- "Electro-priest Lagius..." - the magos raised his hand, allowing his robe to unfold slightly and exposing his fully bionic arm, and pointed towards his companion - "...will answer your questions as he leads you to your appointed quarters. Now, excuse me, Sophia servants, for I have important matters to oversee elsewhere." The tech-priest turned and quickly walked away.
Then, Lagius, who had been silent so far, spoke. His voice was nearly human, only a bit mechanical. - "Follow me guests. I shall answer your questions shortly."
The Electro-priest's 'shortly' apparently meant 'after we walk through half of the local forges and reach the habitat'. You couldn't find yourselves to be angry - the noise rendered all attempts at communication impossible, and all you could do is merely sightseeing.
Indeed, the forge-world was... majestic. Not beautiful, as Carnelia spires, but majestic. Heavy fumes covered it to the very surface, but through them you saw things you did not even think could exist: marvels of technology, forges as big as space-ships, and space-ships in construction, many times bigger. Only the Eldar seamt disgusted by the planet.
Finally, you reached your quarters - a small, pre-fabricated habitat on the edge of the forges' district. Here, you would be able to talk with relative ease. Lagius begun to answer your questions. - "Who were the ones who vanished? Cogs in the greatest mechanism of the Imperium, mere workers, who are born to serve, and through servitude earn their salvation. They worked in scriptoriums, overseeing auto-quills and replenishing ink. I do not possess accurate information about their disapearance and, by Omnissiah, I don't think that they are important in any way."
He paused for a second, perhaps wondering what to say next. - "Maybe you will find something about them in the cantinas. I can only provide you with information on Magos Errant Diego Allumis, flesh-son of Magos Diego Allumis, who you just happened to meet. He was working on an efficient way to deal with the foul Eldar, the deceiving, by means of toxins and fumes, helping us clear several of their so called 'exodite worlds'. He disappeared yesterday from his work-post in the Grand Library. Nothing else is known, but his quarters seem abandoned, and he has sent one of his test subjects back to it's place of origin a week ago. That's all I know."
Lagius passed you small seals. - "These will open your quarters. Inside you will find basic supplies and two specially crafted servo-skulls which can act as your guides. Mind them, for such things are difficult to craft. Farewell for now." - He vanished quickly and silently.
Your quarters turned out to be 'nearly' cosy. Lamp-packs, new sheeting on four bunks, lockers, a table and, for some unknown reason, a man-sized cage in a corner.