Vampire

Encyclopedia Entry:

Inhabits the demon realm, etc.  A rare monster that possess high magic power, as well as a surprising amount of superhuman strength.  They only reveal themselves as night.  They use the cover of darkness to attack their prey.  They are full of pride, considering themselves to be nobility while looking down upon humans as lesser beings.

In the same manner as other succubus-type monsters, men’s spirit is what fuels them, but they don’t try to get it through sexual intercourse like the succubus, instead biting the neck of their prey with their fangs, and sucking out blood.  Through this they get spirit.  Perhaps because when they suck blood, they infuse a man with a slight amount of magic power, the men don’t feel pain from the act of them feeding.  Instead, it is said that both the vampires and the men are able to experience sexual pleasure.  Furthermore, for the vampires themselves, not only is the man’s blood a sweat treat, it also functions as an aphrodisiac.  Due to the pleasure and narcotic effect of sucking blood, most of them feel a large amount of lust towards their prey directly after feeding, but as far as they are concerned, copulation with a human being is a filthy act, so most vampires will probably try to control their lust.