"Immortality can be achieved in a variety of ways, but the most straightforwardly commoditized is an enchanted ring that prevents further aging after that point. You can combine it with a trip to Natsuko's homeworld and use a local artifact to also become younger - and change anything else you'd like about your shape and appearance. The rings don't prevent violent death."

"So, extremely valuable to anyone who isn't a cultivator, less valuable but still valuable to anyone who is. --I'm curious what your medicine is like."

"I can heal basically any ailment in any humanoid - uh, or bird, for complicated historical reasons - with a touch," says Nelen. "Access to that magic system is very tightly screened, I'm the only one on this team who has it, but Natsuko can use a different magic system to heal most common things and Cassiel can do a lot too. If you have an acute need I can call in backup. For everyday purposes it's often cheaper and easier to use nonmagical medicine, which I don't personally know a lot about, but my understanding is it's pretty good."

"What counts as an ailment?"

"Injuries, illnesses, poisoning, the condition of being starving - I can't make hungry people feel full but I can make them not starve indefinitely if I'm in some weird situation where that makes sense - I'm not actually sure we've ever found a nonmagical problem that it couldn't cover. It doesn't cover all magical conditions, like if a Hex wizard causes you to sprout rabbit ears."

"What about really old injuries? A scarred-over stump, for example." 

"Both Natsuko and I can handle those."

"Father, if Nelen Utopia agrees, I would like to ask your permission to see if he can do anything for any of the remaining Zhenlong Chess Pieces."

"...You have permission." 

"What is a Zhenlong Chess Piece?" inquires Nelen.

"A victim of a forbidden technique for which Taxian-jun was infamous. Those affected lose all personal agency and sense of self and fall completely under the control of the person using the technique." 

"- I see. That doesn't sound like a physical problem but I'd be happy to try. We have some more mentally-oriented healers who might have luck with it if I don't."

"I think it would be interesting to know how your healing interacts with purely magical ailments. Of which not very many people are afflicted per capita, but they can be disproportionately disastrous." 

"Would you like me to check now?"

"...It isn't getting worse. If you'd rather not interrupt this conversation it isn't necessary."

"Checking is quick, and bringing in a psychic healer may not be, they're harder to come by than physical healers."

"I suspect that if you can't do anything for them then the problem is just that they're functionally dead. But it's not impossible."

"Where can I find them?"

"They're mostly used to guard particularly sensitive locations--follow me," she says, gesturing. 

Nelen follows.

She brings them to a door that two figures are standing in front of. 

The two figures are blank-faced in a way that speaks of excellent autonomic control and nobody whatsoever home. They're wearing uniforms different from the ones the ordinary guards were wearing, all in black. 

Nelen pokes one on the back of the hand.

The man's face shifts briefly from blankness to shock, and then he collapses to his knees sobbing into his hands. 

"I'm going to call that a promising result, under the circumstances."

"- would you like me to have him teleported to a place where we tend to put people who've had - supernaturally traumatizing experiences, or do you think he can likely recuperate locally?"