After disarming you, his men roughly escort you through the halls of the repurposed factory to the room where Simos is. What does he look like?
“The room is empty except for a slab of black marble. When I approach, my own reflection smiles and says he’s been waiting weeks to meet me.”
… Damn. I have so many ideas, but I’d love to hear where you would take this.
Simos is you from the future. There was an… incident.
“My god, its full of stars”
As you approach the giant reflective slab of marble, you feel a force pulling you closer to it and you fall unconscious.
When you wake, the world looks backwards (right and left are reversed). And the once black slab of marble is now a white granite and your reflection has disappeared.
You turn around and see a door way unattached to a building. Perhaps this is the house of Simos?
Or, playing off the 2001 Space odysee
The marble shines as bright as the stars and you are whisked away to the divine.
I actually went with a mirror image that would follow almost all of their movements but every so often would do something different. When arguing at one point, he pounded on the reverse side of the slab, which shook the room. He kept trying to ask them to touch the slab.
Ahhh yes, the trapped soul looking for a suitable replacement.
Wrote a custom move for a demon that manifested from the bottom of wishing wells. It knew the wishes of everyone who had ever wished upon a coin and tossed it in a well. One of its moves was to produce a coin YOU had tossed into a well, any well, with a wish, and return that coin to you. (this could be throwing it aggressively; or perhaps it could masquerade as a clerk, and return your coin in change…).
When the Wish Demon returns a coin upon which you long ago made a wish, tell the GM what you wished for and roll +WIS. On a hit, the wish is not used against you. On a 7-9, the demon grants you a twisted or complicated vision of your wish. On a miss, the demon actually grants the wish….
So the reason i bring this up… i like the idea that a demon forms based on the reflections we cast. It has seen everything we’ve done in front of a mirror. Acts good and bad, venal and charitable, depraved and innocent. When you meet this demon in the black marble, it compels you to touch the marble, and it KNOWS things about you, but only things it has seen through other mirrors, elsewhere. It uses these things to make seductive promises to try to lure you closer.
Ask the player: what is the most thing you’ve done in front of a mirror? Then use that against them.
If they touch the marble, the demon gets out? Or they switch places? Or they get possessed? I’d like to think there’s a custom move, and on a miss, nothing happens. Their reflect continues to look back at them, only the little twinkle in its eye is gone. It is now a pure mirror image.
But tomorrow, when they awaken, they feel compelled toward vanity, depravity, etc… the demon is within them, and driving them to do things that they’ve already shown an inclination to do!
It’s not necessarily a punishment. To some PCs it could be a boon, at least for awhile. Maybe enough for a compendium class. But boon or bane, it should push some new weirdness into the world.