@Elias, We're making this happen.

@Anyone else, This is a work-in-progress (or, by the time you read this, maybe abandoned?) fanfic by Andrew and Elias: what if Origin Story took place within Brandon Sanderson's Cosmere?

Although I'm calling these “Chapter n”, that doesn't mean I actually intend for them to be as long as normal book chapters.

After experimenting with storing herself with Con & Eden, Mary-Mary only manages to escape from the Spiritual by traveling through Invention's Perpendicularity into the Cognitive, wanders around a bit, then back to the pseudo-Physical. Con, being traumatised by her disappearance, ends up hiding even more. Mary-Mary explores the Cognitive more and eventually finds the top-secret prison where Davy is, and steals him.

Mary-Mary and Davy find the edge of Citropolis's Cognitive and break out of it, then wander away from it towards Roshar (I think I'd prefer to skip Silverlight because I don't want to have to make up what that's like, although that does leave us with a language barrier. Maybe they just learn Veden or Alethi the normal way, or we could find a different excuse. Also, skipping Silverlight leaves them to be more surprised at Roshar.)

They arrive in Shadesmar and meet some spren. Davy finds out that Con's there. The Cryptics are fascinated by Con, who's terrified. They learn some stuff about Roshar. The spren learn some stuff about Citropolis. At least some of them say the first ideal. Mary-Mary tries out some interactions of her Spark with Rosharan stuff.

They travel to the Kholinar Oathgate to try to escape Shadesmar, then discover they can't use it and work out a way to get out with a combination of Mary-Mary's Spark and her connection to her spren instead. They get used to Roshar's Physical Realm for a bit. I think some more stuff should happen here given that it's such a new experience for them. They are running out of Citropolitan food, complain about having to eat instant noodles, meet Hoid, and learn about the king's feast from him.

They gatecrash the feast where Galivar is assassinated because they don't like Rosharan (or I guess specifically Alethi or Vorin) food and they think the fancy food at the feast might be better. I think Mary-Mary, being a bit of a foodie, would be more interested in and accepting of unfamiliar cuisine than Davy and Con.

They con Brightlord Davar into buying a fake Shardblade that's actually just a wand.

Shenanigans while they avoid getting caught by the Skybreakers.

I think Elias said more stuff about wanting them to interact with the events of the Stormlight Archive but I don't remember the details.

They should also be making progress with their Ideals during all of this, not outstripping the canon Stormlight Archive characters but not falling too far behind either. As Con makes progress, he spends less and less time stored and more time actually dealing with issues in the real world.

Hoid visiting Citropolis during the events of Origin Story, giving one of the other characters cryptic advice or something.

Mary-Mary's Spark transports things to the Spiritual Realm while making a Connection between them and herself so that she's able to retreive them. Davy's ability to transform things into air doesn't edit what the soul of the thing thinks it is like Soulcasting but just adds another layer on top. Sparks generally don't work on aluminium but there is no aluminium in Citropolis.

Citropolis is an enclave of Physical within the Cognitive Realm, created (or at least transported there) by Whimsy and Invention. The area of the Cognitive that corresponds to Citropolis is some distance away inside a giant aluminium dome. It is the forest from Titania's dreams. The souls of objects appear in the forest as other objects, unrelated to their physical forms. Most of them are plants and stuff, as it's a forest, but there are also other strange things that don't fit, as it is Whimsy's domain. I'm imagining things like toys and delicate garden furniture. Whimsy's Perpendicularity is hidden in the botanic gardens, and Invention's is deep in the abandoned train station. The area that the Old Guard used was land, so it corresponds to Citropolis's sea. I sort of want the areas around the perpendicularities to be accessible without a boat and the souls of all Citropolis's objects to not just be underwater but without it being a bead ocean like Shadesmar, so maybe it's a mangrove swamp or something? That feels a bit like a tacky solution to not much of a problem though. I guess I also don't want the area corresponding to the city to just be featureless. I think a steampunky aesthetic would fit well with Whimsy and Invention, with the more Whimsy-aligned things tending more natural and decorative, and the more Invention-aligned tending more mechanical.

Fitting in with the theme of things in the Cognitive being inverted, if Davy's prison is deep underground, I'd like it to appear as high in the sky in the Cognitive. That way it obviously stands out and it's likely Mary-Mary will visit it. The old subway (which is already connected to a Perpendicularity), mines, bunkers and underground nuclear waste storage facilities (if they exist) would also be highly visible landmarks. Correspondingly, Citropolis's skyscrapers would correspond to deep underwater, perhaps with the souls of their contents intertwined with the roots of the mangroves.