I've been trying to figure out a way to integrate The Machine into the world of These Stones Remember, but I was struggling with a few things:
Why would the people of the Ancient Capital build such a terrible, corrupting thing beneath their city?
If they didn't build it, then who did? An earlier civilisation? If that's the case, why - when I'm taking Pix's S2 finale as canon - would the migrating survivors of S1 (and/or their descendants, depending how long the journey took) have happened to build the Ancient Capital right on top of it? Sheer chance? or did something draw them to build there?
What was its original purpose? Someone built it, but did its construction originate with an evil, corrupting purpose, or did it have a more altruistic justification? Perhaps sculk was like one of those poisons that actually have rare medicinal uses when taken or used in small doses?
It turns out that my struggles were caused by straying from my primary source material: Pix's description of The Machine:
Deep in the darkness at the heart of the world, in a cavern buried under layers of rock, there dwells The Machine. Already ancient when it was first discovered, no-one could find any record of who built it, or how, or why. It simply existed, heretical and profane. A dark stain upon nature; surely the act of a people who had abandoned all their humanity.
Most who went near The Machine were driven away by the rattle of its mechanical innards, the screeching noises coming from deep within, the rushing sound of water, and a dark sense of unfathomable dread.
One fact remained: those who dared to approach The Machine, those could endure the unearthly noises it produced, those who would risk touching the ooze it emitted - moulding it, crushing it with their tools, or their boots, or between their hands - they emerged stronger than before.
– The Machine (Pixlriffs Empires S2 - Ep.2)
I'd been taking secondary sources as canon instead: the corruption of both Shubble and Cubfan. Those were both negative 'possessions' that caused 'wrongdoing'. But, note how Pix could cover himself in the stuff to try and convince Cub that he was on his side so he could cure him, and it had no negative effect on him, other than making him feel icky and making a point of diving into water to wash it off afterwards. So it didn't possess and corrupt everyone; only a few (and now I want to figure out what made Shubble and Cub susceptible to it).
But my primary source told a different story, one that didn't involve corruption: that those who could endure the noise and the terror, who dared to touch the sculk, emerged stronger than before.
In my worldbuilding, The Machine needs to be a test of willpower, a test of mental fortitude. And its reward should be physical (and possibly mental) strength, or something like that.
And, right there, Pix states that The Machine was already ancient when it was first discovered. So the people of the Ancient Capital will have discovered it. Heretical and profane would maybe have been their first opinions of it, until some brave (or foolhardy) soul dared to approach it and found out what it could do for them.
That's going to be some great meat for the bones of the chapter I plan to write about The Machine...