In the time of the Great Collapse, a cabal of like-minded individuals set themselves up in a orbital sanctum and set about to explore extremes of sensation. They replaced their faces with featureless metallic masks that were actually incredibly sensitive sensory and recording apparatus. Their lower limbs they likewise replaced with mechanical ones covered with sensory fibers in a variety of modalities.
The Faceless Ones strove to experience and archive everything they could about their depraved experiments on those they fell into their hands. Ultimately, they created the Algosians as their servitors and collaborators.