What would you like done about ones that were falsely implanted?

"Leave 'em. Put 'em back, if you can, or I'll just dream them."

All right. It will take a few hours, do you want to get comfortable?

He sighs and sits in the grass.

It goes all fluffy.

And his memories come back into place. Several decades of the war and then several subjective decades of torture, just like that.

Shiver.

Is there anything else I can do for you?

"I - don't think so -"

All right. You can stay here as long as you would like.

He curls up in the fluffy grass.

They leave him to that.

He sleeps. He wakes up.

He gets back in the shuttle and it takes him back to the door.

In the bar is an Elf he'll recognize and a couple which he won't, and a human Macalaurë snuggling with a demon.

"I have no idea where this is going."

"Memories all back?"

"Not from my past life, but this one I don't think I'm missing time."

"Do you want an explanation now, or still no, it can wait."

"I don't think I'm going to guess, the setup is kind of all over the place."

"...is that a yes?"

"Go for it."

"Okay. This place is called Milliways. There are - a very very large finite number - of worlds, and Milliways is an interdimensional bar. Every once in a while the door will open on a world and people can walk in. The mechanism selecting the world or the people isn't known. The bar is sentient and can answer questions you have about this. She also gives good drink recommendations. 

Cam was born on a world populated by humans and technologically more advanced than yours, but not known to have any magic. When he was seventeen he discovered a book with instructions on summoning daeva - demons, angels, and fairies - from neighboring worlds. You draw a circle with instructions within it constraining the behavior of the daeva you fetch, and then you trade with them. He went public with this information, taught the whole world how to do it. Someone murdered him. He woke up in the realm of demons, as a demon. Demons can make arbitrary material objects. Anyone who has summoned a daeva and dies will become a daeva, so we're spreading it to various worlds as mortality protection - in most worlds humans don't get an afterlife. 

A hundred fifty years after Cam became a demon he was accidentally summoned by a child on a ship in a place called Araman, where the Noldor were departing Valinor to go fight Melkor. Their Arda was different than the one you're familiar with - about a hundred times the population, and Valinor and Endorë were separate worlds, orbiting different stars - do you know any astronomy -"

"Not especially."

"Okay. Most worlds - including the one you are from - are spherical. Their weight holds them together; down is in. Stars are the same thing, only even bigger, and on fire. The Arda you are from is flat because the Valar didn't know the relevant physics and didn't know how to make a spherical one. The Arda Cam landed in had marginally more competent Valar or something and their Valinor did not have any magic trees but was instead lit by two suns. Their Endorë was a separate world, in its own star system. Stars are very far away from each other; the trip between Valinor and Endorë was so far that it would take light twenty-five years to reach, and take people longer since we can go close to as fast as light but not quite. Then Fëanáro invented a way to cheat, and now the trip takes five days, but the ships that let you travel in five days were scarce. They asked Cam to make them a bunch more of them."

"I feel like this is elaborate enough to have deserved a better introductory paragraph."

"Is it elaborate enough that you can believe we are invested in it and are not going to ruin it to suddenly torture you?"