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1.
Vampirism is the disease/ability described many ways throughout history creating Vampires. The main concept for vampirism can be someone who is drinking the blood of humans or animals, or someone draining the psychic energies of somebody else. Many sources tell of several accompanying attributes like fangs, pale skin, mild to severe allergy to sunlight, silver and garlic. Stories tell of ability to fly, shapeshift, about the need of coffins, immortality and vampires being living dead.

Many of these beliefs are myth or fiction but there lives a society claiming to be real vampires today, and they assert the following:

Vampirism is the disease or abilities related to vampires.
Vampirism can be conducted two ways. Either someone is turned (created by another vampire), or awakened (become one by him/herself in time). When someone shows the symptoms of being sensitive to sunlight, prefering to be awake during the night, having very acute senses, and instincts, somewhat resistant to common illness.. as well as having a thirst/hunger nothing seems to be able to ease, and an easily triggered 'secondary personality' the beast, who is violent, very temperamental, and impatient. V

Related to this community, vampirism DOESN'T mean immortality, death when contacting garlic, silver, or sunlight, blood tears, consumption of nothing but blood, sacred symbols are not lethal to- nor feared by vampires, they do show up in mirrors, they dont heal instantly, they are not all pale, not all beautiful, they're not all evil, and they dont live a secluded life away from human society.
A friend of mine conducted vampirism.
by [Sanguine] August 23, 2006
 
2.
Vampirism, A warcraft III Game, Where the vampires have to catch the peasants, When caught the peasant will be turned into a vampire, The game name - Vampirism
Hey guys, Lets go create vampirism and be peasents, we will win!

I'm going to go host vampirism.
by Me.... May 12, 2006
 
3.
The idiotic belief that one is a vampire.
Vampirism encourages dressing in dark clothes, filing some of your teeth to look like fangs, drinking another person's blood etc.

It also encorages certain ritals much the same as Satanism

"Can you believe Tori and Alisha are into Vampirism"

"That is foul dude, I heard they cut each other and drink eachother's blood, what losers"
by Glenn Griffiths August 21, 2006