"The past holds many answers to conquering the future.”

–Magos Kiralon Burla, Administrator of P3482XW a.k.a. "Dark Echo

The world known to the Adeptus Mechanicus as P3482XW is a recently revealed, volcanic planet in the Thule Sub-Sector. Cut off from discovery by localised the Warp storms for some time, the planet’s sudden reintroduction to the sector just under a century ago has caused a stir amongst Rogue Traders, Explorator Fleets, and others who seek out riches amongst Askellon’s uncharted reaches. This world is not sought after for any known life or resources, but for the lack of such things. P3482XW, commonly known as Dark Echo, is a barren world—home only to sprawling ruins of a long-lost, unknown, and utterly alien civilisation.

The planet has only the barest traces of an atmosphere, barely breathable for humans. Tectonic shifts produce daily quakes ranging in scale from slight tremors to long upheavals that topple features across an area. Magma flows and other volcanic activity are also present, as the world undergoes changes reminiscent of a planet in the final throes of life. The Adeptus Mechanicus was the first to lay claim to the planet, establishing a research station on the southern continent to investigate the remnants of this lost species. This region is doubly practical, as it is both relatively stable and home to high concentrations of the alien ruins. While Askellon’s rulers recognise the claim of the Adeptus Mechanicus, they are not willing to let a find of such a potentially valuable nature go completely unchecked.

To “assist” the Tech-Priests there, agencies on Juno have dispatched a contingent of Astra Militarum and other support personnel to the world to aid in any capacity as required. In reality, they are there to monitor what the Cult of the Machine finds and report back on any discoveries.

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Echoes of the Past

The complex the Adeptus Mechanicus installed is a pre-fab base of a type dropped onto countless worlds across the sector. It covers nearly a square kilometre with all its various buildings and warehouses, and was set over the site of a large section of ruins that extend many dozens of kilometres underground. Conversations and other sounds echo throughout the caverns below, lending an unnatural and disturbing feel to the area that lead the Guardsmen assigned there to begin adopting its more common name. The Tech-Priests, adepts, and their numerous servitors are unfazed by this, and only the others stationed here are bothered by it.

The base comprises three primary areas: the research labs, the habitat section, and the equipment storage facilities. The labs are the largest of the three sections and are heavily guarded by sentry guns crewed with integrated combat servitors; the Tech-Priests are well aware of the spies in their midst, and go to great lengths to conceal what they have found until they can determine its value.

While most of the research areas consist of standard rote data collection stations, repair altars, and Omnissian shrines, there are several facilities devoted to esoteric branches of study. Here, Tech-Priests immerse themselves in specialised quests some would deem skirting the bounds of tech-heresy, or delve into areas forbidden on more established forges.

The final section is for equipment storage and consists of five warehouses. Large machines for excavation, ground scanning, and other processes are housed here in four of the sheds. The fifth (and largest) warehouse is off limits to all non-Machine Cult personnel and is heavily shielded with genetic-signature locks. What is inside is a mystery despite attempts at infiltration. Disquieting rumours, though, hint of a maniple of fearsome battle automata—worrisome if true, as none can imagine what the Adeptus Mechanicus has found here that would require such militant firepower.