The treatment point got busier after the first probe came back.
A lot of that was the Guild finally moving.
Once Finn's report reached Eina, the quiet storage room near the sealed passage picked up two more clerks, a sealed document box, a second table for copied maps.
And so many warning labels that Rayleigh started to wonder if anyone had thought about just covering the whole door with one big sign that read, Do not touch the suspicious breathing wall.
"Rayleigh, if I put that on an official Guild notice, half the adventurers in Orario will go looking for the wall just to find out whether it really breathes."
"Fair," Rayleigh admitted. "Never underestimate the suicidal curiosity of people who get paid by the monster part."
She pressed a hand to her forehead. "Please don't call adventurers that in front of adventurers!"
"They know what they are."
"They'll still complain."
"They complain when the Guild saves their lives, so that's not exactly a clue."
She looked like she wanted to argue and couldn't find the angle.
Years of working with adventurers had a way of using up a person's good counterpoints.
She wrote another line on her board instead and went back to sorting access permissions, the way someone does when they've picked a hard job and are too responsible to walk away from it.
Airmid kept Alise on the examination stool for the better part of half an hour after the team got back.
Alise hated it.
She sat with her arms folded and her boots tapping the floor, and the pressure behind her eyes had faded and still, Airmid checked her pupils, her pulse, her Mind flow, and her reaction speed twice over.
There was no winning an argument against that kind of calm.
Every time Alise tried to insist she was fine, Airmid agreed in that soft voice of hers and kept right on with the checkup.
"I said I'm fine," Alise complained at last, not loudly enough to mean it.
"You are," Airmid said, two fingers light against her wrist. "I'd like you to stay that way."
Kaguya leaned on the wall nearby and made no effort to hide that she was enjoying this.
"Captain, you should be flattered. Airmid's giving your skull more care than you ever have."
"My skull's survived plenty!"
"Only because other people kept working on its behalf."
Ryuu, sitting beside Alise, nodded once. "Kaguya's right."
Alise stared at her. "Ryuu. Not you too!"
"I want you to stay fine as well," Ryuu said, and she meant it so plainly that Alise gave up.
From the equipment table, Rayleigh decided Airmid had it under control.
If he weighed in, Alise would accuse him of taking the healer's side, which was true and therefore best left unsaid.
Welf had already taken one of the broken markers apart and laid the pieces out across the worktable.
The annoyance he'd come back with had cooled into something more useful. Welf was easier company once he had a problem to chew on.
Aim his temper at a person and he got defensive; aim it at bad work and he got things done.
Tsubaki stood behind him with her arms crossed, her one eye narrowed at his sketch.
"A closed channel takes longer," she said. "You can't carve it after the marker's shaped. You build the core first, wrap the shell around it, and keep the contact points small enough that the tunnel can't bite straight down the line."
Welf's charcoal kept moving. "I know."
"Then why does this bit look like the shell'll crack if Gareth so much as breathes on it?"
"It won't crack."
"It will if you keep the side that thin. The idea's good, brat, but make the marker too delicate and you've just forged jewelry for a wall to eat."
"It has to hold Rayleigh's thread!"
"And it has to survive being thrown, hammered, dropped, stepped on, and insulted by Kaguya."
Kaguya raised a hand from across the room. "I only insult tools that disappoint me."
Tsubaki pointed at her without looking up. "See? Standards."
Welf scowled at the page, then scrubbed out the side line with the heel of his hand and drew it thicker.
Getting corrected stung him, but a flawed tool stung worse.
Rayleigh liked that about him.
He moved closer and set a hand on the edge of the table. "The inner thread doesn't have to touch the surface the whole time. Give me three contact points — one near the head, one at the center, one near the base. If the passage drains one, the other two can still tell me how the damage's spreading."
Welf looked up. "So it's less of a line and more like three anchors."
"Right. One anchor dies, I've still got two. All three go dark at once, and we know the passage isn't scraping from outside. It's swallowing the whole pattern."
"That'd be bad."
"Very. But at least it'd be bad in a way I can use."
Welf gave him a look. "You say things like that way too calmly."
"Panic hardly ever improves research."
Tsubaki snorted. "Liar! I've watched you panic over material costs."
"That's different. Money's real!"
Hephaestus came in just in time to catch that, which was unfortunate.
"Rayleigh," she said, in a voice sweet enough to be a warning, "did you just tell me money is more real than danger?"
He turned around, already regretting the last few seconds. "I said money is real. I didn't rank it against danger. That would be irresponsible."
She came to the table and looked over the sketches — Welf's design, then the wrecked marker, then the sealed door at the end of the hall.
The teasing went out of her face.
What replaced it was the quiet, serious look she got whenever her children were building tools for something that could kill them.
"Can you finish a working batch today?"
Welf straightened before Rayleigh could open his mouth. "I can."
Tsubaki slid him a look. "You can with help."
His ears went red. "I can with help."
"Better hahahaha."
Hephaestus smiled — not at his expense — and that got Welf to look away faster than any of Tsubaki's needling had.
"Then make them properly. We're not out to prove your pride in one night. We're trying to bring people back alive."
Welf nodded.
Alive hit differently than the rest of it.
Rayleigh picked up the broken marker and tapped the hollowed groove.
"I also want a separate charm. Simple enough that Alise can use it before her conscience drags her through a wall."
Across the room, Alise's head came up. "I heard that."
"You were supposed to."
Airmid pressed two fingers to Alise's temple before she could get to her feet. "Please don't move during the examination!"
Alise went still, then sank back down with the expression of someone bearing up under great injustice.
Rayleigh carried on like nothing had happened. "The fake voice had no living presence behind it, but in the tunnel that gap might not be obvious fast enough. So — a charm that reacts to nearby life. It won't identify anyone or prove anything clever. If the voice is only sound coming through stone, the charm stays cold. If there's someone alive on the other side, it warms."
Eina had drifted closer while he talked, already taking notes.
"Can non-specialists use it?"
"That's the whole point. If it needs me to read it every time, it's just another bottleneck. I'll make the first few, then teach Welf and Tsubaki enough to help build the bodies. The part that responds to life still has to come from me."
She wrote fast, then glanced at the sealed passage. "How many?"
"As many as my patience and Hephaestus's budget can stand."
Hephaestus looked at him.
"Ehem, as many as we need," Rayleigh corrected.
"Good."
Welf looked from the charm sketch to the marker design, and his face settled into the particular dread of a man doing the math on how much work was in front of him.
Then he grabbed a fresh sheet and started carving the job into pieces.
"Markers first," he said. "If we botch those, the charm doesn't matter, because everyone gets lost anyway. Tsubaki — I need thinner steel for the inner casing. Not too soft. If the channel warps when it's struck, the thread breaks."
Tsubaki grinned. "Now you're talking!"
Hephaestus watched the two of them, and something in her expression eased.
Rayleigh saw it and had the sense to keep quiet.
...
The forge room they used for the new markers was smaller than the main workshop but better for fine work — two furnaces, a wide stone table, racks of tools, and a window set high enough that no one outside could see in.
It heated up fast once Tsubaki got going, and Welf looked far more at home sweating over metal than he ever did in a treatment room with his own feelings jabbing him in the ribs.
Rayleigh took the spiritual thread cores.
Welf and Tsubaki worked the metal shells.
He had to explain the structure twice, then a third time in words that didn't sound like a lecture on things nobody else could feel.
It landed better once he put it in terms of heat moving through a blade during tempering.
"So if the heat only runs along the surface, the blade looks finished and fails on the inside," Welf said, holding a half-shaped marker in the tongs.
"Close. The thread's the part I can feel from a distance. The casing protects it. The three contact points let me touch it without leaving the whole thing exposed."
Welf frowned at the glowing metal. "Then why not hide all of it? No contact points at all."
"Because if I can't sense it, it's an expensive nail."
Tsubaki laughed from the second furnace. "A very fancy nail. We could sell it to nobles."
Welf's face twisted. "No."
Rayleigh glanced at him. "That sounded personal."
"Nobles buy good weapons and hang them somewhere stupid!"
Tsubaki nodded like she was at a funeral. "A tragedy every smith knows by heart."
Welf settled the casing and set it aside to cool. "A weapon that doesn't get used is just decoration."
"Careful," Rayleigh said. "Some decoration's expensive enough to cover rent."
It came out so easily that Welf didn't notice he'd loosened up until Tsubaki smirked at him for it.
The second he caught on, he got twice as serious about the work, which only made the smirk worse.
...
They worked through the afternoon.
The first two markers failed.
One cracked under pressure when Gareth tested it with more force than anyone had asked for, and the other held its outer shell but lost the center contact point the moment Rayleigh filled it.
Welf cursed both failures with the wounded dignity of a man whose craftsmanship had just been insulted by physics.
The third held.
Rayleigh filled the three anchors one at a time, then closed his eyes and backed off until the marker's signal thinned into the general noise of the forge.
The thread stayed steady.
He pushed on it lightly, doing his best to imitate the pull from the hidden passage, and one anchor flickered while the other two held.
Welf was holding his breath without realizing it.
Rayleigh opened his eyes. "That works."
Welf let the breath out through his teeth and tried hard not to look pleased. "Course it works. We fixed the stupid part."
Tsubaki propped her elbow on his head.
He shoved her off.
By evening they had nine usable markers and three life-check charms.
The charms were uglier than Rayleigh wanted, mostly because he'd thrown them together fast — flat metal tags no bigger than two fingers, sealed between thin layers of treated silver and stamped with a simple pulse pattern.
If a living person stood beyond a wall or a door inside a short range, the tag warmed and gave off a faint tremor.
If it picked up only sound, or magic residue, or the dead trace left in Lott's wound, it stayed cold.
In theory.
Rayleigh tested one on Tsubaki through a wall, then on Welf behind a closed door, then on Hephaestus, who wanted to know why her tag warmed faster than anyone else's.
"Because you're a goddess," Rayleigh said.
Hephaestus stared.
"And because you're very warm-hearted."
"Too late."
"Welp, i tried."
Tsubaki nearly dropped a tray, she was laughing so hard.
Welf, who'd been watching the charm with real interest, leaned in. "What happens if the person on the other side is dying?"
"The response weakens," Rayleigh said. "Unconscious but stable, it should still warm. Barely alive, it might only twitch. Dead, and it doesn't react at all."
Welf's face went quiet.
Rayleigh didn't soften it.
The charm was built for ugly situations, and dressing it up would only make it worse later.
Eina came back near sunset with Finn, and the room slid back into operation planning.