Editing Trap

{{Quality|Exceptional|17:58, 26 March 2015 (UTC)}}
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: ''For information on trapping [[vermin]], see [[animal trap]].''
: ''For complex, multi-tile configurations, see [[trap design]].''

[[File:stone_fall_trap.png|thumb|230px|right|Real inconspicuous.]]'''Traps''' are a relatively quick and easy method of defending a fortress. Unlike [[soldier]]s, they're always on duty, and, once set up, need less management. On the other hand, they are immobile and can only lie in wait for foes to walk over them. Traps can be built from the {{k|b}}uild->{{k|T}}raps/Levers menu. Most traps need one [[mechanism]], a dwarf with the [[mechanic]] labor designated (more [[skill]]ed mechanics take less time to build a trap), and at least one other component depending on the type of trap – a stone, a cage, or one or more weapons. They can be built indoors or outdoors on a vacant [[floor]] (natural or constructed). Traps will block the passage of [[caravan]] wagons.

Stone-fall, weapon and cage traps will be triggered by most hostile entities entering their tile, with the possible exception of [[thief|thieves]], flying creatures and other [[Forgotten beast|occasional]] [[Titan|fun]] [[Demon|surprises]]. Any [[unconscious]] creature will trigger traps, including your own dwarves. Conscious dwarves do not set off self-triggered traps.

Note that only dwarves with the mechanic labor enabled will reload cage, stone, or weapon traps. In combat situations, [[mechanic]]s have a nasty habit of wanting to reload (or clean) traps when they are triggered, regardless of who or what might be near them. [[Forbid]]ding traps after they are built will keep [[Urist|Urist McSuicide]] from deciding to reload a trap in the middle of a [[siege]]. Just remember to unforbid them when things calm down, so the traps are all ready for next time. Note that forbidding a trap after it has been triggered doesn't help, as the job to refill the trap has already been issued in that case, so a mechanic will carry a stone out to the trap anyway. Alternatively, simply order your dwarves to stay within a safe [[burrow]] until any threats have been dealt with.  If a cage trap has captured something while forbidden and been left alone for an extended period of time (nearly a year or longer) the caged individual escapes and you will get the announcement "Something has emptied a cage!". If put into a stockpile or claimed, captured individuals will be prevented from escaping.

It is possible to determine the state of a trap (loaded/unloaded) and the components it contains using the {{K|t}} query.

Traps can be deconstructed by pressing {{k|t}} to view the trap (or {{k|q}}, although the name of the trap will not be displayed until it is flagged for removal), followed by {{k|x}} to remove it. Deconstructing a trap leaves the components used in its creation on the ground around the tile.  Traps destroyed by hostile action may return damaged objects.

=== Stone-fall trap ===
The simplest trap to construct, a stone-fall trap is essentially a [[stone]] suspended up in the air which is dropped on intruders when the trap is triggered. These are a popular defensive measure early on, as the components needed are readily available as soon as you start mining. A single stone trap will usually '''not''' severely wound or kill most animals and enemies, but can break a bone, which gives you more than enough time and advantage to finish them off with [[military]]. The [[density|weight]] of the stone used in the trap affects the amount of damage the trap does, but it can be difficult to get your dwarves to use heavier stones, like [[galena]] or [[cinnabar]], when loading the traps.  Patient micromanaging from the {{k|z}}/stock menu and/or using {{k|f}}orbid often does the trick.

After each use, a stone-fall trap needs to be reloaded with another stone. This is done by any [[dwarf]] with [[mechanic]] [[skill]] enabled, a task which your dwarves will see to automatically. The dwarf will generally not use the stone that just dropped, but a new one (would you want to put your hands on that gory mess?). Being that stonefall traps do '''not''' alert you of ambushes when triggered by hidden invaders* (the way cage traps do), and ''automatically'' trigger a "reload" job, this can frequently lead your mechanics into peril.  You can make your mechanics' lives a lot easier and longer if you disable that labor during sieges or burrow them away from the enemy.

: ''(* For something a bit more complex but quite elegant that will notify you, see [[Trap_design#Land_mines]])''

Stone-fall traps respect [[economic stone]] restrictions, and they can not be loaded with [[clay]].

Before you write off stone-fall traps as worse versions of weapon traps (see next), note that weapon traps require you to have previously made, [[goblinite|found]], or [[caravan|traded]] for [[weapon]]s, making them more of an option somewhat later in the game. A stone-fall trap only requires a mechanism and a stone.

*Shortcut {{k|b}} {{k|T}} {{k|s}}
*Components used: [[mechanism]] and an ordinary [[stone]]
*Appearance: {{Raw Tile|^|7:1}} = ready, {{Raw Tile|^|7:0}} = no stone loaded

=== Weapon trap ===
Weapon traps are similar in nature to stone-fall traps, and are triggered when any hostile creature steps on the trap. They contain between one and ten weapons, and can inflict grievous injuries. However, it takes time for the trap's weapons to trigger; enemies who move quickly across the trap may survive unscathed, as the weapons will not hit a creature which has moved off the trap.

When placing the trap you will be asked for a type of mechanism as normal, then asked to select weapons to use. The [[quality]] of a trap's mechanism influences the attack rolls of its weapons.[http://www.bay12forums.com/smf/index.php?topic=14461.msg131214#msg131214]. At this point you will get a list of all stockpiled weapons in your fortress. {{k|+}}{{k|-}} will select different weapons and pressing "Enter/Return" adds 1 of the selected weapon to the trap; you can e{{k|x}}pand the selection to choose more carefully. Up to 10 weapons can be put in each trap and all weapons in the trap will attack at once when it is triggered. When happy with your weapon selection press {{k|d}} to set the trap.

Any weapon can be used, including poor-[[quality]] efforts by your weaponsmith, training weapons, and any non-dwarf weapons you have traded for or recovered from dead [[goblin]]s. Think of it as fair retribution when goblins are sliced to pieces by their own axes!

If you add a [[crossbow]]* to a weapon trap, you must also include [[bolts]]. One bolt (per crossbow) will be fired each time the trap is triggered, and when those run out, the trap will signal a "reload" order.  A crossbow without bolts will not fire.

(* Bows will also work in weapon traps, but that weapon will need to stay loaded with [[arrow]]s, which dwarves cannot produce.  But it certainly is one use for all those arrows you've collected.)

You can also use the corkscrews that are normally used in [[screw pump]]s, or any of the other specialized trap-only weapons:

[[Metalsmith's forge]]
*menacing <metal> spike
*large, serrated <metal> disc
*spiked <metal> ball
*enormous <metal> corkscrew
*giant <metal> axe blade

[[Carpenter's workshop]]
*menacing <wooden> spike
*spiked <wooden> ball
*enormous <wooden> corkscrew

[[Glass furnace]]
*menacing <glass> spike
*large, serrated <glass> disc
*spiked <glass> ball
*enormous <glass> corkscrew
*giant <glass> axe blade

:* Don't know which to make? See [[Trap component]] for detailed information.

These "trap only" weapons have all the material property advantages and disadvantages that normal weapons have, though they're massively less durable. It should be noted that the trap weapons are larger than normal dwarf weapons, meaning they should be more effective than normal weapons made of equivalent materials. When triggered, this trap will "attack" the creature with all the weapons available to it, normally doing massive damage. This can also be ''very'' messy if the trap is loaded with cutting weapons, often creating an explosion of blood and dismembered body parts. Using blunt weapons reduces the mess somewhat, and you may wish to strategically place a [[User:Uristocrat/Dwarven_Bathtub | Dwarven Bathtub]] nearby. See [[Trap component]] for a full discussion.

Weapon traps do not require slightly suicidal mechanics to reset them after each triggering but instead reset automatically after an unknown period of time. However, there is a 50% chance that a kill will result in the victim getting stuck in the mechanism and cause the trap to jam (use {{k|t}} to check the trap), requiring a dwarf to remove the body. Whenever a trap jams, a mechanic will ''automatically'' attempt to clean it if they have a [[path]], so forbidding the body (or forbidding the trap's mechanism in advance) may be necessary to save him from the victim's friends. Note that weapon traps will only jam if they ''directly'' kill the creature – if they instead inflict a mortal wound and cause the creature to bleed out, they will not jam.

The triggering creature will defend from the trap's attacks just like from a dwarf's, by jumping away, dodging and blocking. This can be used in your favour if the trapped tile happens to be surrounded by pits.

*Shortcut: {{k|b}} {{k|T}} {{k|w}}
*Components used: [[mechanism]] and whatever [[weapon]]s you want, limit 10.
*Appearance: {{Raw Tile|^|4:1}} = ready, {{Raw Tile|^|4:0}} = jammed or out of ammo

=== Cage trap ===
Cage traps are different from the other trap types in that they do not directly kill or injure invaders. Instead, they capture the creature that triggers them in a [[cage]]. Despite the unfortunate lack of violence, this is still very effective as it completely neutralizes the target so that it can be dealt with later. After a creature is captured, it's stored in an animal [[stockpile]] if the current standing order is set ({{K|o}}-{{K|a}}). The trap will then be reset by [[hauling]] an empty cage to the trap's location. This is done ''automatically'', as in, during a siege, by any dwarf with the [[Mechanic]]s labor enabled. Cage traps will also alert you to ambushes when triggered by hidden invaders, making them a useful forward defense mechanism.

'''Most''' captured creatures do not require any nourishment and will survive being in a cage indefinitely; in fact, even submersion in water or magma appears to have no effect on caged creatures.  It is possible for dwarves to bring [[water]] to cages, but this will only occur if you have someone friendly also locked in the cage – like a dwarf child snatched by a goblin. See below for how to remove things from a cage.

'''Cage traps will not capture every creature in the game''', so you ''will'' need alternative defenses – [[titan]]s and [[forgotten beast]]s (as well as certain other types of creatures) are immune to traps entirely and will waltz right past all of your carefully placed cages unless the cage has a giant cave spider web on it. Some creatures are nimble enough to avoid setting off traps, or even escape it completely once triggered. A webbed cage trap '''will''' capture nearly anything ([[Fun|including even your own dwarves]]); the only creatures it cannot capture are those immune to both cage traps and webbing, such as a web-spinning forgotten beast or a dwarf from your fortress on a Collect Webs job.

Cage traps are also useful for catching wild animals. This can be done by simply placing traps in areas where wild animals roam (this does '''not''' require a dwarf with the [[trapping]] labor enabled). The captured animals can be tamed (and sometimes trained into war animals!) at any animal training zone. See [[Animal trainer]] for more on training animals.

In the process of taming a wild animal, there is a chance that seeds will be left in the cage. Dwarves ''only'' load empty cages into traps.  One way to remove the seeds and make the cage usable again is to {{K|d}}ump them. First loo{{K|k}} at the cage in your Animal [[stockpile]], then highlight the seed and press {{K|Enter}} to look at the seed, then press {{K|d}} to dump the seed.

*Shortcut: {{k|b}} {{k|T}} {{k|c}}
*Components used: [[mechanism]] and a [[cage]].
*Appearance: {{Raw Tile|^|2:1}} = ready, {{Raw Tile|^|2:0}} = no cage

The material a cage is made affects indirectly the speed at which it is assembled into the trap. Heavier cages take longer to assemble. The more skilled a dwarf is in the [[Mechanics]] skill, the less time he takes to assemble the cage.

With exception to the latter, cage material has no effect (beyond weight for hauling, value of finished trap, and the fact that [[elf]] merchants will get angry if the cage is wooden).  A glass terrarium is just as strong as a steel cage.

To release a creature from a cage, build the cage ({{k|b}} {{k|j}}) and use {{k|q}} to unassign it.  You can also simply assign the creature to a pasture or pit. To release a hostile creature (or wild animal) safely from a cage, build the cage and link the cage to a [[lever]] that can be remotely triggered. If you have many cages you need to empty out quickly see [[Mass pitting]].  Cages have no current limit to the amount of beasts you can put in them, so you can build one cage and assign all the beasts to that cage.  Typical caveats of dealing with wild/hostile animals apply.

As with most traps, if a dwarf goes to sleep or is knocked unconscious over a cage trap, it will be triggered and the dwarf will be trapped. Unlike usual creatures, a caged dwarf can starve or die from dehydration.

=== Upright spear/spike ===

The previous 3 types of traps trigger when a hostile creature steps on them.  An upright spear/spike trap is different – it must be triggered externally to cause the spears or spikes to spring up or to recede back down.  Unlike the other traps, the spike trap ''does not discriminate between friend or foe'' – when the spears/spikes spring up, ''any'' creature on that tile will be subject to possible impalement by them.  Note that this trap only does damage [[Time|at the exact moment]] that the spikes spring up – once up, they do nothing (unless something falls on them from a height) until they come up again.

If you simply want upright spikes on a tile, placing the upright spear/spike trap does not require a mechanism and it does not require the Mechanic labor.  Static spikes only require 1 to 10 [[Weapon|spears]] or [[Trap component|spikes]].  Without a link, the trap will not operate, but can still do additional damage to anything that falls on that tile (see below).

Linking it to a [[lever]] or a [[pressure plate]] ''will'' require a mechanism and must be performed by a Mechanic.  Linking the spikes to better [[quality]] mechanisms increases the chance to hit the target.  Retracting the spears/spikes does not require space in the [[z-level]] below the trap. Spike traps do not jam.

When linked to a lever or pressure plate, a <u>close</u> signal will cause them to spring up, while an <u>open</u> signal will cause the spears or spikes to recede.  Most [[repeater]]s do not cycle very quickly, so, with only 1 trap, it is easily possible for a unit to walk onto the trap tile after it has sprung up (and is harmless) and then on past it before it goes down and comes up again – multiple traps in a row can be a good idea.

At the risk of stating the obvious, if you plan to recover the bodies or [[goblinite]] left by victims of an automated spike trap, you should also plan some way to turn them off during that recovery.  [[Unfortunate accident|Or not]].

An often overlooked ability of an upright spike trap is that it also inflicts damage on a creature that falls onto it while it is deployed.  And since they are built in the deployed state they can be quickly built to make a pit trap more lethal, without the need for extra mechanisms.  However, you will still need some way to cause your victims to fall onto the spike from above in the first place, and the pit must be more than 1 z level deep for the spikes to cause damage.

*Shortcut: {{k|b}} {{k|T}} {{k|S}}
*Components used: 1-10 spears or spikes, plus further [[mechanism]]s for linking to triggers.
*Appearance: {{Raw Tile|{{!}}|0:1}} = extended, {{Raw Tile|.|7:0}} = retracted

== Mechanism quality ==

All of the above traps other than Upright Spear use mechanisms in their construction.  The quality of the mechanism used impacts weapon traps beyond their value. However, in weapon traps the mechanism quality seems to act similarly to weapon skill in an entity and will play a part in determining whether a strike lands.  Code analysis suggests that mechanism quality also impacts the effectiveness of stone fall traps, though it has no effect on cage traps.

==Trap management==

Making mechanisms, setting up traps, and constructing a variety of other buildings all require the mechanics skill. Only mechanisms have a quality level so it's a good idea to enable mechanic on the general work force of your fort and restrict mechanic workshops to skilled workers with the profile manager. Clogged traps and triggered cages will generate a "load trap" or "clean trap" labor even if said traps are forbidden. This could quickly send your dwarves into a danger zone as they go to maintain it. This can be prevented by drawing a burrow around said traps, assigning no one to it, and toggling the burrow to restrict all workshops on it to the burrow. Strangely this will also work for the traps (likely because the behaviors that check for jobs is not building-specific, but area-specific, so all jobs generated in the area must be undertaken by those in the burrow). Your dwarves will not touch the traps until the burrow is unrestricted.

==Other traps==
You can create [[trap design|even more elaborate traps]] with imaginative use of pits, [[pressure plate]]s, [[lever]]s, [[grate]]s, [[support]]s, [[water]], and/or [[magma]], creating sacrificial altars (blood for the Blood God!) and whatever else you can think of.  Watching those goblins try to find a way out of your drowning chamber as it begins to fill is really quite satisfying.  These are best made in a large, repeatable mass killing way. If you make a trap that kills 10 or so goblins that only works once and you have to rebuild it, wasting time you don't have during a [[siege]], then you're not <s>trying hard enough</s> having too much [[fun]].

==See also==
*[[Trap design]]
*[[Mass pitting]]

{{Translation
| dwarven = ïggal
| elvish  = abola
| goblin  = stoslo
| human   = losric
}}

{{buildings}}
{{Category|Traps}}