Chapter 399: 432Hz, Again.
The corridor was silent. The Heart hummed somewhere far above. The man whose name was on this door was, at this exact moment, being processed by Wardens in a holding facility somewhere across the city, his hands cuffed, his composure intact, his future about to be decided by people who weren’t on his side.
And his office was here.
Closed. Quiet. Holding whatever he’d left behind.
Raizen’s hand drifted toward the handle.
The door wasn’t locked. Raizen had expected resistance - a palm scanner, a code panel, something that would have given him a reason to walk away. There was nothing. Just an old brass handle, slightly tarnished, that turned smoothly under his hand and clicked the latch open with a soft, mechanical sound.
The door swung inward.
The smell hit him first. Old paper, ink, something faintly chemical underneath - the mineral tang of preserved compounds, maybe of lab samples sealed in glass. The air inside was way cooler than the corridor, dryer, the kind of dryness that suggested careful climate control rather than neglect.
The room was dark. It didn’t have a few big lights, like all the other labs in the Heart had. Raizen carefully stepped in, but before he could take another step, his foot crunched on something. He looked down. A piece of paper, folded into the shape of a triangle, lay near the threshold. He stepped over it. Took another step. Stopped.
The room wasn’t... A room anymore.
Every surface was covered. The walls - papered floor to ceiling in graphs, equations, hand-drawn diagrams. The ceiling - papered too, sheets pinned to the wood in overlapping layers, hanging slightly down where the corners had come loose. The floor near the edges of the room was covered as well, a layer of paper that had spread outward from the walls and started encroaching on the central space, leaving only a narrow path that led from the doorway to a single table in the middle.
Raizen’s eyes moved across it. Slowly. Trying to make sense of what he was seeing.
The papers weren’t random. They were ordered - grouped by content, by purpose, by some system that Eiden had clearly understood and had imposed on the room with the patience of a man who had spent a long time inside it. Sections of wall were dedicated to specific topics. A cluster of charts near the door. A grid with all the known spectrums covering the wall to the left. A series of progressively darker images that ran along the back wall and got harder to look at as they progressed.
The brass instruments sat on shelves between the paper layers. Old. Older than the building, probably - the kind of equipment that was made before standardization, each piece custom-built by someone who knew exactly what they wanted it to do. Ten sets of tuning forks of varying sizes. Resonance chambers with calibrated apertures. A device that looked like a pocket watch but wasn’t, its face covered in symbols Raizen didn’t recognize.
He didn’t touch anything. Didn’t dare. The room had the specific atmosphere of a place where everything mattered and one disturbed object could ruin an entire year of work.
He stepped further in.
The graphs on the walls began to clarify as he got closer. They were waveforms - sound waves, plotted against time, mapped onto axes labeled with frequencies he didn’t recognize as anything in particular. Most of the graphs were similar in structure. Two lines, traveling across the page from left to right.
One smooth.
One sharp.
The smooth line moved like a sine wave’s gentler cousin - rising and falling in slow, unpredictable arcs, climbing and descending with the patience of something that knew exactly what it was doing and saw no reason to hurry. It looked calm. The line of a thing that obeyed its own rules, not bothered by math.
The sharp line was its opposite.
It moved violently. Spiking upward in irregular bursts, dropping into deep valleys without warning, reversing direction mid-trajectory like it was being pushed by something invisible and very angry. The line had no rhythm. No pattern. It looked alive - looked like it was still moving, somehow, even though it was just ink on paper, even though the page had been printed, pinned to the wall and hadn’t changed in days or weeks or however long it had been there.
Raizen’s eyes wouldn’t stay on the sharp line. They tried to track it and slid off, the way eyes slide off something the brain hasn’t fully classified as a threat but is processing as one. The line looked as if it moved when he wasn’t looking at it. He was almost sure it moved, he just couldn’t prove it.
He swallowed. His throat was dry.
The smell of the room - old paper, dry air, the chemical tang of preservatives - pressed against his face.
He kept looking.
At the top of each graph, written in Eiden’s neat, controlled handwriting, was a frequency. The numbers ran in a sequence Raizen didn’t - special frequencies, maybe mentioned before. He’d never paid much attention.
Eiden had paid close attention.
128 Hz. 174 Hz. 285 Hz. 417 Hz. 528 Hz. 639 Hz. 741 Hz. 852 Hz. 963 Hz.
Each frequency had its own graphs. Each graph had the same two lines - the smooth one, the sharp one. The behavior changed depending on the frequency. At some, the smooth line was steady and calm and the sharp one was barely contained chaos. At others, the smooth line wavered slightly and the sharp one calmed down, as if the frequency had reached into the page and quieted something that didn’t want to be quieted.
Raizen’s eyes drifted to one frequency in particular.
432 Hz.
The graph beneath it was the most stable on the wall. The smooth line was beautiful here - clean, even, every arc identical to the next, every period perfectly measured. The page felt almost peaceful to look at, the way the Ukai’s Ruler’s music was peaceful, the way certain spaces in nature are peaceful for reasons that have less to do with their components than with their proportions.
And the sharp line, on the same page, was the second-most violent on the wall. Aggressive. Cutting upward and downward in jagged spikes that had nothing to do with the smooth line’s calm.
Raizen breathed out. Slowly.
He’d seen that smooth line before.
