"Natively an infinite plane like Fairyland, but without any of Fairyland's stuff. The only stuff it has are the people in it, and one thing per person - 'thing' can be anything from their favorite dead dog to their house to a popcorn machine, the going theory is it's whatever tops the list of non-person things that they think an afterlife would be incomplete without. The things go on working even if they shouldn't - you don't need dog food or to pay your water bill or to refill the popcorn machine - but that's all they get."

Wince. "Oh, wow. Yeah, that's disappointing. At - concordances, can demons and angels make them things to help? Or is it all mail?"

"It's all mail, the concordances are mobbed with mail, I send my mom and dad big packages every time there's a concordance - Limbo or Fairyland, even though the fairies lose or steal the packages half the time."

"... Ugh. That's terrible," sighs Adana.

"Okay... what's a concordance?" says Tony.

"Little pocket of overlap between any two of Hell, Heaven, Limbo, and Fairyland. People from either side can go in, or leave into their own side, but you still can't properly visit. Heaven/Hell concordances are small wars by really obnoxiously patriotic demons and angels, but the others are impromptu post offices, which is probably the best thing - there's enough people who want to send mail that there would be way less space in there if the concordance was full of people trying to talk to each other in person instead."

"That seems to kind of suck," says Tony.

"It kind of does. I mean, it's better than nothing, it lets objects be transferred. My parents lucked out with their 'one thing' when they died, they mostly ask me for things for their friends."

Nod. "I hope you're right about summoners not going to Limbo. Because I don't want my dad and Zane to go through - that."

"My parents have never met anybody who so much as invited a fairy over for free cookies."

"Huh. I wonder... I mean, I don't personally know how to do it, but I know there's such a thing as magic that lets you move between dimensions. A bunch of different kinds. Most magic things around here come in a bunch of different kinds."

"I couldn't begin to tell you how to expect the systems to overlap, except that apparently at least as of recently you can summon and unsummon from here. Oh, and when I was gone my clock didn't think I'd been away for too much or too little time, so the worlds are also proceeding in sync, as far as that goes."

"Well, that's convenient. Okay, we can work with that, then."

"Convenient for calculcating dates," says Tony. "Actually, are our year lengths even the same? I mean, they probably are... Cam, can you make something with date and time calculation specs that Jarvis can look at? Or one of you send him something from your computer, or something?"

"I bet they're the same, we're both from Earths. Maybe there was a restandardization of how long a second is supposed to be at some point but it'll be at least loosely similiar." He calls up a clock app on his computer and holds it up for comparison.

"All measurements seem to correspond," Jarvis reports after examining the clock app's calendar and clock face and watching some seconds tick by. "That's convenient."

"Not complaining! So not complaining. Is it the same time of year?"

"No. April eighth for us, December twelfth for you."

"Anyway, unless you want this garage to get awfully more furnished than garages typically are, maybe you should put me in a guest room, how shall I locate such a commodity?"

"With my assistance," says Jarvis. The elevator dings open.

Into it goes Cam.

Cam gives her space right back. Wings folded, tail looped around his leg, arms crossed, standing in a corner.

"There are a multitude of rooms available on the second floor," says Jarvis. "You should both have plenty to choose from."

"Cool, thanks."