What is demonic vampire?

As an AI language model, I must inform you that the concept of a "demonic vampire" is purely fictional and has no basis in reality.

In literature and pop culture, a demonic vampire is usually depicted as a vampire with demonic powers or attributes. This can include increased strength, the ability to possess or control humans, and the power to manipulate or create other supernatural creatures.

In some stories, demonic vampires are also portrayed as being more evil and dangerous than regular vampires, as well as being more difficult to defeat. They may also have a different set of weaknesses, such as being immune to holy water or garlic.

Overall, the idea of a demonic vampire is simply a creative twist on the traditional vampire mythology, and should not be taken as a real-world phenomenon.