Undead is the collective name for all types of supernatural entities that are deceased yet behave as if alive. Undead may be spiritual, such as ghosts, or corporeal, such as animated corpses. Undead are featured in the legends of most cultures and in many works of fiction, especially fantasy and horror fiction.
Bram Stoker was the first to use the term "The Un-Dead" as the original title for his novel Dracula. Stoker also uses the term in the novel.
Both legend and popular culture discuss various methods for creating undead creatures. Most involve the reanimation of a corpse, as with zombies, skeletons, and ghouls. Regarding ghosts, the spirit lives on after death, forming an intangible physical body that often mirrors the one the spirit had in life.
In some cases, the undead, especially skeletons and zombies, are under the control of a sorcerer. In other cases, such as zombies as depicted in film and vampires, the undead existence is passed on like a curse or disease. With liches, the powers of undead are sought after by the participant of a magical ritual that turns them from a living being to a lich. Ghosts are said to be kept in their undead state by willpower, either from a keen desire to remain with the living or from a wish to see something completed that they could not do during their lifetime.
Vampires traditionally can be killed by a stake through the heart or by decapitation, though various traditions have different means of dealing with them.
Zombies can often continue to attack when dismembered. To dispatch them, it may be necessary to destroy the head or to kill the person who reanimated them. Firearms, such as shotguns, may be effective against zombies.
Incorporeal undead are difficult to defend against because normal physical weapons pass harmlessly through their forms. In many video games and role-playing games, ghosts can only be dispatched by enchanted or silver weapons. However, in other fiction the only way to get rid of them permanently is to discover what duty or task they failed to complete in life (an example of this is found in Chapter 4 of The Monk by Matthew Gregory Lewis).
Undead are often depicted as vulnerable to sunlight and fire. They may also perish when their creator is likewise dispatched. Undead may be unable to cross certain symbolic boundaries or even natural barriers like running water.
In some cultures, various plants are said to repel the undead. Examples include garlic and wolfsbane, as well as rosewood, rowan, hazel, willow, and holly. This modern tradition appears to be based on pre-Christian belief that some plants are sacred.
Additionally, a line of salt is sometimes said to act as a barrier to the undead.
Undead are a popular adversary in fantasy and horror settings. They feature prominently in many role-playing games, computer role-playing games, MMORPGs and strategy games. In such games, special rules are often given for the undead.
In Dungeons & Dragons and similar systems, clerics can attempt to "turn" undead by invoking their patron deities or channeling "positive energy" (other-dimensional life energy). This forces the undead creature away from the cleric; powerful clerics are capable of completely destroying weaker undead creatures with this ability. Although the act of turning away the undead relies primarily on power of faith, a holy symbol is usually required as a focus for the divine power being invoked. This is derived from the traditional notion that vampires could be repelled by the cross. Clerics of evil gods can rebuke and control the undead in a similar fashion, by means of necromancy.
In Dungeons & Dragons and other games such as Final Fantasy, undead can be damaged by using magical effects that heal normal living beings.
In many games, including Diablo II, Necromancers have the ability to summon the undead from corpses.
Undead characters appear in many roles, be it a mindless horde of opponents (such as zombies or skeletons) or a thoughtful, plotting villain (such as vampires). Some games feature undead protagonists, such as The Masquerade.
In some stories and settings, such as the Lorien Trust LARP, the word "unliving" is used as a preferential synonym. In reference to the political correctness movement, the undead are sometimes jokingly referred to as the "living-impaired". Vampires were sometimes likewise referred to as "Undead Americans" by characters in the TV series Buffy the Vampire Slayer and the spin-off Angel.
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