Numenera - Shards of the Looking Glass

An isolated aldeia is suffering a strange plague: duplicates of its citizens have started wandering into town. They seem to be identical to their originals in personality, memories, and ideals, but their presence is unnerving and confusing at the very least. Duplicates of the living were troubling enough, but now the dead have appeared—and their motives seem much more sinister. Can the PCs discover the cause—and face their own duplicates?

Numenera is set a billion years in the future, where eight world-shattering civilizations have risen and fallen. Now in what we call the ninth world, people are scraping a living by delving through the debris of the previous worlds, repurposing strange and unreliable technologies to achieve impossible feats.