23
$\begingroup$

I have a world set in the far future, no specific time for vagueness sake, that is completely war-torn by 2 warring factions. This planet is both sides' last stand, so it's all-out, no-limits warfare. Is there something that could potentially be use on the battlefield that would be noticeable, kill everyone instantly, but cause no bodily damage from the weapon itself? So no open wounds, burns, or the like. Exactly like they just dropped dead.

$\endgroup$
10
  • $\begingroup$ @EveninginGethsemane I'm visualizing no bodily damage from the weapon itself. So no open wounds, burns, or the like. Exactly like they just dropped dead. I'm guessing I could just do a massive radiation burst, as I don't plan on anything on that planet being left alive. $\endgroup$
    – ebhooks21
    Apr 22 at 16:52
  • 5
    $\begingroup$ How instantly you want the killing to occur? Chemical weapons can kill quickly, but not instantly. $\endgroup$
    – Alexander
    Apr 22 at 17:35
  • 3
    $\begingroup$ @ebhooks21 please update the question itself with important clarifications like that; don't just leave them in a comment. There's an edit button on the question when will let you change the text. $\endgroup$ Apr 22 at 17:37
  • 2
    $\begingroup$ "For the Angel of Death spread his wings on the blast, and breathed in the face of the foe as he passed; and the eyes of the sleepers waxed deadly and chill, and their hearts but once heaved, and for ever grew still!" (Lord Byron). $\endgroup$
    – AlexP
    Apr 22 at 18:32
  • 3
    $\begingroup$ @Alexander Sarin kills in one to ten minutes. I'm not sure how much of a hurry OP is in for everyone to drop dead, but it's basically like insect spray for people - it's pretty darned fast. $\endgroup$
    – J...
    Apr 23 at 12:12

18 Answers 18

26
$\begingroup$

If you had some way of efficiently generating neutral particle radiation without generating a whole load of gamma rays at the same time, you could make a neutron bomb that actually worked like people seem to imagine they do ("kills people but leaves buildings standing") rather than being a nuclear weapon optimized for use on heavily armored targets like tanks.

The problem would be generating an intense enough neutron flux that it could reliably and quickly kill people (presumably even people quite well protected) without causing major tissue damage or setting things on fire. It might be possible to do this if you could make miniature deuterium-tritium fusion bombs (pure fusion weapons are already a bit neutron-bomb-like). Detonating a tiny nuke is left as an exercise to the reader, but it might be possible to do with picogram amounts of antimatter and maybe a tiny amount of some kind of fissile like uranium or plutonium. The warheads would need to be carefully engineered to maximize useful neutron flux... possibly they're encased in a layer of beryllium and/or depleted uraniumthat can act as a neutron multiplier. Materials that can convert alpha particles from the fusion reaction into more neutrons would be useful too if you can find something suitable (maybe uranium nitrides or oxides). Fast fission of U-238 might add too much thermal energy and risk cooking things. Other more exotic materials like gold might allow increased gamma ray output, but that too risks cooking things or developing a fireball with all the resultant blast damage that implies. X-ray transparent materials (like beryllium) on the top, and x-ray reflective materials (like uranium) underneath might be a good arrangement, but I Am Not A Nuclear Weapon Engineer so I can't give useful advice here ;-)

The warheads are delivered across a wide area from something a little like a cluster bomb, but each one is attached to a "smart" guidance and propulsion system to allow controlled descents so that they can perfectly synchronize their spacing and altitude and detonation times... they all need to go off at once, because the radiation flux will cause any remaining devices to fail or detonate at the wrong altitude, and you want all devices to go off at an optimum height above the terrain to maximize neutron and gamma radiation flux but minimize thermal and blast effects.

Now, if this does work, then you can deliver a dose of radiation across the battlefield in one giant pulse that should immediately incapacitate everyone. I say incapacitate because instant death might require a flux so high that you'd probably burn and blast things to bits, but a high enough dose will simply scramble the brains of victims who will fall over trying to work out what just happened and why their muscles don't work properly anymore and then quietly die where they lay a few minutes later.

$\endgroup$
4
  • $\begingroup$ Comments are not for extended discussion; this conversation has been moved to chat. $\endgroup$
    – L.Dutch
    Apr 25 at 8:45
  • 1
    $\begingroup$ Radiation poisoning even in very high doses doesn't kill instantly, I can't even imagine the energy required to produce enough radiation to fry somebdy to the point they are incapacitated or killed instantly, it's so high that the skin of everybody will just become a blob of liquid and fall instantly. So this answer just doesn't fit $\endgroup$
    – Tofandel
    Apr 25 at 11:19
  • 1
    $\begingroup$ @Tofandel I literally said in my answer "immediately incapacitate everyone. I say incapacitate because instant death might require a flux so high that you'd probably burn and blast things to bits". Disruption of the central nervous system by intense radiation is very much a thing that can happen, resulting in unconsciousness and seizures. Nobody will be getting back up again. $\endgroup$ Apr 25 at 12:38
  • $\begingroup$ And the whole area will become radioactive. Bombarding a place with neutrons means creating loads of unstable isotopes. $\endgroup$ Apr 25 at 13:53
52
$\begingroup$

Massive carbon dioxide flood

This would work like a limnic eruption such as killed nearly two thousand people at Lake Nyos, and also many animals. People suffocated, and it was noted at the time that it looked like a neutron bomb attack.

$\endgroup$
2
  • 2
    $\begingroup$ Oh, that's just perfect! $\endgroup$
    – Bergi
    Apr 23 at 2:52
  • $\begingroup$ Damn, you beat me to it. :) $\endgroup$ Apr 23 at 4:14
23
$\begingroup$

Kill Switch

enter image description here

In the distant future, the Facebook Pepsi Corporation covers five eights of the planet.

Every child is fitted with a Facebook Pepsi "Hornet" implant at the base of their spine to allow them wirelessly access the Metaverse, and also remotely enjoy the silky smooth taste of Pepsi Brand Cola.

The implant receives a wireless signal and transmits it to the brain as sensory data. It also broadcasts brain functions back to the Mothership.

For data protection reasons the implant has access to all of the body's critical systems. This is all contained in the GDPR legislation article 89 Subsection 3b.

One bonus feature is that shutting down the implant also shuts down all brain function. The shutdown can be done wirelessly if you have the access code. There's your weapon.

$\endgroup$
11
  • $\begingroup$ I like this one. It's interesting and I hadn't really thought about something like this. $\endgroup$
    – ebhooks21
    Apr 22 at 20:06
  • 5
    $\begingroup$ I'm so happy I decided to get the Coca-Cola-Microsoft-Ford implant instead. Those come with a lifetime guarantee for not having a kill switch. 😜 $\endgroup$ Apr 23 at 4:55
  • 4
    $\begingroup$ @EscapedLunatic Have the lawyers noticed yet that the "lifetime" stops when the device malfunctions? $\endgroup$
    – Graham
    Apr 23 at 12:13
  • 1
    $\begingroup$ @EscapedLunatic The sad part is all the implants are identical and come from the same factory. It's like the Blender Wars. Just the price and packaging is differenct. $\endgroup$
    – Daron
    Apr 23 at 12:13
  • 3
    $\begingroup$ @EscapedLunatic I only trust the TeslaSpaceXKhanAcademy Wellness chip. $\endgroup$
    – Daron
    Apr 23 at 13:40
14
$\begingroup$

This kind of weapon exists and is called a nerve agent. A famous example is sarin, which was twice used in terrorist attacks in Japan. From the wiki:

Exposure is lethal even at very low concentrations, where death can occur within one to ten minutes after direct inhalation of a lethal dose, due to suffocation from respiratory paralysis, unless antidotes are quickly administered.

Sarin is generally considered a weapon of mass destruction. Production and stockpiling of sarin was outlawed as of April 1997 by the Chemical Weapons Convention of 1993, and it is classified as a Schedule 1 substance.

$\endgroup$
13
$\begingroup$

Nanobot swarm

Nanobots are highly advanced nanotechnology used in warfare. They are released in swarms (which covers the criteria to be noticeable). They can be controlled and they are able to target humans. They are small enough to enter the internal systems of humans. They can stop a vital function, or block some vital blood flow, or release some deadly substance that can kill humans quickly with no significant visible bodily harm.

enter image description here

$\endgroup$
11
$\begingroup$

Don't say.

The war people were working on something. They must have found something. Because everyone is dead. Like they just sat down and died. Even in the tanks and war machines; even in the hazmat suits and the bunkers. But the birds are not dead. Squirrels run in the trees. Leaves stretch to the sun. Just the people are dead.

And some unusual things. Some of the bodies lie in circles, or stars. Have these dead people been arranged in patterns after they died? Did they arrange themselves then die? There are some among the dead who do not look like soldiers and do not look like locals. Where did these people come from? Why are there so many children? The birds are singing and the trees rustle in the wind, and it sounds like someone is whispering. But no-one is whispering. Everyone is dead. What was that they said?

It is the difference between porno and romance. In a porno you are shown everything. In a romance you have to wonder, and guess. Make it scary. Make them wonder.

$\endgroup$
4
  • $\begingroup$ When I watch movies where they fail to show the creature, or the alien tech, I just suspect the movie makers lack imagination and want me to do the work for them. $\endgroup$ Apr 23 at 18:30
  • 2
    $\begingroup$ @user3653831 there is no disputing that a lot of people like porno. $\endgroup$
    – Willk
    Apr 23 at 18:39
  • 2
    $\begingroup$ @user3653831: Only if the "creature" or the "alien tech" is germane to the story. The question does not say anything about the relevance or lack of relevance of the weapons technology to the story. If the exact weapons technology is not relevant to the story then it is actually better if you don't explain it. (Because the general rule is that a story should avoid makeing promises on which it doesn't intend to deliver. If you make an elaborate explanation of the weapons technology and then fail to make use it, then most readers will feel cheated.) (There are of course notable exceptions.) $\endgroup$
    – AlexP
    Apr 24 at 17:38
  • $\begingroup$ @AlexP /notable exceptions/ when Chekov's gun is front and center the whole time, and never gets fired. Even in the epilogue when it gets wiped off, but not put away. $\endgroup$
    – Willk
    Apr 24 at 19:31
6
$\begingroup$

Halt all brain synapse for a bit (Brain EMP)

Imagine a sustained EMP, but rather than targeting wired electronics, it's geared specifically to overload the electrics within our brain. Hold the brain in stasis for say... 4 minutes, and everyone's stopped breathing for that amount of time, their hearts and other bio functions may have also been paused for that long. By the time the brain is free to move electricity around as it normally would again, it's dead.

$\endgroup$
5
  • 3
    $\begingroup$ What does "a sustained EMP [...] geared specifically to overload the electrics within our brain" even mean? $\endgroup$
    – AlexP
    Apr 22 at 18:36
  • $\begingroup$ This one is really interesting and 4 minutes isn't that long in the grand scheme of things. Almost like being able to stop ATP production. $\endgroup$
    – ebhooks21
    Apr 22 at 20:07
  • $\begingroup$ @AlexP What else could it mean? An EMP (or emp-like source/effect) that lasts for more than a single blast that could effect a target for an extended period of time (a few minutes in this case) created specifically to interact with the electrics within the brain (specific frequencies and power etc) in order to disrupt it's normal operation. $\endgroup$ Apr 25 at 17:05
  • $\begingroup$ Four minutes isn't long enough to cause brain death. Brain death is just setting in at that point. It needs to be more like 6-8 minutes, or 10 minutes to be certain. $\endgroup$ Apr 25 at 19:12
  • $\begingroup$ An appropriate amount of time can be established certainly. Duration isn't set in stone. $\endgroup$ Apr 26 at 15:19
5
$\begingroup$

Supervillain

First, the hapless population of the planet was passivated and caused to accept the idea of a supervillain surrounding them with broadcasting satellites. The satellites released a tunable monochromatic terahertz signal, which we'll henceforth call "5G".

When the 5G was set to the right frequency, it was able to resonate the structure of oxyhemoglobin in the blood. Loosely, hemoglobin in the human body works like a Daoist sexual practice, keeping Fe2+ (ferrous ion) always just on the verge of a conclusive reaction with O2, but never quite allowing it to be satisfied. By nudging it with an intense broadcast of just the right frequency of weak non-ionizing radiation, the supervillain found a way to bring it through to the state where the oxygen reacts, leaving an inactive methemoglobin behind. Now, the body will normally restore the original hemoglobin form over time, but people all over the world were abruptly and heavily radiated with this killer 5G, which nobody had ever really studied health effects for Hz by Hz in any rigorous way (except in classified sources).

For a few minutes, each person targeted had to make do without oxygen in their blood. After that, they continued to make do without oxygen. It did not take long for the 5G system to run through the whole planet, assisted by the users' own spy devices and finishing off with satellite reconaissance.

  • I should note I don't know any such frequency exists, and also the current satellites stop around 50 GHz because of water absorption in the atmosphere I think. This hardly seems enough to get in the way of a fair plan to destroy the world, let alone a sci-fi yarn.
$\endgroup$
1
  • 1
    $\begingroup$ Upvote for the most provocative description of hemoglobin function I have ever read. $\endgroup$
    – Willk
    Apr 23 at 15:32
4
$\begingroup$

The Ice-nine Approach

Vonnegut's Cat's Cradle uses as its primary macguffin Ice-nine, an allotrope of water that is solid at higher temperatures than more common ice and self-catalyzes crystallization of liquid water to its form. This is consistent with a lower-energy form of ice existing; and although thankfully no such form has yet been found, it is not excluded.

For your purposes, Ice-nine is has some flaws. First off, while one can imagine freezing a human at room temperature by this catalysis, that would be an (unusual) mark; and human-to-human contagion would require ice crystals of one to come in contact with fluids of the other, which isn't straightforward.

Instead, the same mechanism of proposing a lower-energy allotrope can be applied to the oxygen in the air itself. We don't know too much about red oxygen (O8) currently, but we're pretty confident that it's not stable at atmospheric temperatures and pressures, let alone energetically preferred to normal gaseous oxygen under those conditions. But what if...

O16 if a fifth stable allotrope of oxygen, after diatomic oxygen, ozone, oxozone, and red oxygen. It is a murky brown-to-red liquid at temperatures up to 50 deg C and pressures down to a quarter of an atmosphere. It is lower energy than diatomic oxygen under normal conditions, but does not commonly form in nature. In addition, it is only autocatalyzing on the bulk surface -- that is, a droplet of O16 will tend to arrange O2 molecules that hit its surface into new O16 molecules, eight at a time; but a handful of O16 molecules insufficient to form a drop with a well-defined surface will not cause more O16 to form. Finally, O16 is extremely sensitive to ultraviolet radiation, and decays to a mixture of O2 and O3 even in faint UV. (The ozone itself further decays to O2 with UV, but not as rapidly.)

The war between SideA and SideB reached the point where drastic measures were needed. SideA had synthesized O16 and confirmed its properties. Hundreds and thousands of liters were synthesized, and loaded into aircraft. At noon over the coastal airbases of SideA -- just as the sun finished setting over the other hemisphere, where SideB plotted their own plots -- a flight of three hundred bombers lifted off, with just enough fuel to cross the ocean. The bomb bays were empty. One fuel tank, in the fuselage, contained fuel. The other fuel tanks were filled with O16.

As the bombers crossed over into the dark hemisphere, the dump valves on the fuel tanks were opened. Falling through the atmosphere, the streams of red O16 broke up into an orange pink mist. The droplets, held together by surface tension against the wind of their own falling, did not dissipate further -- instead, they began to grow as O2 out of the rapidly thickening atmosphere adsorbed onto each drop, becoming O16 and adsorbing yet more O2.

Underneath the bombers, a flood of O16 poured onto the ground, a rainstorm of such intensity as has never been seen. And as each new droplet fell into the pooling murk below, more and more oxygen fell out of the air.

The airfall itself, although intense was, in the end, just a storm. Individual drops were small and hung in the air, causing an intense deluge over hours, rather than a literal river falling from the sky. And the watershed below was just as capable of channeling O16 as water -- with occasional dramatic landslides, dam breakages, etc.; but on the scale of a millennial hurricane, not an unimaginable disaster.

But after the fall... death. Rapid and inevitable not just for humans, but for all terrestrial animals. For the O2 level had reached so low that there was nothing to breath. Without a rise in CO2 levels the human body does not realize that it is low on oxygen -- instead, consciousness just fades, and death follows. In the lakes and the seas, the fish survive, as the dissolved oxygen cannot adsorb onto the O16 that is mixing in with the water rather than forming drops.

The sun rises the next morning over a flooded, brown, desolate landscape. With the first rays of the sun a mist is seen shimmering over all the lands. The O16 is breaking back down to O2, which is remixing with the air. Sporadic forest fires start as local oxygen concentrations spike; and with no one to put them out, some grow out of control. But in the cities, where there was nothing to burn; in the valleys, where the O16 flowed to the sea and will burn off from the surface over the next few days; and where the fires did not, by chance, start -- all that is left is the blue-lipped corpses of all that once was alive.

$\endgroup$
2
$\begingroup$

Vacuum bomb

Those near the ignition point are obliterated. Those at the fringe are likely to suffer many internal, thus invisible injuries, including burst eardrums and crushed inner ear organs, severe concussions, ruptured lungs and internal organs, and possibly blindness."

Just be aware this is a good way to get on human rights groups naughty list.

$\endgroup$
3
  • 8
    $\begingroup$ I think that killing millions of people, no matter how "humanely", is probably going to put you on all sorts of naughty lists. Note though that this is a blast weapon, and as such can't possibly leave the bodies largely undamaged as the OP requested. $\endgroup$ Apr 22 at 19:55
  • 3
    $\begingroup$ I like this one, but it is definitely more destructive than what I had in mind. $\endgroup$
    – ebhooks21
    Apr 22 at 20:13
  • $\begingroup$ @StarfishPrime not if they can't figure out who did it or how! $\endgroup$
    – user253751
    Apr 25 at 10:39
1
$\begingroup$

Anti-gravity satellites

Special device (or weapon) emitting a gravity beam to pick up people from the surface and put them in a low orbit trajectory, long enough to kill them. Most times they need to be put up say 10km in the air.. keep them up there for a few minutes, they will just suffocate and freeze a bit. In the air, you can do with them whatever you like. You can also put their corpses back on the surface again, gently. They will unfreeze and their bodies sustained little damage, except the brain damage that killed them.

$\endgroup$
4
  • $\begingroup$ So just surround the entire planet with enough satellites, activate them all at once, then hold everyone up until they're done. Though I'm not sure how to deal with the collateral mess of everything else that's picked up with anti-gravity. That's a completely different issue though, and not really tied to the question. $\endgroup$
    – ebhooks21
    Apr 22 at 20:11
  • $\begingroup$ @ebhooks21 these sats are quite advanced: every sat can handle groups of people gathered in one place.. and they work very effectively.. a sat can lift up hundreds of people each hour and land their corpses back on Earth. Every 15 minutes a cycle is finished. 1000 of these sats will do to kill 7 million people per day. $\endgroup$
    – Goodies
    Apr 22 at 21:00
  • $\begingroup$ And yes, there will be some collateral damage, like pets and cattle being lifted up along with humans. Parts of buildings will fly along, especially roofs. Lots of people will be e.g. pulled out from their apartment buildings, breaking through windows. Some will have minor injuries when they return, like bruises and scratches.. hope it's not a show stopper. $\endgroup$
    – Goodies
    Apr 22 at 21:10
  • 1
    $\begingroup$ Freezing someone solid will do a lot of cellular damage. $\endgroup$
    – jdunlop
    Apr 23 at 0:20
1
$\begingroup$

If the goal is just to leave intact corpses, then there are a lot of options – poison gas, plague, radiation – but they are all far from "clean". Any chemical or biological agent is virtually impossible to disperse over a significant area such that everyone gets a promptly lethal dose; realistically, if you sprayed an oil tanker's worth of VX on Chicago, some people would get a million doses and die in minutes, but some would be running around panicking hours later, and some would still be alive after a week. With any type of radiation, if the source was powerful enough to kill everyone in a 100m radius within 24 hours, then by definition it is at least powerful enough to set stuff on fire; whereas if you used lots of small sources, e.g. plutonium-238 dust, you have the dispersion problem again.

To make everyone in a city-sized area drop dead at once, short of brute mechanical force, there's no know way to do that (which is arguably a good thing). You could electrocute them all, but you'd need an environment specially set up for it.

In the realms of handwaving, you could have a memetic virus or poison-releasing implants distributed in advance and triggered by a radio signal / musical cue / etc. Or [some kind of quantum woo] could temporarily change the ionization enthalpy of sodium atoms, causing people's nervous systems to shut down but without visible chemical side-effects. Or a wizard could teleport everyone's hippocampus into the sun.

$\endgroup$
1
$\begingroup$

Perhaps a bit less hard scifi, but say they invented teleportation a la Star Trek, but due to power constraints full body teleportation is too costly (and certainly too costly to affect an entire warfront at once). However targeting a cross section of arteries leading to the brain, either surgically removing them or placing a block/blood clot/foreign object instantly shutting off blood flow leads to everyone targeted appearing to instantly die for no apparent reason with minimal energy costs.

$\endgroup$
0
$\begingroup$

I think a biological weapon in such a war would be a airborne transmissible Coma Inducing disease.

You can add a lot of Sci-fi to the idea and there are lots of paths to follow, connect with the "what consciousness is" question or just move onto the consequences of having a whole world of sleeping bodies that will slowly die of dehydration and hunger.

$\endgroup$
1
  • $\begingroup$ Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center. $\endgroup$
    – Community Bot
    Apr 23 at 14:35
0
$\begingroup$

Genetic magnetic weapon

The weapon would change the magnetic reliance of a cell, and the cell will disfunction for a very short time, which lead to death of body. Migratory birds rely on its magnetic sense (towards the Earth's magnetic field) to fly across the earth. If migratory birds' magnetic sense is disturbed somehow, when the migration season comes they will start to fly but to the wrong direction. And very likely die half way.

This damage can be exerted to the individual when it is against an individual. This damage can also be exerted to the mass when a weapon is used to manipulate the Earth's magnetic field.

Extremely Low Frequency Magnetic Fields

Most human invented devices do not significantly disrupt long term functionality of the genetic code as they are at or under 2 Tesla of strength. The generation of extremely low frequencies seems to be a factor in potential damage to the genetic structure.

Study of genetic damages from ELF magnetic devices.

This implies that a device that is disruptive to genetic structures or even brain waves would have to be both higher strength than any normal human devices, and would also have a short range and would have to be deployed strategically in geographical terms.

Magnetic Strength for Weaponization

The threshold seems to be at about 15 Tesla or better for significant genetic disruptions.

Plant Cell Disruption at High Magnetic Fields

Since higher strength affects the range, the strength of such a weapon would be a multiple of 15, such as 30 Tesla or higher. There is no guarantee that other lifeforms would not die, since there is no particular way of tuning this to only affect human bodies. The need to generate and use high amounts of power would be a limiting factor, so advanced power generation may be a factor in the use of such weapons.

$\endgroup$
2
  • 2
    $\begingroup$ As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. $\endgroup$
    – Community Bot
    Apr 23 at 10:17
  • 1
    $\begingroup$ That might work with birds, but the magnetic disturbance is not the immediate cause of their deaths. How do you envision humans dying like that? $\endgroup$
    – Joachim
    Apr 23 at 12:52
0
$\begingroup$

Microwave Egg Brain

enter image description here

If you heat a bowl of damp rice in the microwave the inside heats faster than the outside. You have take it out and stir and put it back in. This is more extreme for an egg. The wet inside of the egg heats faster than the dry outside because microwaves work my vibrating moisture to create friction.

Your head is like an egg. It has a dry skull on the outside and a wet brain on the inside.

Your death weapon works like a big microwave oven. It creates a bunch of microwave radiation. Not enough to melt the dry outsides of the victims, but enough to vibrate their squishy brains until they become jelly.

Of course the brain jelly is still contained in the skull. Unless you have the bright idea to crack open the skull then it will remain a mystery.

$\endgroup$
0
$\begingroup$

Way out of my league here .... An air burst bomb detonation or series of detonations causes infrasonic sound waves of a frequency and intensity that damages the liver. The liver damage {somehow} causes the upper esophageal sphincter to go into spasms preventing the victim from being able to breath. They asphyxiate.

$\endgroup$
0
$\begingroup$

A gaseous chemical inhaled by the participants did it

In the film Serenity (Firefly Universe), [spoiler tags used in case you've not seen it]:

the Union of Allied Planets added the Pax to the airprocessors of an entire planet, Miranda, to pacify the populace. However it worked a bit too well, and caused 99.9% of the populace to stop doing anything at all (including eating) and just waited for death to come. The remaining 0.1% of the population became ravenous killing maniacs committing all of the worst crimes humans can.

In your world, peace activists could use this same substance in an attempt to stop the war...but it had the unintended side effect of killing everyone!

As for being noticeable, if it is dispersed at a sufficient altitude, by an air-burst munition, in the right conditions, it would fall over all of the combatants not leaving any chance of escape.

$\endgroup$

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .