Ordo Reductor

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The Ordo Reductor is a small branch of the Adeptus Mechanicus that specializes in killing things. Now, I know that sounds like what EVERY branch does, but this is the one they call upon when what needs killing is harder to kill than normal.

The members of the Ordo Reductor worship the Omnissiah in his form of the Un-Maker, the Destroyer, the Bringer of Oblivion. Instead of providing knowledge, the Omnissiah brings death and destruction, and so do they.

And, unlike many ordos within the Imperium, these guys don't just throw bodies at a problem (read: serious threat to the Imperium) until it dies. Oh no, they study the shit out of it first. They're the ones who analyze every new alien the Imperium encounters, searching for the best, most effective way to kill it. They look over enemy tanks to see how to best blast it to smithereens. And when they see a fortress, you better believe they're looking for any possible way to turn it into a pile of smoldering rubble. And once they've figured out how best to destroy your shit, tear down your homes and kill your entire species?

They fucking do it.

To that end, the Ordo Reductor unleashes a number of weapons that are forbidden to others. The Thallax is somewhat iconic of the Ordo Reductor, as it is exclusively produced by them for the purposes of calmly, coldly and efficiently killing everything (sounds familiar...). These guys are what serve the Ordo instead of Skitarii, because Skitarii are too fleshy and weak to handle the kinds of weapons the Ordo Reductor uses regularly. Yes, you heard that right. SKITARII are FLESHY compared to the Thallax, and they need to be to survive the blasted wasteland that the Ordo Reductor leaves behind. Let that sink in.

When the Rangan Xenocides took place and were wiping the floor with the Dark Angels and Space Wolves, it was these guys, entrusted with something (and nobody knows what exactly it was) that the Emperor of Mankind himself retrieved from the Labyrinth of Night to be used against the hated xenos. Weapons that left Solar Systems devoid of life are the kind of thing they get to handle.

One of the things that make them unique among their Mechanicus bretheren is that they are ALLOWED to innovate. That most heretical act to the rest of the Mechanicus is actually part of their mandate. After all, you can't well be expected to wreck the shit out of a new alien race with just what is laying around, now can you? Not after studying them to learn their weaknesses, you can't. So they build, and invent, new weapons and vehicles as needed to exploit the weaknesses of the specific enemy they are facing in any given campaign. Got an alien race that is heavy on high-energy weapons but terrible in close combat? The Land Raider Achilles will get you close enough to rip them to shreds, and lay down serious firepower on the way.

The Ordo Reductor was officially created at the dawn of the Imperium, as part of the treaty that unified Holy Terra and Mars. Their explicit purpose was to destroy anyone or anything that might stand against the Great Crusade, i.e. anything that would actually put up enough of a fight that the Astartes Legions might have serious trouble with.

The Ordo Reductor would travel from warzone to warzone as the need for their special, murderous skills demanded. They traveled on ships that were effectively their own forges, and the Magos in charge treated the ship as such. The ships were specially outfitted to the needs/wants of the Magos and would have whatever facilities that Magos might need to best kill things, be it massive ammunition factories, tanks for growing special viruses or special machinery for building Ordinatus weapons. Whatever they needed for the task at hand, they'd have.

During the Horus Heresy, the Ordo had been divided among the various legions, serving in their killing capacity as always. When it came to light that Horus betrayed the Emperor, they sided with the Emperor. I know, murder-happy adepts who handle super rare, deadly tech AND are allowed to innovate and invent stuff siding with the Emperor sounds crazy, but they did. WHY they did is up for debate, however. The most reasonable reason is that they had been allowed such autonomy under the Emperor as well as being given special, forbidden weapons by Him, so Horus couldn't really offer them anything they didn't already have. Of course, there is also the distinct possibility that the reason the Ordo fought for the Emperor was simply because they wanted to test out different ways to kill Astartes, and the Sons of Horus were supposed to be the best of the Astartes Legions, led by the best of the Primarchs... and it wouldn't do to test their theories against lesser Astartes under lesser Primarchs, now would it? Regardless of their reasoning, they fought for the Emperor when much of the Mechanicus sided with Horus, even fighting on Istivaan III and the Drop Site Massacre among the Loyalists.

They never existed in large numbers (the kinds of adepts who were attracted to this line of work were similar to the types drawn to the Inquisition: a problem to everyone around them when they're not directed towards something that needs killing) and are generally known for their actions during the Great Crusade, so there was some question as to whether or not they were still around in the 41st millennium. But apparently a demi-legion of theirs did oppose the Armless Failure on Cadia, so it seems there are still some of these murderous adepts floating around the Imperium, looking for things to destroy.