New Vyre Office of Foreign Affairs

when you look at a setting like Fallen London, you have a lot of space for weird stuff but you don't have infinite space, or infinite time. eventually, if you want to throw in new weird stuff, you have to explain where it came from and why nobody happened to stumble across it before (unless you're an olympic gold medalist in foreshadowing and your writer's bible has more prophecies than the real one). you can manage it a few times, but eventually the world starts getting cluttered

this isn't a problem unique to fallen london, far from it- warcraft has been getting away with it for decades, though it's gotten to the point where a whole new undiscovered island with a whole new undiscovered threat has started to wear thin even for its target audience

House of Many Doors has a solution to this problem, one that isn't unique to it but which it leverages to great effect: stuff just shows up sometimes. the house steals things from other realities

people, monsters, whole cities, whole armies, gods, all these things can kinda just appear anywhere at any time

this has implications- the House's local reality (without getting too heavily into spoilers) is porous and subjective, with artifacts and individuals from other realities come some of the rules of that place. things don't just lose their potency entirely, and often enough can keep a good portion of it

it's not a perfect solution and, like the other, it's a trick you can only play so many times in so many ways