The vampire demon, sometimes referred to as vamp demon, is a half vampire half demon hybrid. This type of creature is generally considered extremely evil and dangerous. Pure demons are of non-human origin, and, some say are actually angels that have fallen out of grace and now serve the devil. Vampires on the other hand were once human creatures. When you meet a vamp demon, you are therefore meeting someone that is not close to being human, and has little empathy for humans or living creatures (the influence of the demon side), as well as little empathy for vampires themselves. This is what makes them so dangerous. In addition, the vampire demon has powers that go beyond those of the vampire…combine that with sunlight not being much of an issue for them, and their ability to live longer without blood, and you have a nearly unstoppable creature. Vamp demons are also extremely rare. Human portrayals of these creatures are that of an extremely evil being (see image below), but there is some thought that they can mask themselves as humans pretty easily, and don’t necessarily all look like the image pictured below…

The expression “bat out of hell” is a good reference to the vamp demon.
vamp demon mask