Quote Originally Posted by Antogames View Post
she is a monster who eat blood and the s**** of her victim (thanks Wikipedia)
These are the succubus in folklore...
Not Morrigan!

About Aensland succubi
It is generally said that the Succubus race absorbs the spirit of the opposite *** and uses it as their own energy source. But the succubi that live in the Aensland family are slightly different. They create a special secretion liquid in their body when they are either physically or mentally stimulated. They use this liquid to maintain their life. If one were to be trapped inside a small secluded area, she would die within two days due to the lack of stimulus.

This is because the liquid needed to maintain her life can't be secreted. But to make up for this, they have become able to look into the dreams of others. When no stimulus was given, they evolved other ways to look for excitement. When a creature dreams, a special secretion liquid is formed in the brain. A succubus can take this liquid from the outside. Those who have been robbed feel a strange feeling, as if one's dream was completely taken away. This is quite different from not having any memory of a dream. This liquid, which the succubus robbed, is dissolved into the body of the succubus and is composed.
(Thanks Darkstalkopedia)

Here's for more info:
http://darkstalkers.wikia.com/wiki/Morrigan_Aensland