EMP shell
 | This page could use some more or updated images. You can help RimWorld Wiki by uploading images to make this page better. Note: Images of fired AoE and one of stack AoE (1 shell and full stack designated by color) in a style similar to File:Skip shield radius.jpg. |
EMP shell
A shell filled with batteries and antennas, for generating an electromagnetic pulse when detonated. Electromagnetic pulses temporarily disable electrical devices and mechanoids. Can be fired from mortars or installed as a trap. Explodes when damaged.
Base Stats
- Type
- Crafted Resources – Mortar shell
- Tech Level
- Industrial
- Market Value
- 55
- Stack Limit
- 25
- Mass
- 1.25 kg
- HP
- 60
- Deterioration Rate
- 1.5
- Flammability
- 100%
- Path Cost
- 14
Ranged Combat
- Damage
- 50 dmg (EMP)
- Velocity
- 41 (m/s)
- Blast Radius
- 8.9
Creation
- Crafted At
- Required Research
- Microelectronics
- Skill Required
- Crafting 4
- Work To Make
- 800 ticks (13.33 secs)
- Resources to make
15 + 
2
- defName
- Shell_EMP
- thingCategories
- MortarShells
- tradeTags
- MortarShell
The EMP shell is a type of mortar shell that upon exploding, releases an EMP burst.
Acquisition
EMP shells can be crafted at a Machining table once the Microelectronics research project has been completed. They require 15 Steel, 2 Components, 800 ticks (13.33 secs) of work, and a Crafting skill of 4. The steel cost is increased to 25 if the Classic Mortars difficulty option is enabled.
They can also be purchased from traders.
Usage
| Product | Ingredients | Type [ExpandCollapse] |
|---|---|---|
 IED EMP trap
|
 2
|
Building - Security |
Summary
When fired from a mortar, emp shells deal 50 EMP damage in a 8.9 tile radius, stunning mechanoids, turrets and other mortars for 25 seconds, and instantly but temporarily downing shield belts, low-shield packs 
, mech low-shields, and mech high-shields.
After being stunned, mechanoids become 'Adapted' and gain immunity against further stuns for 2,200 ticks (36.67 secs). Immunity is applied on stun, and will not be extended by stunning an adapted or already stunned mechanoid.
When damaged beyond 70% of its health, it will explode after between 30 ticks (0.5 secs) and 60 ticks (1 sec), dealing 50 EMP damage in a radius around itself. The radius depends on the quantity in the stack, with a single shell covering a 11.9 tile radius, and expanding this radius proportional to the square root of the stack size times 0.4 up to a maximum radius of 15 tiles at a full stack of 25.
They are also used in the construction of IED EMP traps.
Analysis
It is a niche weapon that is extremely good at whatever it does- downing shields and stunning mechanoids. Its blast radius is much larger than regular high-explosive shells, so only a few shells are required per barrage. Because of this, it finds good value even though it deals no physical damage whatsoever. Given that, as well as its combat effectiveness, it is a very cost-efficient choice - despite requiring components to make.
EMP shells are required to down mech high-shields from a distance, so that other mortars can fire. The shield stun isn't enough for the same mortar to fire an EMP shell, then fire a mortar shell. Therefore, 2 (or more) separate mortars must be used together, with the EMP shell firing slightly before the others.
The radius from an exploding EMP shell is significantly larger than that of a fired EMP shell. Depending on the purpose, placing a single shell and causing it to explode may be more efficient than firing it from a mortar.
Gallery
One EMP shell
Partial stack
Full stack
Version history
- 1.1 - crafting cost was increased (20 --> 25 steel, 1 --> 2 components).
- 1.3.3066 - Steel requirement decreased from 25 -> 15 unless Classic Mortar difficulty option enabled.
- 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