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—
"Well, there's some nuance to the thing I called 'pessimism' or 'creativity about horror.' I try to think about the ways things could go wrong and to come up with ways the universe will screw me over, and that's at least in large part meant to balance out my innate recklessness."
"That it's easier to believe I'm creative to counterbalance recklessness than that I'm just creative!" He hugs his(?) demon.
Snuggle. "Well, then, if that is terrible, I will have to be terrible."
"Okay, so they vary, or it depends if anybody's gone through them, or something. I can chuck a basement dweller in?"
So Cam makes a basement dweller of a generic person and flings it through.
"Hmmm. I have never before considered testing protocol for a recalcitrant magical artifact."
"Me neither. Also it's been two weeks, I wonder if those two other spots will still open to the same place if we recreate their portals? I expect so, but, recalcitrant magical artefact."
"And even if you had I remember where they were," he says as he makes his way there and reopens them. Still the same places.
"Hmmm. I wonder if there's an easy way to determine whether those two are the same universe."
"...There's an easy way to determine if they're the same planet and on that planet radio functions normally."
"Oh, yeah, good idea. I can dig a hole to the surface from this one," he says, opening the door that goes underground and shoring up his muscles again. "Keep the key, if the portal decides to wink out of existence after me you can open it again."
"Um, are you sure you want to risk that? I could make a digging robot too."
"Right, boyfriend who can make arbitrary things, yes that's a good idea."