Necronomicon), which was created by the Elder God Chthon. 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.