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GuyInTheSky

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A Von Neumann machine is a machine that can reproduce itself. It has been proposed that these machines could be used to explore the galaxy and even the universe. At each planet they come to they would produce more copies of themselves, and launch them into space to explore and produce more copies of themselves. Their numbers would grow exponentially.

What if such probes mutated somehow? They stopped exploring and started devouring everything. A handful of these machines would travel across the vastness of intergalactic space. They would be strong, each one with five modules, larger than even battleships. The fleet wouldn't seek out military targets or care about borders. They would simply land on a world- whether that was a home world, an asteroid, a tomb world, or magma world- and begin producing more of themselves at the cost of every life, building, and feature on that world. The rate they produce more ships is based on the mineral value of the planet, but is much faster than empires or even sentient machines can produce. They have no need of spaceports or installations- all they do is produce more of themselves. They send out single ships until they meet resistance, and they start grouping their ships up into wolf packs of exponentially growing size. Even if you manage to defeat them it isn't over. Larger groups will come. The universe is infested with them. You will have to build massive intergalactic warp injunction devices to prevent them from crossing the vast blackness at faster than light speeds...but make no mistake- they will still come.

The strength of these monsters is obvious- the individual power of their ships and their numbers. I think an interesting mechanic could be that in each game they are spawned with random high end equipment on their ships. The machines then make perfect copies of this one ships design every time. A clever player could take advantage of this inflexibility to customize their ships to counter their ships. Another strategy could be to research debris from the Von Neumann machines and out tech them. A special tech could be to disrupt their friend or foe system so they attack each other. A devious player or AI might even create their own Von Neumann ships to use against their enemies.
 
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aitaituo

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Von Neuman Probe has become synonymous with universal scale extinction event for a reason.
 
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xcex

01_EMBASSY_PROPOSE
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This would be a pretty coo, idea for a late-game crisis. But I think that this shouldn't pe too op of a crisis. Maybe it would be better to have them either reproduce slowly, but each ship is strong, or let them reproduce fast and each ship is not that strong.
 

Fonz

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Would be nice to have the "Gray goo" version too, where instead they have hundreds and thousands of corvette/strike craft sized ships.
 
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Lord Tareq

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The highly underrated Sword of the Stars (the original, not the disastrous second) had them, and they were an incredibly annoying early game threat. Somehow I had the worst of luck with them in all my campaigns, and they would almost always find my homeworld within the first 15 minutes of my campaign at which point they were very hard to stop.
 
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Bolshevik_1924

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Hey thats an interesting idea, i like the sound of it.

Would not mind if something like this ended up in the game.
 
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Fuu

Chair-Speaker of the Integrated Councils of Ksako
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Yeah I saw this listed in the thread about inventing a late game crisis. A similar idea would be the hegemonizing swarms (heg swarms) from Iain M Banks novels; although in principle threatening, they seem to deal with outbreaks more like a housekeeping duty.
 
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Oscot

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Your empire IS a Von Neumann invasion.
Who do you think flies your colony ships? You don't get Spacing Guild Navigators 'til midgame.
 
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aitaituo

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Your empire IS a Von Neumann invasion.
Who do you think flies your colony ships? You don't get Spacing Guild Navigators 'til midgame.

I, too, enjoy analyzing behavior in terms of an unending conflict to destroy all other self-replicating patterns.
 

Cipher3

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I know Alastair Reynolds wrote about such an event with the 'greenflies' in Galactic North.