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The undead has been defined down the ages as an accursed body which cannot rest in the kindly earth, but nightly leaves its grave to prey on sleeping men and women through whom they are believed to maintain a semblance of life by sucking thence the warm blood of such victims while they sleep. Webster’s International Dictionary confirms that the undead is a “re-animated body of a dead person … believed to come from the grave and wander about by night sucking the blood of persons asleep causing death.” The Oxford Dictionary agrees with all the above, describing an undead as “a ghost that leaves his grave at night and sucks the blood of sleeping persons.” Sir James Frazer in the second volume of his work The Fear of the Dead in Primitive Religions (1934) is in no doubt that the undead are “malicious ghosts who issue from their graves to suck the blood of the living, and stringent measures are deemed necessary to hinder or arrest this horrible proceeding.” They are, of course, demonic. In certain circumstances (though these are few and far between) those who expire from the parasitic undead's visitations and quaffing of their life-blood will themselves be at risk of becoming undead in their turn. This does not occur where the person is in a state of grace; where any mortal sin that stains their soul has been absolved. And by no means are the great majority of victims destined to return as undead. It would seem that those who become undead in this way are fewer than might be imagined. This nevertheless remains an enigma where probable candidates are those who have led a life of more than ordinary immorality and unbridled wickedness; where the individual has possessed a surfeit of selfish passions, evil ambitions and cruelty. Such undead, however, are thought to be those who have delighted in blood and devoted themselves during their life to the practice of diabolism and the black arts. Thus an undead is more likely to result from exceedingly base and cruel actions; especially where devil worship and devotion to the black arts has occurred. The supernatural agency is demonic and, whilst human beings cannot actually transform into demons themselves, they may be possessed by them, and thus appear transformed. In the case of contamination followed by expiry of a candidate there exists the possibility that their malevolence sets in action forces which might prove powerful for terror and destruction even beyond the grave. It is hardly to be supposed that such persons would rest undisturbed while it is less difficult to contemplate the existence of this hideous life in death where the demonic is extant and seemingly manifests itself as a corporeal form. The smallest drop of blood can be employed by a demonic entity, enabling the wraith to form in a tangible manner. Revenants are attracted to blood which allows them to effect their purpose. The ancient Israelites would not eat the blood of any flesh at all, because the life of the flesh is in the blood. The Hebrew word that translates as “life” in Deuteronomy 12: 23 (“Only be sure not to eat the blood, for the blood is the life”) also signifies “soul.” The undead partakes of the dark nature and mysterious qualities of both revenant and demon. The exorcist must always be mindful of these alarming characteristics - not least the undead's terrible blood lust - and must never go unprotected when putting himself at risk during operative field work. Manifestation via the blood is the undead’s means of metamorphosis into a form often indistiguishable from a corpse. Since the undead do not exist in time - they dwell in what I have described as "anti-time" (see The Vampire Hunter's Handbook, page 28; and The Highgate Vampire, page 101) - they will cast no shadow, nor will their reflection be seen in a mirror or water’s surface. The crucifix symbol itself is utterly abhorred by them, and indeed all forms of evil. The object and what it is made of does not possess any power, yet it is so strongly symbolic of the triumph of good over evil that it alone repels evil and whatever is an emissary of evil. However, when employed by a person the intent and faith of the person employing it is paramount. This might seem like a paradox. Christian items and holy places utterly repel evil people who oftentimes delight in their sacrilege. Likewise supernatural evil shuns these holy things. It is indubitably unwise for these sacred symbols to be adopted as mere fashion items. Similarly, of course, it is unwise in the extreme for diabolical symbols to be adopted and worn. So the power of the crucifix exists, but will be magnified one thousandfold when supported by faith. Exorcism does not "kill" the demonic agent. It rids our sphere or dimension of the supernatural predatory wraith. The corporeal host once exorcised obviously returns to its true state and is no longer plagued by the apparent supernatural ability to manifest as though it were living.
“Whether we are justified in supposing that cases of vampirism are less frequent today than in past centuries, I am far from certain. But one thing is plain ~ not that they do not occur, but that they are carefully hushed up and stifled.” - Montague Summers (The Vampire in Europe, 1929).
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Christian items and holy places utterly repel evil people who oftentimes delight in their sacrilege. Likewise supernatural evil shuns these holy things. .
Yes while this is usually the case. there are exceptions. Don't these exceptions, disprove this claim?