The medical wing kept Raka for two days.

  Not because the damage was immediately life-threatening — the healer who examined him, a calm Aqua fourth-year named Instructor Pell, was careful to say that nothing was broken in any way that wouldn't repair itself. But the pattern of the damage was what concerned her. The strain was distributed across too many points simultaneously, following lines that she said corresponded to multiple Aether channels firing at the same time, which was not something the human body was constructed to do without consequence.

  'You pulled from multiple sources at once,' she said. It was not a question.

  'Yes,' Raka said.

  'How many?'

  'Five,' Raka said. 'Simultaneously.'

  Pell looked at him with the expression of a medical professional encountering something that is outside the standard literature.

  'The manual says Resonance users are not supposed to do that,' she said.

  'I know,' Raka said. 'Is it permanent?'

  'The damage from this instance? No. The channels will heal in two to three weeks with rest. But the channels themselves have been altered. Expanded, in some places. Which means they can handle more than they could before.' She paused. 'But it also means the next time you do this, the damage will accumulate on top of existing structural changes. Over time, repeated multi-thread resonance will degrade your Aether channels in a way that single-thread use would not.'

  Raka nodded. He had expected something like this. Sera Vane's notebook had described accumulation in single-thread terms; he had extrapolated.

  'I understand,' he said.

  'Do you also understand,' Pell said, 'that I am going to have to include this in your medical record, which means the academy's senior staff will be aware of it?'

  He had not thought about that.

  'Yes,' he said, after a moment.

  She made a note. He lay in the medical wing for two days and read Sera Vane's notebook again, more carefully this time, looking for any reference to multi-thread resonance. She had written about it once, in a late entry, in a tone that he had now identified as her voice for things she had tried once and decided not to try again:

  I reached for three at once in the Veldris incident. It worked. I do not recommend it. The body is not a relay built for simultaneous frequencies and the fact that it can be used that way does not mean it should be. There are things your Aether can do that will shorten the time you have to do them. Choose carefully what is worth that cost.

  Three. She had stopped at three. He had taken five.

  She had thirty years of experience and she stopped at three.

  I have forty-five days.

  He closed the notebook and stared at the ceiling of the medical wing and made himself sit with the full weight of that for a while, without minimizing it and without letting it become something he couldn't move under.

  Then he got up and asked Instructor Pell if she had anything he could read while he waited for his channels to repair.

  She gave him a theoretical text on Aether physiology. He read the whole thing. It was useful.

  * * *

  Kai came to see him on the second day. This was unexpected enough that Raka spent a moment verifying that the chair in the corner of his room was actually occupied before he said anything.

  'The seal on the archive,' Kai said, without preamble.

  'You found a way in,' Raka said.

  'I found a way in,' Kai confirmed. 'It took three weeks. The seal is old Aether — not Void-adjacent like I said originally. I was wrong about that. It's a layered construct, very old, using techniques that aren't in any of the texts I could find. But there's a section in the lower right quadrant of the entrance where the construct thins. Not intentionally — the material it's anchored in has degraded over the centuries. The anchor point is weak enough that if I erase my presence completely and hold it for an extended period, I can pass through the weakened section without triggering the seal's response.'

  The author's tale has been misappropriated; report any instances of this story on Amazon.

  'You tested this,' Raka said.

  'I passed through the seal and back three times,' Kai said. 'Then I stopped, because going further alone seemed inadvisable.'

  'What's inside the entrance?'

  'A corridor. Stone. Very old, as expected. The markings I mentioned continue along the walls — Aether-script, I think, though not any variant I recognize. The corridor goes down. I didn't follow it alone.'

  Raka looked at his arm, wrapped in a soft Aether brace that Pell had fitted to support the healing channels.

  'Three weeks,' he said. 'For the channels to repair.'

  'I can wait,' Kai said.

  'No,' Raka said. 'Two weeks. And then we go in.'

  Kai considered this with his characteristic stillness.

  'The others?' he asked.

  'All of us,' Raka said. 'Whatever is down there, it's about all of us. We don't go in pieces.'

  Kai stood from the chair. He was at the door — or the space where the door was, the specifics of his movement never quite resolved into distinct steps — and then he stopped.

  'The multi-thread resonance in the tournament,' he said. 'You felt all of us at once.'

  'Yes,' Raka said.

  'What does that feel like?'

  Raka thought about how to answer this honestly.

  'Like trying to hold six different conversations at the same time,' he said. 'And like — knowing exactly where everyone is. Not physically. The signatures. I could feel all of you at once and I knew which one was which without having to think about it. It was — ' he stopped, looking for the word.

  'Complete,' Kai said.

  'Yes,' Raka said, surprised. 'That's the word.'

  Kai nodded once. Then he was not there, and then the door opened without anyone visibly opening it, and then the corridor was empty.

  Raka sat with the word complete for a long time after he left.

  * * *

  He was released from the medical wing on the morning of the third day with instructions, a follow-up appointment, and a look from Instructor Pell that communicated, without words, that she expected him to exercise judgment about the multi-thread resonance going forward and that she was not certain this expectation was well-founded.

  He walked back to Dormitory Seven through corridors that felt different than they had forty-five days ago. Not physically different — the stone was the same stone, the light the same light. But the way he moved through them had changed. He knew where things were now. He knew the stress points in the architecture, which Tobas's analysis had made visible to him through the borrowed perception. He knew which corridors Damar had marked on his map and why. He knew the frequency of Sena's listening as he passed the Void Observation Tower and felt her there, in the lobby below it, tilted slightly toward something the instruments couldn't hear.

  He knew all of them. The resonance echo had grown over the weeks of training, and the multi-thread moment in the tournament had deepened it past the point of simply sensing presence. He could feel the texture of each of them now, distinctly, in the background hum of his Aether awareness. Lenne's kinetic restlessness. Damar's measured stillness. Mira's forward orientation. Tobas's careful attention. Sena's divided frequency.

  And Kai — not quite an absence, but still the hardest to hold. A shape that the resonance recognized without being able to fully describe.

  The people whose signatures you carry become, in a small way, part of you.

  Sera Vane had known. She had always known.

  He pushed open the door of Dormitory Seven — the brass seven still slightly crooked, the wood still darker than the doors around it — and found everyone already there, which no longer surprised him the way it might have once.

  'Good timing,' Lenne said. 'Hale sent a message.'

  She held out a folded note. Raka opened it.

  I have identified two members of the faction. Both faculty. One junior, one senior. The senior member has level-seven access to the academy's infrastructure — sufficient to have created the barrier modifications you described. I need to verify before I name them. Be careful in the next week. The tournament result drew attention that may not be entirely welcome from the wrong quarters. Do not go anywhere critical alone. — H

  Raka read it twice. Then he folded it and looked at the room.

  'He's close to a name,' Damar said.

  'Close isn't there,' Mira said.

  'No,' Raka said. 'But it will be.' He looked around the common room. 'Two weeks. Hale gets his verification. Kai and I have a conversation we need to finish. And then we go underground.'

  'The archive,' Tobas said.

  'The archive,' Raka confirmed. 'Whatever the original Seven knew that we don't — whatever they left down there — we need it before the barrier fails.'

  The common room was quiet in the way it had become quiet over the past six weeks — not the quiet of strangers sharing a space, but the quiet of people who have stopped needing to fill silence to prove that they're comfortable.

  Outside, the academy went about its business. Classes, meals, the ordinary rhythm of a place that did not know what was happening in a dormitory at the end of the east hall, or below the western ridge of the island, or in the dark patience of something that had been waiting for three centuries.

  Inside Dormitory Seven, six weeks of accumulated trust and shared weight settled into the common room like a seventh presence — invisible, but felt by all of them.

  Two weeks.

  Then they would go down into what the academy had been hiding.

  And they would find out, at last, what the first Seven had known.