Sadde's running.
Not for any particular reason, just because it's faster. He's been meaning to go to one of the capitals for a bit and now, he supposes, is as good a time as any.
And eventually he's not running anymore, because he's close enough to civilisation that someone might spot him. Not that he wouldn't be able to notice them by scent before they saw him, but still. And as he makes his way to the Norway capital at this more leisurely pace, he notices the tiny, shiny key. He walks towards it and picks it up and immediately notices just how magic it is. He can tell by the way the key feels like things, and different things depending on where it is.
He verifies that what the key feels like is consistent in absolute location by waving it around a bit and seeing that the same place always feels the same. "Huh," he murmurs to himself.
He straightens up and thinks. The first obvious thing to try is seeing whether it opens any doors—a universal skeleton key sounds like the kind of thing a magical key could be—but the second obvious thing can be tested right there and then. He pushes the key into thin air with some purpose, as if he wanted to unlock an invisible door, and then turns it, et voilà, the faintest of door-shaped outlines appears before him.
He locks the door, and it disappears. Unlocks it again, and there it is. So he pulls it open and sees—
Hug. "It's okay, I got in touch with them after they died. I export a bunch of stuff to Limbo through them when there are concordances."
Hug! Sadde likes hugging Cam, has he noticed this? "Is there a reason other daeva didn't tell you or anyone else about the afterlives?"
"They told me about Limbo. I tried to summon Limboites. Doesn't seem to be doable, at least not with anything based on the same principle. It is entirely possible that they just didn't know about the ex-summoners, there's billions of daeva and had never been many summoners before I came along and blew the secret wide open."
"No. I didn't have anything productive to suggest be done about it - couldn't summon anyone to give them stuff, the daeva realms already give them stuff - and I didn't want to distract from the revolution in every form of material scarcity that I was trying to kick off. And it hasn't come up in the time since because I don't even know why - the demons can't talk, the fairies and angels usually can - but I've seen no sign of humans knowing about it. If I'd lived longer I might have orchestrated a reveal about that too, because it's possible to correspond with Limbo via daeva, but it's so laborious and time consuming that it didn't seem urgent - there wasn't a Limbo concordance of any kind during the time between Revelation and my death."
"Alright, so, experimental results. I couldn't find anything in common between locations that feel the same, nor anything consistently different between locations that feel different. Every door seemed to open to a different place."
"Mmhm. No banana. Interestingly enough, the one time a door opened into the vacuum of space I wasn't suddenly sucked into it."
"Apparently the door just didn't let air through, so no sucking occurred. I didn't try sticking the radio there though, since no other doors I opened went to space. Which is actually also pretty interesting, there's much more space than not-space, finding not-space should be basically impossible."
"Not from my vantage point but I hadn't reached the level of frustration necessary to actually go through a door yet."
"I'm curious how the pressure differential works. Tempted to try threading things through on a tether."
"You'll be hard-pressed to come up with a non-contrived situation that would cause me to say 'no' to experimentation. Wanna go test it?"
And Cam makes a cute li'l space probe and puts it on a nanotube and lobs it into space.
The space probe will see: space. Nothing particularly interesting about it, other than it being space—no nearby planets or stars or even debris.
"This looks like incredibly boring space! So the bias may be, say, planet-biased but only statistically, as opposed to strongly filtering for there being stuff. If it were about matter we'd be seeing more stars and gas giants..."
"Yeah. I also didn't find any other places with people, and there are enough different places in a single room where I could fit the key that even with superspeed I would probably take weeks or months to try them all."
"Yeah, it made me wonder if the universe of origin, or the place in the universe of origin, could have something to do with it. I wasn't exactly in a public place back in my world, I was in fact in the middle of some woods, but I was closer to, uh, civilisation, so to speak, than we currently are."
"It's not a bad commute to the plane of gold, but we could go try this in a city if I could think of a suitably private place in a city."
"Yeah! But we should probably get other tests that don't need that out of the way, first."