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The STCs are a very important thing for the [[tech-priests]] of [[Mars]], because they are a bunch of nutters who for the past ten thousand years have done next to nothing to promote technological progress because <s>they think their machines are alive and that modifying and developing them will hurt their precious feelings</s> any tech more complex than a flintlock can and will be taken over by a [[Void Dragon|zombie robot dragon]] living in Mars if used without protection. Finding an STC is thus the only possibility the Imperium has for restoring humanity to pre-technutter levels. If it manages that, it could surely wipe out all its enemies. Of course, the Mechanicus has a few good reasons for avoiding experimentation. There's more than a few planets that are now uninhabitable, or just plain gone after a magos decided to do some experimentation. See the contagion of [[Ganymede]]. Basically, Golden Age humanity was so damn advanced that dicking with its tech without understanding it is insanely dangerous. Imagine if we lost nearly all of our scientific and technological knowledge to the point your average Joe didn't know how to use a cell phone. Now, he finds a factory and tries to use it. You can imagine what would happen. Even worse, this would cripple the factory from being used by people who come along who actually ''do'' know how to use it. Cue AdMech paranoia about people fucking with new technology.
<s>But of course, this being W40k, where status quo is god, this will never happen.</s> GW has finally gotten around to moving the timeline along, and while there has yet to be recent STC recovery, possibility is out there now. Though, the Emperor probably knows full-well that the Ark Mechanicus ships are STCs because he's the motherfucking Emperor. Who is smart enough to understand telling the Mechanicus something the cogboys would hear as "right there is all the knowledge and power you need to conquer humanity and turn everyone into slaves or servitors, have fun". Even more so that a complete STC is meant to be used to build up to Golden Age standards from absolute scratch if necessary. Which means one of them would completely negate the power of the Mechanicus and its place in the Imperium. Unless it's controlled by the Mechanicus, in which case it would be abused to control the Imperium and force the Machine Cult on everyone. Which is funny because the Machine Cult strongly resembles Christianity: Omnissiach = Jesus (extra irony that Emps ''is'' Jesus), Machine God = God (and fits perfectly with God as the creator of the Cosmic Machine that is the universe). See Mechanism for real life Machine Cult like stuff.
On the bright side, there would also be plenty of cogboys who believe in upholding humanity over political power or conquest. Especially after ten thousand years of "humanity first and always" indoctrination added to normal Machine Cult lore, which they didn't have until the Emperor came along. On top of ''that'' the Emperor is the Omnissiah (though, probably not all Tech-Priest believe this). So, we'd have a techno civil war (probably destroying the STCs anyway) and the Imperium would be greatly reduced in size (still several times larger than everyone but the Orks combined) and advanced enough to make the height of the Great Crusade look primitive but still nothing compared to the Golden Age and no more STCs. Yay. At least then the AdMech might know enough and have enough tools to get back to performing science and experimenting in safe ways with enough data to get a sort of general idea for the direction of STC technology. They'd puzzle the truth of things out eventually so the humanity and the Imperium would be better off anyway. Especially now with the Eldar alliance as maybe they'd see keeping at least one STC intact and in the hands of Guilliman as a good thing worth fighting for in order to ensure the destruction of everyone but the Imperium. Hey, they know they can at least trust Guilliman to keep his word and prevent their extermination but everyone else would gladly kill them.