Editing Exterminatus (section)

==IRL Exterminatus==
''[https://en.wikipedia.org/wiki/Global_catastrophic_risk see Global Catastrophic Risk]''

===Thermo-Nuclear Holocaust===
{{Topquote|After us - silence.|Russian Strategic Rocket Forces Motto}}
Apparently, even when we aren't in the 41st millennium we still mastered the art of royally buttfucking a planet. In this case, it's ours, and a full-scale thermonuclear war between the United States and the Soviet Union, who each have a few thousands of nukes, would be enough to kill off humanity (1 billion in the exchange itself, everyone else within the next 2 years). This is how Mutually Assured Destruction works, threatening each other and our own planet with Exterminatus with zero chance of survival, just so we won't begin another World War. Because [[Imperium of Man|we're bastards like that]].

The Cobalt Bombs described by Dr. Strangelove above are actually possible, though currently theoretical. Nuclear weapons designed to be deployed as bombs or missiles aren't strong enough to destroy the world with only 50 warheads, but if you don't mind moving the weapon once it's built, the only limit on how big your nuke can get is how much material you're willing to use on it. In theory, the doomsday device of Dr. Strangelove could be achieved with a single massive bomb.

This is further worth mentioning because automated retaliation systems that could activate nuclear weapons in response to a detected threat ''actually existed''. The Soviet Union had the "Dead Hand" system, based off of seismic, air pressure, and EM sensors. The system was normally kept inactive and was only supposed to be turned on during a crisis to guarantee that the Soviets would still be able to use their weapons even if their leadership was taken out by a first strike.

Some believe that elements of the Dead Hand system may have been lost or buried, and are active to this day. [[grimdark|A ticking automated Exterminatus waiting for a signal from aging Cold War-era sensors.]]

An old quote from the film ''WarGames'' summarizes the game of Global Thermonuclear War/Exterminatus: ''The only winning move is not to play..."

Side note: simply saturating the surface of a planet with nukes is actually exponentially more energy-efficient than any method of destroying the actual planet itself, so if all you want gone is the people or creatures inhabiting it, then realistically this is what you'd go with.

===An Asteroid===
Really, all it takes to kill everything on a planet is a big enough rock traveling fast enough. Normally it's the cloud of dust that is kicked up into the atmosphere and blocks out the sun that does most of the work. Dinosaurs learned this the hard way. Of course, this doesn't really work too well on a forge or hive world which is already like that. For raw destructive force, however, the damage is a function of the speed and size of the asteroid. The former has some practical limits (though a civilization looking to weaponize this sort of Exterminatus could possibly bring the rock up to relativistic speeds), but the latter can be nearly unlimited.

A collision with a near planet-sized object would be more devastating than most ''fictional'' Exterminatus weapons, obliterating the target world entirely. There could be any number of so-called 'rogue' planets floating in the empty spaces between stars, ready to slide into the solar system and crash into Earth, assuming humanity fails its collective ''Save or Die'' roll for the week. They'd have to [[fail]] incredibly hard because the overwhelming chance is that the rogue body will end up into the Sun (or Jupiter as a distant second choice), but yeah. [[Just as planned|Shit happens, yo!]]

Also, to clarify something: once the asteroid rises above a certain size threshold --many times larger than the one that killed the dinosaurs, in fact-- then a collision with Earth would actually result in completely ''sterilizing'' the planet, as in everything down to the last microbe would die. So... sweet dreams. (though once they got that big we would almost certainly see it coming.)

===Super Volcano===
Works on the same principal as the asteroid, that if you get enough shit into the atmosphere you've royally fucked all life bigger than a mouse. This may not be very likely though on Earth as one of the biggest volcanoes (see Yellowstone Park) wouldn't wipe out humanity. Maybe.

Unless, of course, seismic activity from that eruption managed to trigger the [http://www.bbc.com/news/science-environment-25598050/ OTHER NINETEEN] super volcanoes.

===Artificial Plague===
The Black Plague killed up to 60% of Europe's population and the Spanish Flu over doubled the death toll of what was then most devastating war in history. With '''''SCIENCE!''''' you could do even better! You could even render your own people immune to the effects before hand and only kill the enemy. Sane people dismiss this as possible but a fantastically stupid idea because viruses are impossible to contain and like to mutate, rendering any vaccine you used worthless. Still, people interested in causing the end of the world have minimal overlap with sane people, so terrorists causing one is a popular plot. Another possibility is a virus in a research lab breaking containment rather than being released intentionally.

However before you start panicky a plague basically has no chance at killing humanity off. It can do a lot of damage yes, but once it kills enough people it will, like a fire, run out of fuel and burn it self out. This is why the common cold is so, well, common, It doesn't kill you so you can keep spreading it. Any sickness lethal enough to even have a shot at killing humanity off, will kill people so fast that it can't spread, even assuming humans can't treat it. Now if you think the COVID-19 pandemic showed that developing a vaccine isn't necessarily quick or easy, well your wrong. Less then a year for a vaccine is incredibly quick all things considered. In contrast the polio vaccine took over 4 years to produce. And after almost less then a year we are managing to produce over [[Noblebright|1 Million Doses Per of Vaccine per-day]]. That is a feat and a half even before you consider how we've managed to mitigate it via social behavior.

===Other Methods===
Some dude actually collected a list of ways that the Earth itself could be physically destroyed here: https://qntm.org/destroy But note that unlike with Exterminatus, the working goal there was to physically destroy ''the planet itself,'' not just the population.

It's a really clever and thorough list. One listed method, for example, is basically to just yeet rocks into space until you run out of rocks.