He spent the rest of day eighteen doing nothing.
Not because he was tired, though he was. Because he needed to think before he acted, and acting on a new system while his body was still recovering from eighteen days in a geothermal trench seemed like the kind of decision that would cost him more than it gave.
The system documentation had been clear about one thing, the Archive cost lifespan. It hadn't said how much per session. He had ten extra years now, which helped, but he wasn't going to spend them blind.
He waited.
Days nineteen to twenty-two passed the way the Trench passed, slowly, hotly, without event. Perl left on day twenty. The other two men had gone so far inside themselves they were practically absent. He had the space to think and he used it.
What he needed from the Archive was specific. The Warden Collar was S-rank Voidcraft. That narrowed the pool of dead engineers who could actually help him. He needed someone who had built one, understood how it worked from the inside, and had left enough of an impression on the world to leave an Archive echo.
He worked through the available information, a scrap of packing material from a collar maintenance kit, the registration terminology on his own intake document, fragments of cultivation history the body's memory supplied.
He arrived at a name. Erren Voss. Ferrath engineer, roughly two hundred and forty years dead, one of the primary architects of the modern Warden Collar's third iteration. Died in his foundry. The official record said accident.
On day twenty-three he lay down on the cooler section of floor near the left wall and closed his eyes and reached for the Archive.
It wasn't like anything he had a reference point for.
The best description he could manage afterward was that a door opened somewhere behind his own thoughts. Not a metaphorical door. Something with genuine spatial weight.
He was still lying on the stone floor. He was also somewhere else, and both things were equally true at the same time, which he chose not to examine too carefully and simply accepted as the operating condition.
He thought the name. Erren Voss. Ferrath. Warden Collar. Two hundred and forty years.
The Archive searched. He felt it the way you feel a machine running in another room, not directly, but the vibration of it coming through the wall. Then something arrived.
A man. Compact, middle-aged looking, with the hands of someone who had spent a lifetime working with tools rather than performing the idea of working with tools.
He looked at his surroundings with the expression of a person who was curious rather than alarmed, which told him something about what kind of person Erren Voss had been.
He got straight to it.
"You built the Warden Collar system," he said. "Third iteration. S-rank."
Voss looked at him. "I contributed to it. The suppression array and the tracking mechanism. Not the kill switch, that was someone else."
"Tell me about the suppression array."
Voss studied him for a moment. Whatever the Archive did to people it summoned, it clearly included some awareness of the situation they were in, because Voss didn't ask why or make him justify the request. He just looked at him with the eyes of an engineer who recognized someone coming at a problem directly.
"The array runs a continuous low-frequency disruptive field," Voss said. "Three emitters in the inner housing, overlapping coverage. It doesn't block pathways, it degrades the signal quality below the activation threshold. The more Rimforce you push through the channels, the stronger the field gets in response. It's self-escalating."
"So fighting it makes it worse."
"That's the design."
"What doesn't trigger the escalation."
Voss paused. It was a thinking pause, not a reluctant one. "A Nullpath cultivator wouldn't. The field escalates in response to Rimforce activity. Nullpath doesn't produce Rimforce, it negates it. The field has no protocol for negation because Nullpath was already considered extinct when we designed the third iteration."
He kept his expression level. Filed it.
"The kill switch," he said. "You said someone else designed it."
"I said I didn't build it. I know how it works because we shared housing specifications."
"Tell me."
Voss told him. A charged Rimforce pulse stored in a crystalline cell at the back of the collar's housing. Discharged remotely by an overseer's command or automatically at boundary crossing.
The cell recharged passively from ambient Rimforce, so it was always full. At Grade Zero with no active cultivation to buffer it, discharge was nearly always fatal.
"Can the cell be drained without triggering discharge."
"Theoretically. A Rimforce sink in direct contact with the housing would draw the charge out slowly, below the discharge threshold. But the housing material is designed to prevent external contact with internal components."
"What breaks the housing barrier."
"A counter-frequency resonance matched to the specific alloy of the third iteration housing. It weakens the barrier temporarily. Long enough to introduce a drain." He paused. "I don't have the exact resonance frequency memorized. It's been a long time. I kept the specification in my personal workshop logs."
"Where."
"Under the foundry floor. I buried them when I realized my colleagues were going to be a problem." He gave a district, a street, a building on Ferrath.
He repeated it back once. Stored it.
Then the session ended. Not with announcement, the space just began thinning at the edges, Voss losing definition, the distant texture of the foundry fading out. He had one last impression of the man's face. Something that looked like satisfaction.
He opened his eyes. Trench ceiling. Flickering strips. Heat.
The cost arrived quietly. Not a pain. Just a tiredness that went deeper than muscle, the specific exhaustion of something spent rather than used. He lay still and assessed it.
Maybe a few years or so. Very expensive. He could not use it out of spite, he needdd to be careful. He would need to be careful about frequency.
He looked at the ceiling and thought about Ferrath. A foundry floor. A buried notebook. A resonance frequency that could weaken a housing barrier designed to be unbreakable.
He had what he needed to start.
He filed it, closed his eyes, and let himself actually sleep for the first time in days.
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