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The animated dead (or undead)
Ñ are the bodies of formerly living creatures animated through fell magic. These night creatures can be created intentionally by a necromancer to serve him, or arise naturally from the dark energies of evil regions.
 What is an undead?
An undead may be formed of either the rotting husk or the bones and shell of a being. The former is considered a zombie, and the latter a skeleton. Although vampires are no longer performing the bodily functions of a living being, they are not considered the "animated dead", this term being reserved for a corpse which has begun to move and act on its own or by the will of another, but lacking any form of intelligence beyond a primitive urge to hunt and kill any living thing it can find. Where zombies and skeletons cannot think or behave in any sophisticated manner beyond "kill everything", vampires are willful beings, generally indistinguishable from living persons (and capable of great deception to ensure that nobody learns about their condition). Ghosts are called Undead in-game, but they are also not considered animated dead (as they lack a corporeal form).
As long as the remains of a creature contain a body part capable of grasping, be it a hand or head or the entire upper half, those remains can be animated. This can lead to animated hands and heads, which seems comical until you consider the implications of a swarm of such monstrosities and the havoc that they might wreak. Even some parts of creatures which should be incapable of autonomous movement can be raised, such as the hair or skin. They are, however, predictably nonlethal, mostly serving as a B-movie terror monster to scare your dwarves into running around. A body part can be resurrected as a zombie even if it has already done so and been de-animated again. However, collapsing, pulping or goring the head, lower body, or upper body, ensures that the zombie cannot rise up again, as does damage from extreme heat. Likewise, destroying the structural integrity of an animate body-part will stop its reanimation.
Upon animation, an undead gains a syndrome that fundamentally changes its physical characteristics and behaviour. Some of the traits they generally possess are:
- Severely increased strength and toughness and reduced speed;
- Opposition to life;
- Lack of emotion, pain, thought, or need for sustenance or breath;
- Undead status (NOT_LIVING), sterility, and inability to attribute rust or gain.
Undead retain the wounds that killed them in life, as well as any they have sustained since or from a temporary de-animation. Undead vary in levels of strength depending on their form. Certain types of animal are likely the most dangerous that it is common to encounter, and can have dangerous strength, speed, aggression, and piercing attacks. The undead of butcherable creatures can still be butchered once de-animated, as long as they have not rotted; doing so will prevent them from re-animating again, though their untanned skins and hair can potentially become undead.
Larger undead with the BUILDINGDESTROYER tag can still destroy buildings, though undead with special attacks like webbing will not be able to use them. Undead thieves can still pick locks, but will not path to a locked door unless in pursuit of the living. If found underground, undead will usually path into a fort if they can.
 Thralls, Husks, and Zombies
Certain kinds of evil weather can instantly turn any syndrome-vulnerable creature into a bloodthirsty undead killer, opposed to all life. These creatures are referred to be the sort of weather that transformed them, an identifier as a thrall, husk, or zombie, and their original creature name-- for example, a stray guineahen unholy gloom husk. The specific procedurally generated syndromes of thralling evil clouds are functionally identical to that of animate dead, with the same extreme gains in physical stats, lack of pain or breath, etc.
Because the interaction can happen without first killing the target, thrall-like creatures retain any armor or weapons they were carrying. Perhaps worst of all, they may still be contaminated with the material leading to the transformation, infecting those with whom they wrestle.
Morale is possibly the biggest obstacle to directly confronting a zombie horde. Without enough discipline, a troop sent to fight them may instead decide to flee in terror from such abominations of nature. As you may imagine, this can lead to endless amounts of Fun, for unlike your dwarves, the undead cannot feel fear or any other emotion, and any dead dwarves may in turn rise up into more zombies. It is important that any undead-fighting squad consists of severely hardened and disciplined soldiers. Any soldiers you bring to embark on an evil biome should have at least two points in discipline, as morale is currently buggy and leads to ordinary dwarves fleeing even from living wildlifeBug:7161. This may also be worked around with a little modding, by adding at least [NATURAL_SKILL:DISCIPLINE:1] to all civilised races and trainable pets.
The combat itself can also be quite fun. They are far greater in strength and durability than the living, feel no pain, and have no useful articulations to damage. You would not wish to attempt to kill them with puncture wounds for this reason, and likewise, choking is ineffective against their lack of breath. They can only be killed by tearing them asunder (bisection), beheading, or pulping an important structural body-part. Blunt weapons are effective weapons to use for animate corpses, for they are not only less likely to sever off parts for further reanimation, but are likely to inflict pulping damage, mangling the zombies so badly that they cannot rise up again. Of those available to dwarves, maces are more efficient at pulping than warhammers. Flails are better still, if one can acquire them. Axes and swords can cut apart the physical form of the undead; this, however, may be dangerous if the source of reanimation is still active and present, as the more body parts are about, the more fodder for animation is present. In this case, it is wiser to either butcher the corpses (if they can be butchered), throw them into magma, or pulverise them with a drawbridge, which will destroy the bodies so thoroughly that they cannot be reanimated again. A thrall may be "safely" fought with cutting weapons however, as long as there is no risk of infection at hand. Undead animals can be disposed of by cage-trapping them and trading them away to passing
Undead from necromancer sieges should be treated with far more caution, as they can carry equipment. These are exceedingly dangerous, for their already heightened strength and toughness are further augmented by weapons-grade metal. You may want to eschew direct combat altogether in this situation, especially as necromancer sieges already tend to summon the walking dead in pages of a hundred, and one is enough to rout an entire squad.
Evil weather thralls may also require utmost caution. Any thrall carrying a melee weapon or armour can dispatch a full squad in short order even with average combat skills, making direct confrontation an unwise choice. A particularly dire possibility is that, if the responsible evil cloud is in dust form, the thrall is still contaminated with whatever substance transformed it. If this is the case, any dwarves sent to fight the thrall will become thralls themselves if the thrall tries to wrestle them. From there, the new thralls might spread the contaminant further still, which can easily lead to a full-fledged zombie apocalypse.
In these and other dire cases, it is often better to not fight them directly at all, instead resorting to traps, atom smashers and other indirect ways to neutralise them. Magma, that classic solution to all dwarven problems, is another effective weapon, as is fire in general. The sheer heat of magma will eventually destroy the corpse, rendering it unable to rise again. Magma kills zombies fairly slowly though.
Reports have been made of zombies animated by the ambient evil of a region deanimating on their own when wandering away from such a vile place.
 Undead Fun Facts
- Undead can animate from hauled corpses.
- Undead will not attack vampires.
- Undead will not attack inorganic enemies like the bronze colossus.
- Undead risen from starved animals in cages are not caged.
- Undead attack all organic megabeasts as well as invaders, except necromancers (as their sorcery allows them to control undead easily).
- Creatures capable of evading traps or bypassing locked doors retain that ability as undead.
- Enthralled dwarves from your fortress are not affected by traps.
- Dwarves who like an animal will also enjoy that undead animal.
Dwarves will not report someone missing as dead even if the corpse is gnawing on their ear.
Animated creatures can somehow become stuck in mid-air, and will not move at all, even if killed. Spatters of blood from the animated party also float in this manner. This has been known to occur in cases ranging from a deer's animated head to a goblin's partial skeleton.