:To you as well. Coordinate with -: she thinks for a moment, :- Eldran, he is on site - the mages can Gate you out -: 

She takes a deep breath, and turns back to Fëanor. :We are ready to go: 

They all board the ship and fly back to Fëanor's house in Valinor.

Fëanor addresses the group once they get inside.

"Alright, we need to get the Stones out of this time as well—Thanos won't know to look here by himself but he does have Sauron with him, and Sauron's main disadvantage is that he can't time travel. If you go back really far, Valinor's defenses will be stronger, maybe strong enough to significantly slow Thanos if he does find you, and I'll be alive and willing to help you. I'd suggest, like, Y.T. 1250—that's after this house was built but before most of the drama started, so you won't end up in the middle of an unrelated brewing war. About 1800 local years ago."

Nayoki looks over at Savil, then down at her feet. She's mostly feeling too out of her depth to have an opinion about that decision. 

:That seems sensible. ...Is the plan that we take Leareth and Vanyel back to that time as well, or just the Stones? I suppose we want Leareth where the Space Stone is, so that once he is awake he can research how to use it for a Gate...?: 

:If I'm going back in time now, then someone's got to show me how to use this suit thing:

Savil has inherited Scott Lang's suit, which she's currently just carrying over her arm. 

"Yes, Leareth and Vanyel should go, you'll want to collect all the stones to that point and then return to the present once you have all of them."

Tony shows Savil how to put on the suit.

:I need to do Leareth's suit controls for him - Tony, show me how to get at it through your armour thing? And someone needs to go ahead to catch him: 

The Healers exchange suits from the Avengers who aren't coming back in time, and get instructions relayed from Savil. 

:I can manage - Thor, you can put me down if you want: 

Savil gives Vanyel a narrow-eyed look. :Ke'chara, are you sure? No offence, but you look like hell: 

He rolls his eyes. :Why do you always have to rub it in like that?: 

Leareth moans and shivers when Nayoki touches him, but doesn't wake up. 

"The suit should be able to hook into the time-travel hardware. I can control it remotely so it's linked to mine; if you'd rather control it yourself I can take the armor off him, but it's serving some medical functions at the moment."

"You should take this," says Fëanor, and offers Thor a Silmaril. "Past me will recognize it as his own work, though I won't have made them yet. It might help dispel any skepticism about being from the future. Also, you should probably go outside the house before traveling, so you don't scare us quite so much."

Thor puts Vanyel down gently and takes the Silmaril.

They all go outside, Vanyel leaning on Thor's shoulder, and travel back 18,000 years, as they would be counted on Earth.

The first thing anyone notices is that it's very bright. Everything looks about the same, except for the light—it's coming from somewhere on the western horizon, bright gold with a faint tinge of silver. If anyone's eyes are strong enough to look directly at the light source, they'll see that it's two huge trees, planted on a high hill to the west. (Those who have been to Valinor before can faintly remember seeing huge trees—but very dead and not glowing—in approximately the same spot.) They are also blindingly bright to Othersenses—not as bright as Infinity Stones, but physically larger, so that they might actually be more overwhelming to look at.

They walk back to the house and knock on the door.

The door is answered by a young, red-haired elf woman, carrying a dark-haired baby.

She says something in a language none of them understand.

Vanyel would like there to be LESS light he has a HEADACHE. He walks leaning on Thor, eyes squeezed shut, with Savil holding his other hand. He's definitely not looking at the Trees with mage-sight. 

Savil is and it's incredibly beautiful. Overwhelming, sure, but that doesn't make her want to look away. 

Oh, right, language barrier, obviously. 

:Can you understand me?: Nayoki tries, in Mindspeech. 

Yes. Who are you? Not elves, and I don't think you're Maiar.

:It is a long story. We are humans - your world has humans in the distant future, but actually I, and these others -: gesture at Vanyel and Leareth and Savil and the Healers, :all come from a different world. - Also from about 1800 local years in your future. In that future, there is a war, with a very powerful enemy, who... Who kills half of the people in the universe. It is a very big universe. Anyway, we are trying to fix that and we were working with your...husband?: is 'husband' right, she is suddenly drawing a blank on how Elf relationships work and it seems like she never thought to ask, :- with Fëanor. In the future. He gave us a magical artifact he made, to show his past self. Thor?: 

Thor shows Nerdanel the Silmaril.

"Half the people in the universe died" is probably not good information to drop on Nerdanel, who has never known literally a single other person who's died, for whom death itself is a distant legend, a thing that used to happen to them in the bad old days before she was born and is now easily fixable—especially alongside the existence of "other worlds"—what does that even mean?—and another species, though she had, at least, heard Men mentioned as something that would exist eventually. Nonetheless, she is married to Fëanor, and is not entirely unused to the unexpected. This is just—well, scale up her usual tolerance, she supposes.

That does sound very bad! she says. And yes, Fëanáro is my husband, he's away in the city giving lectures on the new writing system he invented, but I'm sure he'll want to hear about this—that does look like something he might make, she adds, looking at the Silmaril.

She osanwës Fëanor a brief wordless summary of what's going on.