Her name had been Sera Vane.

  Raka opened the notebook on the morning of the sixteenth day, sitting cross-legged on his bed with the curtain drawn and the rest of the dormitory quiet around him. The cover had her initials on the inside front page, written in a hand that had started neat and grown more economical over the years, the way handwriting does when someone has been writing for a long time and has stopped caring about appearance in favor of speed.

  The notebook was not a diary. It was a technical record — a Resonance user's working notes, compiled over approximately three decades of practice, failure, adjustment, and hard-won understanding. It was the closest thing to a manual that existed for an ability that had not existed, in any documented form, for three hundred years before Sera Vane.

  Raka read it slowly. He took his time with the early entries, which were recognizable in a way that made his chest ache slightly — the same confusion, the same involuntary triggering, the same bruises in the same locations. She had cracked two ribs in her first month at the academy. He had, so far, only damaged his elbow. He noted this as a qualified improvement.

  The middle entries were technical. She had spent fifteen years working out the mechanics of the ability before she had a coherent framework for it, and reading the process of that work — the dead ends, the partial successes, the moments of breakthrough written in underlined capital letters that he could feel the relief behind — was like being handed a map by someone who had walked the same territory and marked every wrong turn.

  The late entries were different in tone. More careful. More aware of what the accumulation of borrowing was doing to her body. She had developed a system — not for stopping the damage, which she wrote plainly was not possible, but for slowing it. Specific exercises. Specific limits. A framework for deciding which abilities to copy and how often, calibrated against what she knew about her own physiology and its rate of degradation.

  The final entry was dated eleven years ago. It was short.

  I am leaving this with Hale because I trust him to give it to the right person at the right time. If you are reading this, you have the ability. I am sorry for the parts of it that hurt. I am not sorry it exists — I never was, even at the worst of it. The world needs what we can do. That has always been enough for me. I hope it is enough for you too. Be careful with borrowed fire. It burns the hand that holds it just as surely as anything else. — S.V.

  Raka sat with the closed notebook for a long time after he finished it.

  Then he opened it again and began to read the technical sections a second time, more slowly, with a pencil, marking the parts he needed to practice.

  * * *

  He shared the relevant parts with the group at lunch — not the personal entries, which felt like they belonged to him in a way that the technical information did not, but the framework. The system. The method Sera Vane had developed over thirty years for managing an ability that was, by nature, unmanageable.

  'She had a limit,' he said. 'A daily limit on how much she copied and from how many people. She tracked it like a budget. If she went over, she took two days off from using the ability completely.'

  'And if she couldn't take two days off?' Damar asked.

  'Then she accepted the additional damage and compensated afterward,' Raka said. 'She was very clear that the damage is real and cumulative. But she was also clear that knowing it is cumulative means you can make choices about when it's worth it and when it isn't.'

  'That's a grim framework,' Lenne said.

  'It's an honest one,' Mira said.

  Raka nodded. 'She also left notes on specific ability types — what to expect when copying elemental versus physical versus temporal abilities. She had never copied Void-adjacent abilities, but she wrote that she suspected the risk profile was different and significantly higher. She advised against it without extensive preparation.'

  He did not look at Sena when he said this. He didn't need to. He felt Sena's small, acknowledging tilt of the head in his peripheral vision.

  'There's one more thing,' Raka said. 'She wrote about something she called resonance echo. When you copy an ability frequently from the same person, the connection between your Aether signature and theirs becomes easier to establish. Faster. More stable.' He paused. 'But it also means that person's Aether starts to affect yours even when you're not actively copying. Like a residue.'

  'What does that mean practically?' Tobas asked.

  You could be reading stolen content. Head to Royal Road for the genuine story.

  'It means,' Raka said slowly, working through it, 'that the people I train with most often become — linked to me. In a small way. Permanently.'

  The table was quiet.

  'Define permanently,' Lenne said.

  'She didn't fully define it,' Raka admitted. 'But she wrote that by the end of her career she could sense the Aether signatures of her six closest colleagues from across the city. Not read them. Just — know they were there. Know if something was wrong.'

  Lenne looked at her hands. Then at Raka. Then she picked up her fork and went back to eating with an expression of someone who has processed significant information and chosen, for now, to shelve it.

  'Useful,' Damar said. Just that.

  'Yes,' Raka said. 'That's what I thought too.'

  * * *

  Three days after the conversation with Hale, Mira came to Raka's alcove at an unusual hour — mid-afternoon, when she was normally in the library — and sat on the edge of his desk chair with the posture of someone carrying something they have decided to put down.

  'I haven't told you everything I found in the library,' she said.

  'I know,' Raka said.

  'You knew I was holding something back.'

  'You're always holding something back until you're sure of it,' he said. 'I figured you'd tell me when you were ready.'

  She looked at him for a moment with her slightly-ahead eyes. Then she opened her notebook to a specific page.

  'The Bael Register has a section about what the original Seven faced,' she said. 'Not the battle — I mean what led to the battle. The circumstances that allowed Arkhavel to get as close as it did before they stopped it.' She turned the notebook so he could read. 'It was a betrayal. From inside the academy. Someone gave Arkhavel information about the barrier's structure — how to apply pressure to the right points to create a controlled collapse. The same pattern that Damar found.'

  Raka looked at the page. At Mira's precise handwriting summarizing something that was three hundred years old and entirely contemporary.

  'The traitor in the original account,' Mira said. 'It was a senior faculty member. Someone with access to the academy's infrastructure. Someone who believed, like the faction Hale described, that Arkhavel's emergence was inevitable and that cooperation was more rational than resistance.'

  'History,' Raka said.

  'Recurring,' Mira agreed.

  He handed the notebook back. She took it and closed it and held it in her lap.

  'The traitor in the original Seven's time was someone they trusted,' she said. 'Not a stranger. Someone inside the group's circle. The Register doesn't name them directly — the account was written after the fact and certain things were redacted — but it's clear it was someone close.'

  'You're telling me this because you think the same pattern is repeating,' Raka said.

  'I'm telling you this because the pattern has already repeated once that we know of,' she said. 'The barrier points. The faction. The timing. It's the same playbook. Which means we should assume the person running it knows the playbook well enough to have read the original.'

  'Someone who has access to the restricted archive,' Raka said. 'The Underground one. The version of the Register with more detail.'

  'Senior faculty,' Mira said. 'Or someone who stole access.'

  They sat with this for a moment.

  'Not Hale,' Raka said.

  'I don't think so,' Mira said. 'But I want you to understand that I'm operating on judgment, not certainty. My ability shows me seconds, not character.'

  'Noted,' Raka said. 'What about Crane?'

  Mira was quiet for a long moment.

  'Crane knows more than she shows,' she said. 'That could mean she's protecting information from the wrong people. Or it could mean she is the wrong people.' She paused. 'I don't know yet. I'm working on it.'

  Raka nodded. There was nothing else to say about it that they didn't already know. He looked at his desk drawer, where the notebook sat, and thought about Sera Vane writing her final entry eleven years ago with the steady handwriting of someone who had made peace with not knowing what came next.

  Be careful with borrowed fire.

  It burns the hand that holds it just as surely as anything else.

  He was beginning to understand that she had not been talking only about the ability.

  * * *

  On the twentieth day, Kai spoke at dinner unprompted for the first time.

  This was notable enough that everyone at the Dormitory Seven table went slightly still, in the manner of people trying very hard not to appear to be paying attention while paying extremely close attention.

  'The perimeter check I did,' Kai said, addressing the table generally and no one specifically. 'I found something.'

  Nobody spoke. Nobody wanted to interrupt.

  'There's a location on the island's underside,' he said. 'Below the western ridge, where the waterfalls come from. There's a structure there that isn't on any map — including Damar's.'

  Damar put down his fork.

  'What kind of structure?' he asked.

  'Old,' Kai said. 'Older than the academy, I think. Stone construction, different material from the island's natural rock. The barrier is thin there — thinner than your seven points. And there are markings on the stone that I don't recognize, but that feel like Aether. Old Aether. The kind that has been sitting in one place for a very long time.'

  Sena had gone very still.

  'Void-adjacent Aether?' Raka asked.

  'Both,' Kai said. 'Something that bridges them. I couldn't go inside — there's a seal on the entrance that I couldn't erase my way through, which is new.'

  Lenne made a sound that might have been impressed.

  'You tried to walk through a sealed door,' she said.

  'I wanted to know what was inside,' Kai said. This appeared to be a complete explanation from his perspective.

  'The Underground Archive,' Mira said suddenly. She opened her notebook and turned pages. 'The academy records mention an Underground Archive. Restricted knowledge. I assumed it was below the main library building, but —'

  'It's below the island,' Raka said. 'Below everything.'

  They looked at each other across the dinner table in the far end of the Refectory, at the tables nobody else sat at, surrounded by the noise of an academy that did not know what was happening beneath its feet.

  'We need to get inside that archive,' Damar said.

  'We need a way past the seal,' Kai said. 'I'll work on it.'

  'How?' Tobas asked.

  Kai considered the question with what appeared to be genuine thought.

  'Carefully,' he said. And went back to eating.