The resonance matching got cleaner over the next few days.

Not fast, not dramatically, just the steady accumulation of repetition doing what repetition did when you were paying attention.

The match came quicker each morning, the sympathy feeling in his chest easier to locate and easier to trust, and by the fourth day of the exercise he could produce a clean resonant match on the new stone within the first two or three attempts instead of spending half the session finding it. 𝗳𝚛𝗲𝕖𝕨𝕖𝗯𝚗𝚘𝕧𝕖𝗹.𝗰𝗼𝕞

Dian introduced a third stone on the fifth day. Then a fourth two days after that. Different compositions, different core frequencies, each one requiring him to start from scratch on the listening and work his way down to the core before he could match it.

The process was faster now than it had been with the first stone, which apparently happened naturally once you understood what you were looking for, but each new stone still had its own particular quality that couldn’t be assumed from the ones before it.

"You’re building a vocabulary," Dian said one morning, watching Xuan work through the third stone’s layers with his eyes closed. "Each frequency you learn is a word. Right now you have four words. It is not a language yet, but it is the beginning of one."

Xuan, who was in the middle of finding the third stone’s core and didn’t want to lose it, didn’t respond to that until he’d settled into it properly.

"How big does the vocabulary need to be," he said, without opening his eyes.

"Large enough that when you encounter something new, you have enough context to understand it quickly. The first stone took you two weeks.

The fourth took you a morning. Eventually it will take you seconds, because you will have heard enough variations that the new ones slot into place against the old ones. This is also why Sound Qi users become more dangerous with age, not less. Every year adds to the vocabulary."

Xuan opened his eyes and looked at the four stones lined up on the table. "So the ideal situation is to just live a very long time and listen to a lot of rocks."

"And other things, yes."

"Other things like what."

Dian gestured vaguely. "Wood. Metal. Water, which is complicated. Living things, which are considerably more complicated, because their frequency shifts with their state. A person’s resonance when calm is different from their resonance when afraid, which is different again when injured." He paused. "That is advanced work. Don’t think about it yet."

Xuan was already thinking about it, obviously, but he didn’t say so.

The projection training had shifted to account for the resonance work. Distance was less of a focus now, Dian having apparently decided that twenty-something feet with reasonable consistency was sufficient for the current stage, and precision was the thing.

He would set one of the stones at varying distances, sometimes ten feet, sometimes twenty, once at thirty-five which was toward the edge of reliable range, and Xuan’s task was to produce a resonant match and project it accurately enough to actually affect the target.

Affecting the target, it turned out, looked very different from what force-based projection had looked like. Force moved things. Resonance made them behave strangely.

The first time he landed a clean resonant match on the second stone from fifteen feet, it didn’t skid across the surface it was sitting on. It cracked. A small crack, a single clean line through the middle, as if the stone had simply decided to be in two pieces now.

Xuan stared at it.

"That’s what it does," he said.

"That’s what it does," Dian confirmed. "At low precision it displaces. At correct precision it disagrees with itself and fails along its natural fault lines." He picked up the two halves and looked at the crack. "Clean. You hit the core exactly."

"I wasn’t trying to break it."

"I know. You were trying to match it. Breaking it was just the consequence of matching it correctly at that frequency." He set the pieces down. "This is why precision matters more than force. You did not overpower that stone. You simply told it the truth about itself and it responded."

Xuan looked at the two halves for a long moment, thinking about what Dian had said earlier about living things having frequencies that shifted with their state.

He didn’t say anything about that. Just filed it in the place where he kept things that were going to be important later and moved on.

The strange presence to the north showed up again that evening, same as before, but something about it was different this time and it took Xuan a few minutes of sitting with it to understand what. It wasn’t closer, or not noticeably. It wasn’t louder or more distinct. The difference was that it was doing something.

The previous times it had just been present. A quality, a stillness that didn’t match the sect, something careful and contained. This time there was a faint pattern to it. Not sound exactly, more like a deliberate rhythm in the way it existed, a pulse, almost, very slow and very even.

He sat with it carefully, awareness loose, nothing that could be read as searching, and tried to understand what he was feeling.

It felt, distantly and imprecisely, like someone doing resonance work.

He sat with that conclusion for a moment, testing it against the feeling, checking whether he was pattern-matching onto something that wasn’t there. But the more he held it the more it fit. The slow rhythm, the deliberate quality, the sense of something being done with care and precision

. It matched the texture of what he’d been doing himself every morning, just filtered through distance and whatever was between him and the source.

He went inside and told Dian immediately this time, not because anything had changed in terms of urgency but because the detail felt important.

Dian listened. At the description of the rhythm, something behind his expression shifted.

"You’re certain about the pattern," he said.

"Reasonably. It could be wrong. My range isn’t that far and reading something at the edge of it isn’t exact."

"But your instinct said resonance work."

"Yeah."

Dian was quiet for a moment, which was a particular quality of quiet that Xuan had learned to read as him actually thinking rather than just waiting to speak.

"How long did it last," he said.

"Maybe seven or eight minutes. Then it stopped. Same as before, no fade, just gone."

Another pause. "Alright." He said it in the tone of someone concluding an internal conversation. "Continue what you’re doing. Note it when it happens. The same instruction as before."

"Are you going to tell me what it is."

Dian looked at him with an expression that was almost amused, not quite, but close enough that Xuan registered it. "When I have something worth telling you, I will tell you. Currently I have suspicions and suspicions are not information."

"Suspicions about what."

"About whether my suspicions are correct." He stood, straightened his robes, and looked at Xuan with something approaching directness. "There are people in the world who can mask their presence from awareness-based detection. Some are very good at it. Some are good enough that you would never know they were there at all."

He paused. "You are detecting something. Which means either the person responsible is not trying particularly hard, or they are not aware that someone in this sect has developed enough sensitivity to pick them up at this distance."

Xuan looked at him. "Or they want to be detected."

Dian’s expression didn’t change, but he didn’t dismiss it either, which was its own kind of answer. "Get some sleep," he said, and went to his room.

Xuan sat at the table for a while after that with his tea going cold in front of him. Four stones in a line on the table, the second one still in two halves, the crack clean and exact down the middle.

He thought about what Dian had said. Someone masking their presence, but not well enough, or not caring enough, or wanting to be noticed. None of those options were particularly comfortable to think about in the same context as the sect he was currently living in and the people he was currently responsible for to varying degrees.

Then he thought about the rhythm. Slow and deliberate, like someone who knew exactly what they were doing and was not in any hurry.

He picked up the first stone, the original one, and found its core resonance in the time it took to breathe in. Held it loosely, the way Dian had taught him, present without clutching.

Whoever was out there, they knew resonance work. That much he was fairly confident about.

Whether they knew he’d noticed them was a different question, and one that he found considerably more interesting and considerably less comfortable in equal measure.

He set the stone down and went to bed.

Tomorrow there would be more stones and more bells and more of Dian saying again with the emotional range of a wall, and that was fine. That was the routine and the routine was manageable.

But the north was still there when he closed his eyes, quiet and deliberate, doing whatever it was doing for whatever reason it was doing it.

He fell asleep thinking about frequencies and fault lines and the specific crack a stone made when you told it the truth about itself.