Difference between revisions of "IED trap"

Latest revision as of 00:13, 12 September 2023

IED traps ("improvised explosive device" traps) are artisanal landmines made out of high-explosive shells.

Acquisition[edit]

IED traps can be constructed once the Ieds research project has been completed. They require 2 High-explosive shells, 1,400 ticks (23.33 secs) of work, and a Construction skill of 3.

Summary[edit]

Traps are single use security buildings that may be triggered when a pawn of any kind walks over it.

The base trigger chance is 100% for enemies, including mechanoids and animals affected by the manhunter mental state. Note that despite the name, animals currently hunting a human pawn for food are not "manhunters" and are not considered enemies.
Non-manhunting wild animals have a 25% chance to trigger the trap.
Colonists and tame animals have 0.4% (one in 250) chance to trigger the trap.^{[Friendly Mechanoids?]}
Friendly visitors and their animals will never trigger a trap.

However, colonists and non-manhunting animals are aware of the location of traps, and will avoid pathing over them if reasonably practical.^{[Path Cost?]} One notable exception is roped animals being dragged by a handler - the rope limits their movement, overriding their usual behavior.

Prisoners are considered to be their original faction for the purposes of traps. Enemy who you have taken prisoner will retain their 100% trap trigger rate and will ignore traps when pathfinding. Colonists that you have taken prisoner retain their 0.4% trap trigger rate, even during a prison break, and will avoid traps whenever possible.

In all instances, the nimble trait multiplies the trigger chance for that pawn by 10%, that is, a 10% chance for enemies and 0.04% chance for friendly pawns.
IEDs can also be triggered when hit by a projectile dealing the Bullet, Arrow, or ArrowHighVelocity damage type, or when damaged below 20% of their maximum HP.

When triggered, the trap will begin to spark and emit a hissing sound for 15 ticks (0.25 secs) before exploding, dealing 50 Bomb damage in a 3.9-tile radius. Bomb damage has additional damage multipliers depending on the target, see Bomb for details.

Non-drafted pawns will attempt to run from an activated IED trap.^[Verify]

Analysis[edit]

It is inadvisable to place them in the open, as manhunting animals could trigger them. Colonists, friendlies and sane animals are aware of placed traps and will walk around them, but only if another short route is available. Pawns will not be able to avoid traps placed in a long continuous line, or in choke points like a narrow hallway. A trap is less likely to be triggered by a colonist or friendly (0.4% chance).

Placement requires some forethought by guessing positions where the enemies will be stuck for a couple of seconds such as cover spots (rocks or walls) and choke points on the side where enemies would take cover when engaging your colonists. Example: an IED trap surrounded by a tile or two of sandbags will explode while victims are still close due to the reduced movement speed to walk out over them.

As a detonator[edit]

IED traps can be triggered by shooting at them, so they can be placed near other high-explosive shells to make a bigger explosion, to destroy crashed ship parts for example.

Here, a dozen of high-explosive shells are placed near a defoliator ship (1200 HP), along with an IED trap.

It requires a bit of micro-management to place individual stacks of shells (make the shell at a machining table, carry it to a 1×1 stockpile zone, delete this zone to avoid having more shells on it, repeat), and a careful placement of the trap (placing it too close to a mecha will wake it up), but the explosion will destroy the defoliator outright. The pawn shooting at the IED trap should be ready to run very fast, or better: wear a jump pack to avoid being sliced up by the waking mechas.

Unfortunately, a stack of 12 shells doesn't make the same damage as 12 stacks of one, so individual stacks have to be made (in fact, a stack of 25 shells exploding brings the defoliator to 725/1200, not even half the damage for more than twice the amount of shells).

This technique works well to destroy ship parts, or possibly sleeping scythers that accompany it, but killing centipedes would require much more shells and is clearly not the best method: kiting them is much easier.

Roof Fall Trap[edit]

Since the IED deals bomb damage, building a large roof supported by a single wooden wall within range of an IED can cause a roof collapse when the IED is triggered, which can deal additional damage in a much larger area for a low additional cost.

Version history[edit]

0.11.877 - Added.
1.1.0 - IEDs explode when bullets hit them. This allows the player to purposefully shoot them to set them off.

Architect

Security: Barricade • Sandbags • Spike trap
(research): Autocannon turret • Foam turret • Mini-turret • Rocketswarm launcher • Uranium slug turret • Mortar
IEDs: IED trap • IED incendiary trap • IED EMP trap • IED firefoam trap • IED smoke trap • IED antigrain warhead trap • IED tox trap • IED deadlife trap
Related: Antigrain warhead • EMP shell • Firefoam shell • High-explosive shell • Incendiary shell • Smoke shell • Tox shell • Deadlife shell

@@ Line 1: / Line 1: @@
-<onlyinclude>{{infobox main|security|
+{{Image wanted|reason=Images of AoE in a style similar to [[:File:Skip shield radius.jpg]]}}{{infobox main|security|
 |name = IED trap
-|image = IED_trap.png
+|image = IED high explosive.png
-|description = An artillery shell connected to a homemade trigger. When someone disturbs the trigger, the shell explodes. The improvised trigger has a random delay that might allow a nimble enemy to escape.
+|description = A pair of high-explosive shells connected to a trigger which detonates on touch or bullet impact. Since it is hidden in the surrounding terrain, it cannot be placed adjacent to other traps. Animals can sense these when calm.
-|type = Security
+|type = Building
-|placeable = Yes
+|type2 = Security
-|size = 1||1
+|placeable = true
+|minifiable = true
+|size = 1 ˣ 1
+|mass base = 2
+|flammability = 1
 |hp = 40
-|buy = {{icon|component|1}} {{icon|shell|1}}
+|sell price multiplier = 0.7
-|sell = {{icon|metal|38}}
 |beauty = -4
-}}</onlyinclude>
+|terrain affordance = light
+|research = IEDs
+|thingCategories = BuildingsSecurity
+|skill 1 = Construction
+|skill 1 level = 3
+|work to make = 1400
+|resource 1 = High-explosive shell
+|resource 1 amount = 2
+|deconstructable = false
+|destroyyield = nothing
+}}
+'''IED traps''' ("improvised explosive device" traps) are artisanal landmines made out of [[high-explosive shell]]s.
-The IED trap explodes in a 5-tile radius shortly after an enemy had walked over it, dealing 50 explosive blunt damage to any body part. This gives it a fair chance to incapacitate and a small chance to kill a pawn. When tripped, it will start emitting a hissing sound hinting enemies to run away and because of the delay, single placings may prove useless but chained each other within blast radius can guarantee effectiveness at an expensive cost. It is worth noting that the [[IED incendiary trap]] triggers instantly, but deals less damage.
+== Acquisition ==
+IED traps can be constructed once the [[Research#{{P|Required Research}}|{{P|Required Research}}]] research project has been completed. They require {{Required Resources}}, {{Ticks|{{P|Work To Make}}}} of work, and a [[{{P|Skill 1}}]] skill of {{P|Skill 1 Level}}.
-== Strategy ==
+== Summary ==
+{{IED Note}}
-It is inadvisable to place in the open, as animals could trigger the trap instead of raiders. Colonists and friendlies are aware of placed traps and will walk around them, but only if another short route is available. Pawns will not be able to avoid traps placed in a long continuous line, or in choke points like a narrow hallway. A trap is less likely to be triggered by a colonist or friendly (0.4% chance), but it's still best to not take that chance to begin with.
+When triggered, the trap will begin to spark and emit a hissing sound for {{ticks|15}} before exploding, dealing 50 [[Bomb]] damage in a 3.9-tile radius. Bomb damage has additional damage multipliers depending on the target, see [[Bomb]] for details.
-Placement requires some forethought, such as guessing positions where the enemies will be stuck for a couple of seconds and thus unable to retreat in time; for example, if they had to walk over a tile or two of [[Sandbags|sandbags]] to reach the trap, it would explode long before they could run away due to the reduced movement speed they would suffer.
+Non-drafted pawns will attempt to run from an activated IED trap.{{Check Tag|Verify|verify this fact}}
-A very useful and effective tactic is to intentionally place these traps behind cover like rocks or sandbags, on the side that enemies would take cover on when engaging your colonists. Enemy AI will cause raiders to seek the cover of rocks, trees or walls, and if IED traps are waiting for them, they will get a very nasty surprise when the landmine explodes. Be warned that the damage from the trap will usually not be enough to destroy the cover (unless you pre-damaged it yourself), so enemies may still be able to use it after the trap has done its job.
+== Analysis ==
+It is inadvisable to place them in the open, as manhunting animals could trigger them. Colonists, friendlies and sane animals are aware of placed traps and will walk around them, but only if another short route is available. Pawns will not be able to avoid traps placed in a long continuous line, or in choke points like a narrow hallway. A trap is less likely to be triggered by a colonist or friendly (0.4% chance).
+Placement requires some forethought by guessing positions where the enemies will be stuck for a couple of seconds such as cover spots (rocks or walls) and choke points on the side where enemies would take cover when engaging your colonists. Example: an IED trap surrounded by a tile or two of [[sandbags]] will explode while victims are still close due to the reduced movement speed to walk out over them.
+=== As a detonator ===
+IED traps can be triggered by shooting at them, so they can be placed near other [[high-explosive shell]]s to make a bigger explosion, to destroy [[crashed ship parts]] for example.
+[[File:Bombing a defoliator.png|center|400px]]
+Here, a dozen of high-explosive shells are placed near a [[Crashed ship parts#Defoliator ship|defoliator ship]] (1200 HP), along with an IED trap.
+It requires a bit of micro-management to place individual stacks of shells (make the shell at a [[machining table]], carry it to a 1×1 [[stockpile zone]], delete this zone to avoid having more shells on it, repeat), and a careful placement of the trap (placing it too close to a mecha will wake it up), but the explosion will destroy the defoliator outright. The pawn shooting at the IED trap should be ready to run very fast, or better: wear a [[jump pack]]{{RoyaltyIcon}} to avoid being sliced up by the waking mechas.
+Unfortunately, a stack of 12 shells doesn't make the same damage as 12 stacks of one, so individual stacks have to be made (in fact, a stack of 25 shells exploding brings the defoliator to 725/1200, not even half the damage for more than twice the amount of shells).
+This technique works well to destroy ship parts, or possibly sleeping [[scyther]]s that accompany it, but killing [[centipede]]s would require much more shells and is clearly not the best method: kiting them is much easier.
+=== Roof Fall Trap ===
+Since the IED deals bomb damage, building a large roof supported by a single wooden wall within range of an IED can cause a [[Roof#Roof collapse|roof collapse]] when the IED is triggered, which can deal additional damage in a much larger area for a low additional cost.
+== Version history ==
+* [[Version/0.11.877|0.11.877]] - Added.
+* [[Version/1.1.0|1.1.0]] - IEDs explode when bullets hit them. This allows the player to purposefully shoot them to set them off.
 {{nav|security|wide}}
-[[Category:Security]]
+[[Category:Security]] [[Category:Trap]]