"O-kay. ...would an aetherial splint help? Uh, it would shore up the structural integrity of your... everything... and help you put less load on your actual body so you can recover more quickly."

That's sufficiently nontechnical, right? He still does not have the hang of explaining magic to people in a way that reliably enlightens rather than confusing.

".... Pppppprobably? I'll take it if it won't be using up any, er, general stuff that could be used on others? But I'm your test case, so. Go for it, mate."

"Everything I have is renewable, and outside of combat I can concentrate enough to make it last a lot longer and be more personalised."

He goes for it. The casting of this spell does take substantially longer than would be feasible in combat, any mage that took this long casting would be a sitting duck, especially with the flashy arcane geometries emerging from his book to float around him and build the aetherial construct. Once he's sufficiently confident in it, he pushes, and the lights vanish...

...Cynric will feel it immediately. It's not healing, exactly, it's not directly helping him regenerate or recover from damage. What it is doing is serving as a myriad of micro-crutches all over his body to lighten the load of using muscles. If you're not used to the feeling it's kind of weird, the way it selectively protects some parts of his body, but the overall effect isn't unpleasant.

"Oh," says Cynric, blinking. He relaxes a little, and gives a tentative smile. "That's... really nice, actually, thank you. Our local healing doesn't work like that, it's all - I mean I'm no expert but it's more healing the main damage and letting the body do the rest, not so much the, er. Feeling lighter and faster thing. Bet it synergizes very well, though."

He nods, then casts something quick that commands his fairy to do... something. She spins in the air and the area around them gets a faint haze of aether, and the air starts to smell nicer. Or rather, it stops having a smell altogether, which is a great improvement, really.

"This effect can last for as long as we're here," Otohiko explains. "It will do, uh, general regeneration, plus it'll take even more load off your body and use the fairy's energy instead of yours for it."

"What's the purpose of the fairy, exactly, out of curiosity?"

"...uhhh..."

"Is the answer very technical and going to go over my head?"

"...probably? She's, um, a focus, kind of, except not exactly just that..."