"Imladris. It's a hidden city in the mountains, it was built as a refuge during the second-to-last war with Sauron."

"How many wars with Sauron are we talking about here?"

"Lots, but two major ones since Morgoth fell, plus Númenor."

"Well. I'm sorry none of me got here sooner."

"If you can stop him, yeah." They approach the main buildings."The last war was three thousand years ago so you'd have had to really get here early."

"One of me got to hers early enough that the Trees are still standing."

"...wow." He sounds vaguely longing. "But no Lúthiens who took on Sauron, so probably no worlds where my family existed at all?"

"Not found so far, no."

"Well. Welcome to Imladris. One of the last Elven settlements this side of the sea."

"It's really pretty," murmurs Gem.

"You've seen Menegroth, right?" He says it like someone might speak of Atlantis.

"What happened to it?"

"...the sons of Fëanor."

"Was somebody sitting on a Silmaril, is that what happened?"

"Yes. Lúthien's son - it's kind of a long story, and there's no one still alive from back then to tell it..."

"We've got resurrection that works on humans, if he's not just kicking around in Mandos - how do part-humans even work?"

"Dior - Beren and Lúthien's son - isn't in Mandos, he went - wherever humans go - as did his sons who died in the same fight. His daughter caught the attention of the Valar and they offered her and her descendants a choice. My father chose the Elven fate, his twin brother chose the human one.

...you can bring them back?"

"As with the killing Sauron thing I require someone who wants it really bad. And getting it done for the whole world as opposed to a single person requires six someones. But yeah."

"You won't have trouble finding those. The whole - world - that's millions and millions of humans, we don't have anywhere to put them -"

"My home planet holds billions, but it does it at a higher tech level. It's okay, we can find more planets."

"Okay." And they're approaching the city, if it can even be called that, and some people descend its stairs towards them. 

He's never seen Lúthien either.

He does recognize her. 

"...how?"

"There are more Ardas, this Lúthien is an alt of the local, disambiguating nickname Joy. And I'm Gem."

"More Ardas? 

Welcome to Imladris. Please come in and sit down and - Ardas where things went differently?"

"Yeah." In they go and down they sit. "This one is much later than any of the others were when found. Alts of me - or in one case my alt's daughter - keep landing on Ardas in various stages of the timeline and derailing them. The next oldest Arda has had a Sun for less than five hundred years. The youngest one may never get a Sun, it still has Trees."