"Are they... geopolitically threatening or do you just mean that you don't have a single-great-power-in-the-whole-world situation."

"They... aren't averse to conquest, but they're not very able to push the rest of the world around right now. They're still very powerful and would rather have more colonies."

"And the country in which I find myself?"

"It's a country. Countries like conquest. Despite what some people would have you believe, we haven't actually eliminated vice and greed by murdering the right set of children."

"...why would someone choose that in particular out of all the things to tell me?"

"Another species on this planet is famous for having done terrible things before they were all killed. Their souls still exist and try to reincarnate in human bodies sometimes, but they don't have human magic, so you can catch them and kill them while they're very young if you're so inclined, and then you'll have fewer people who completely lack any conscience and enjoy committing pointless atrocities."

"Wow! What the fuck!"

"Indeed."

"Is there any understanding of... why that would even exist as a thing. It seems like a weird way for a species to be!"

"I suppose the gods made them that way for some reason. What’s weird about it?"

"Nature is red in tooth and claw out of a ruthless indifference, not purposeful evil! And most things about a human, most of the traits you'd need to pass as a human well enough that your first tipoff would be magic powers, are things that evolved for - functioning in a social context with reciprocal relationships -

"- what's the species called please?"

"We mostly try not to call them anything. The others, or the old ones."

"What, does calling them things summon them?" Like bears? he doesn't say, because what if they believe this about bears too and he scares everybody.

"Probably not."

"They throw some other kind of species magic?"

"Not anymore. You can't do magic in a body of the wrong species."

"...weird. I'm gonna do some forensics..." Okay. He mentally labels the species Sociopaths. Were there any of them around five million years ago? Little sand-grain sociopaths?

They only showed up around the same time as humans, order of magnitude a hundred thousand or so years ago.

What did their bodies look like before they got genocided?

Humanoid, with claws and metallic irises.

And 'is a Sociopath in a human body' a conjurable parameter, does he get any of those existing e.g. now?

Yes.

"What're you doing?"

"Forensics! I can make stuff by copying existing stuff, or stuff that used to exist, and I can get very cute with 'copying', like this here is mostly glass," he sets the little figurine on the table. "So if it would be a terrible conversation piece you can smash it or whatever, I don't need it. Looks like they're not older than humans, as a species, and also I can tell the difference between humans and them even if they're in human bodies so I should be able to check people's fetuses at whatever age the soul usually attaches, so you can do abortion instead of infanticide about it."

"Not infanticide. Humans often can’t do magic before four or five."

"Kindergartenercide! That's arguably worse!"