Fëanáro tries it. An angel conspicuously fails to appear. "Oh, my alt invented eidetic memory necklaces. That can't explain your alt's language proficiency, but it'll at least make learning new ones trivial for you."

"It's hard to get more trivial than inviting people to Endorë and asking them to draw on the floor," Cam points out. "But I do want one of those."

"Think it's magic, but you can try conjuring it in case I'm wrong."

"Yep, magic."

"Ah, well. I wonder if it's learnable or local. Also, whereas our Noldor stuck together very effectively through the war and then split afterwards, these Noldor nearly had a civil war and spent a few decades not speaking to each other and are now, if I'm reading the epilogue correctly, a happily reunited kingdom."

"I wonder what governs which things are the same or parallel and which are just different like that."

 "Once we have enough data points we can start theorizing."

And they spend a few days reading and - in Fëanáro's case, since he can't pick up the languages by having circles drawn - learning a few of them chosen nearly at random.

And they find the correct planet and shuttle down. They speak Quenya, it'll be fine!

There's a spaceship landing! That's odd! They don't get a lot of unannounced visitors and they've yet to really figure out economically efficient tourism that they can use to fund the end-scarcity-and-give-the-galaxy-freedom-of-movement long term project. 

Maitimo's on Jotunheim helping Loki end an ancient war or conquer a kingdom or whatever they're doing. So he watches from a few miles off while the ship lands and then pops over to greet the people disembarking.

And out pops a guy with wings and a tail. "Hi!" he says in what, if Findekáno checks, is actually Quenya - accented - and not Allspeak rendering something else as such. "We are the most interesting visitors you have had all forever probably, bet you arbitrary material objects."

"I bet you a Silmaril that you are only the second most interesting visitor I have had in all forever," he says. He does check. Actually Quenya. Huh. Still a safe bet, Loki once dropped on his head.

"Who're we competing with?" Cam says, getting out of the way so Fëanáro can emerge.

"Loki," he says. And then blinks at Fëanáro, and adds, "...what are you doing here?"

"We haven't met," he says. "I am a version of the person known to you from an alternate dimension."

"Well, you're pulling a solid second in the most interesting people I've met department," he says. "Welcome to Vanda Nosseo, headquarters of Project End Material Scarcity and Give The Whole Galaxy Freedom of Movement, I hope in your dimension we're doing something comparably interesting."

"Ooh, ending material scarcity, good stuff, my go-to solution for that won't scale here but I approve in principle!" Wag wag. "I'm not terribly up to date on what our yous have been up to, sorry, although I can drop a letter if you're urgently curious."

"...our yous? There are several?"

"They forked. I forget how many of you there are. Four? Something like that. One of 'em came along the last time I went scouting for strange universes but this time they stayed home."

"...okay. Want me to pop you to some guest rooms in the palace and we can compare notes? Forking is not a thing that exists here and if you've done a lot of scouting for strange universes than you're ahead of us, we've stuck to the two."

"Universes we're aware of are the one I was born in, four associated worlds, the one he's from, and the one we found last time we went universe-hunting. This is universe-hunting result the second. I would be delighted to compare notes."

And now they're in a guest room in the palace, exceptionally pretty. "We grew up in Arda, eventually left Valinor to go kill a Vala - we didn't have any idea how to do that but I think - " he nods at Fëanáro - "his plan was to drag out the fighting for three hundred years while he invented his way up to something that'd do it - only then he had a fit of paranoia about my father usurping him and lit the boats we'd been using to cross the ocean on fire, all familiar so far?"

"Ooh, teleportation," Cam says. "And, uh, no, we were very surprised to learn that there were boats involved. With sails. That presumably, like, float. Also nothing was on fire."

"At the time we did not have the teleportation. I can now pick up like a million people at will and singlehandedly and put them in another dimension, it's lovely, I'll teach you this afternoon but it takes five hours to learn and is excruciatingly boring.

...no ships? Nothing on fire? Want to give your version?"

"There were ships. Space ships. Faster than light ones! They're cool! I dropped in after some of the politics had already politicked though, maybe I'm not the best source of backstory."

"We also wanted to leave Valinor to go fight a Vala," Fëanáro says, "though I was pretty sure I didn't need three hundred years to jump high enough on the tech tree to do it - I might have been underestimating him - but Valinor and Endore are twenty-five lightyears apart and it would have been hard for ships to be involved. Yours were on the same planet?"