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Of all the explorers in the Blackstone Fortress, the towering robot known only as UR-025 is perhaps the most mysterious… and dangerous. An automatous tool of Magos-Ethericus Nanctos III of Ryza, the machine’s true reasons for joining the muster at Precipice and venturing inside the ancient alien labyrinth of the fortress is unknown. When it enters the twisted, ever-changing corridors of the alien construct alongside a force of other explorers from the Adeptus Mechanicus, secrets may come to light… and they are to be feared.