She'll fully support practicality.

What is the nature of the problem, exactly?

Vampires are, as a group, bloodthirsty unrepentant murderers. Humans smell extra special delicious, and it's hard to learn to resist the temptation to take a bite. There are exactly three that I know of that have not killed and eaten anyone, and one of them is my sister. She would like vampires to stop being compelled to eat people, and offer an incentivized non-people alternative that could persuade vampires that have been eating people for thousands of years and have grown accustomed to the delicious taste of it.

...This seems like a problem plausibly solvable with magic, he says.

Oh?

He pauses, thinking through what he wants to say.

...I came here from another world, and am originally from yet a different one. In the intervening world I acquired a kind of very powerful magic that I think could be used to assist in solving this problem. It is possible for other people to apply to its source. Attempts to acquire the magic take nine days each, and only one person can be evaluated at a time, but it is not dangerous to try.

Huh. Neat. Would it be useful towards your goal to have another person with this specific kind of very powerful magic helping you?

Potentially, yes.

Would you like to be properly introduced to my sister when she's calmed down a bit, then?

He nods.

If you would prefer that I speak your language, you can send it to me using this communication power, he says.

Actually I'd prefer to speak yours! Among vampiric perks is an improved memory. But I can get you mine, too.

I know several; it will take a few minutes to send them all.

Can we send languages at the same time? I could also send you all of mine if you'd like them, or a specific selection of them.

It can be distracting to send and receive at the same time. I'll send you mine and you can send back whichever you like.

He knows around ten languages at varying levels of fluency - his native Eivarne, and then Satni, Avashin, Northern and Eastern Hialene, and a handful of others; and last of all Aiha, which is completely unrelated to all the rest on every level and which he speaks with perfect native fluency.

Blair patiently waits, then responds in kind with fluent English, French, German, Spanish, Portuguese, Italian, Polish, Russian, several different branches of Mandarin, Japanese, Bengali, Hindi, Arabic, two forms of Latin (modern scientific Latin and old Latin in the proper pronunciation), Greek, Hebrew -

Then he pauses to check that Korovai actually wants more languages. He has more, but he sends the impression that this is enough to let him probably be able to speak to someone anywhere in the world. If he'd like to stop having more languages given to him, that would be perfectly understandable.

"This is fascinating," he says out loud in English. "If your sister won't mind the wait, I don't mind learning more."

"No, I expect her to be amused and say something mildly sardonic."

Languages! Turkish, Punjabi, Cantonese, Thai, Persian, Romanian, Ukranian, Welsh, Norwegian, Finnish, Dutch, Swedish...

This man knows a lot of languages. He apologizes for the eurocentricity of the languages, he's managed to pick up a lot of the major non-European languages, but hasn't had time to collect the minor ones and it's been very hard to get a lot of languages specific to Africa without actually going there, and he hasn't yet found the time yet.

He runs out. Eventually. He's not fluent in all of the languages he offers, but he typically knows enough of the basics to get across simple sentences and understand shorter ones.

"Thank you," he says, eventually.

"My pleasure!" says Blair, cheerily.

Korovai does not smile.

Yeah, Korovai does not seem like a smiling kind of person.

"Yvette's calmed down - she came within hearing distance for a little while to tell me she was okay, then left to give us privacy. She's probably experimenting upon an innocent rock with her magic for benevolent scientific purposes. It's the sort of thing she can keep at it for hours if she gets caught up in something." Meaning you do not have to drop everything to deal with her right now if you don't want to. "What do you want to do?"

"I'd like to hear more about the problem she is attempting to solve."

"Uh - there are some aspects I could explain to you myself - I'd be good for social and political parts, probably some behavioral and psychology too - but she'll be the one to talk to about the biological and scientific side."

"Then I will hear the social and related aspects from you and the scientific aspects from her."

"Fair enough. So, the way a typical vampire is turned is that they're kidnapped by a vampire that thinks they're worth turning for some reason. Typical reasons include mating onto the human - mate bonds are symmetrical when both parties are vampires - wanting to expand your group of vampires, or suspicion of magical powers upon turning. The consent of the human in question usually doesn't come up, it didn't with me. This illustrates how vampires don't typically see humans as people, and part of the situation newborn vampires are thrown into. To exacerbate this, turning itself is three days of what can kindly be called unfathomable and completely unmatchable agony. It is common, though not completely universal, to ask to die. It's hard to remember anything before the point of turning. I say this so you can get a complete picture of how much of a newborn vampire's previous life is ripped away at once, before blood even becomes a part of the picture. It helps explain the depth of the depersonalization."