Dumbledore came to the Wulfhall on the twenty-first.
The visit had been arranged the previous week — a specific conversation that Dumbledore had requested in a letter that was more personal than his usual correspondence, written in the quality of someone who had been carrying a question for some time and had decided the question was worth asking properly.
They sat in the library, which had become the room for serious conversations at the Wulfhall in the way that the back step had been the room for serious conversations at the Burrow. Dumbledore had brought some more memory vials he had promised — the Flamel alchemy notes and the duelling memories from his youth— and placed them on the table between them without preamble.
'I have been thinking,' Dumbledore said, 'about the question I asked you in my office in March. What you are building toward. You answered then with enough to work with but less than the full answer.' He looked at Ron over his spectacles. 'I have a better understanding now of the full answer's shape. I would like to understand it directly, if you are willing.'
'I require an oath first,' Ron said.
'Yes,' Dumbledore said. 'I expected you would.'
He gave the oath — the same structure as the night of the third task, the same binding. Ron listened to the words with the attention he gave things that mattered and confirmed when it was complete.
'The mechanism of how I arrived here,' Ron said. 'Not the timeline, which I've told you about. The mechanism. I died in my previous life at thirty-two. A being offered me a choice — to inhabit a life in another world where my choices might change things that needed changing. I accepted. The wheel landed on Harry Potter's world, and on Ron Weasley specifically. I am a thirty-two-year-old who died and was given a second life in a thirteen-year-old body, with all of Ron Weasley's memories as my own and all of my own memories also present.' He paused. 'I am Ron Weasley. Completely. The soul fusion was total. But I am also the person I was before, and that person's knowledge is what I have been working from.'
Dumbledore was very still.
'A cosmic intervention,' he said.
'That is one way to describe it,' Ron said. 'The being was not specific about its nature. I did not press. I had a choice to make and the nature of the being offering the choice was less relevant than the choice itself.'
'And the future you came from,' Dumbledore said. 'The original timeline. You have told me the broad shape. What I have not asked — ' He paused. 'What I have not asked is whether the changes you are making are producing the outcome you hoped for. Whether the person you have become here is the person you intended to be when you accepted the choice.'
Ron looked at the library around him. At the east-facing light. At the shelves Hermione had specified and he had built from and which were now full of the things he had gathered across three years.
'Yes,' he said. 'More than I hoped for, in some ways.'
Dumbledore looked at him with the quality he brought to genuine questions — not the assessment, not the headmaster's attention, but the specific curiosity of a very old man who still found some things genuinely worth wondering about.
'What do you want?' Dumbledore said. 'When this is over. When the war is done. What do you want for yourself?'
Ron thought about this honestly, because the question deserved honesty and because Dumbledore, under oath, deserved the full answer.
'I want to fight this war with the tools I have,' he said. 'I will not limit myself to incapacitation if people I care about are in danger — I will do what the situation requires. But I will not cross the line of using innocents. I will not kill someone who has surrendered. If Death Eaters are captured I want their trials to be fair — no bribes, no Dementor's Kiss before the case is heard, no corruption in the process. I want them to serve time in prison for what they actually did, nothing more nothing less.' He paused. 'After the war I want to spend some years doing the things I've been putting off — the cooking, the photography, the traveling and the people I care about living their lives without the specific weight of what's coming. And then, eventually, I think I want to enter wizarding politics.'
Dumbledore was listening with the full attention he gave things he found genuinely important.
'The wizarding world in Britain is — ' Ron continued. 'It is several centuries behind where it should be, in terms of who it includes and what it values and how it treats the people it considers peripheral. That's not going to change without sustained effort from people inside the institutions. The Prophet acquisition is part of that. The legal work Hermione is building toward is part of that. I intend to be part of that too, when there's time to be.'
Dumbledore was quiet for a long moment.
'You are,' he said, 'perhaps one of the most considered fifteen-year-old I have encountered in a hundred and twenty years of encountering fifteen-year-olds.' He had the expression he showed rarely — not the benign mild thing, not the older thing, but something that was simply warmth, uncomplicated. 'I would like to make you a proposal.'
'I'm listening,' Ron said.
'I would like you to be my student for the year,' Dumbledore said. 'Not in the classroom sense — you have moved beyond what classrooms can offer you in most subjects. I mean battle magic. The specific kind of combat that the last war required and that this war will require, at the level I understand it. Not the duelling curriculum. The real thing — what I learned with and later against Grindelwald, the theory behind it, the practice of it.' He paused. 'I have been thinking about what this war requires and about what I can contribute to it specifically. What I can contribute is that I have done it before. I know what it takes. I would like to pass that knowledge to the person who is going to need it most.'
Ron held this. 'I accept.'
Dumbledore smiled — the real one. 'Good,' he said. 'We begin after the ritual. I understand you have one more.'
'The core expansion,' Ron said. 'I wanted to discuss it with you anyways before I performed it. The Ravenclaw journal describes it as the highest-cost of the available rituals — more demanding than the others combined, because it works on the core's fundamental capacity rather than its efficiency or the body's support systems. The journal recommends consultation with a senior practitioner before attempting it.'
'And you've chosen to consult me,' Dumbledore said.
'You're the most senior practitioner available,' Ron said.
Dumbledore looked at him. 'Show me the sequence.'
Ron produced the copy of the relevant journal section. Dumbledore read through it with the attention of someone for whom magical theory was a language and not a subject — moving through the sequence with the quality of reading rather than decoding, the specific ease of comprehension at depth. He reached the end and was quiet for a moment.
'The journal's author understood what they were doing,' he said. 'The theoretical framework is sound. The execution requires — ' He looked at the sequence again. 'The execution requires a degree of precision in the final stage that most people would struggle with. The tolerance for variance is very narrow.'
'I know,' Ron said.
'You believe you can maintain the precision.'
'I've been maintaining precision in high-demand magical work since second year,' Ron said. 'The Occlumency, the ward construction, the rituals I've already completed. The skill is there. The question was whether the theory was sound, which is why I wanted your assessment.'
Dumbledore looked at the sequence once more. 'The theory is sound,' he said. 'Perform it when you're ready. I would like to be present, if you're willing.'
Ron had planned to do it alone. He considered this for a moment. 'Yes,' he said. 'Alright.'
He performed the core expansion on the twenty-third,on the flat section of the Wulfhall's grounds at two in the morning.
Dumbledore sat on a folding chair at the edge of the working area with the quality of someone who had agreed to witness rather than participate. He had brought a thermos of tea, which Ron had not expected and which was entirely characteristic.
The ritual sequence took four hours.
The preparation was the most demanding part — the specific alignment of intent, physical state, and magical core that the journal required before the working itself could begin. He spent ninety minutes in preparation, the patient work of bringing every variable into the correct range, checking each one against the journal's specifications with the focused attention of someone for whom precision was not a goal but a standard.
Then the working.
He had been warned by the journal's author — a note in the margin, in the specific handwriting he had come to recognise across two years of working from the copy — that the core expansion produced a sensation that was unlike the previous rituals. The previous ones had been quiet, internal, the body doing something it needed to do. This was different. The core, expanding to its new capacity, produced a sensation of the entire magical field around him suddenly becoming larger — not overwhelming, not unmanageable, but present in a way it had not been before. Like a room he had been living in becoming twice the size it was.
He held the final stage for eleven seconds, which was two seconds longer than the minimum the journal specified and one second less than the maximum. The tolerance was three seconds either way. He was in the middle of the tolerance range.
He released it.
He sat down on the ground, which was the correct response to the completion of a four-hour ritual at two in the morning after several weeks of other rituals. He sat and let everything integrate and did not try to assess what had changed until the integration was complete.
Dumbledore, at the edge of the working area, was very still.
'Are you well?' he said, after a moment.
'Yes,' Ron said. 'Give me ten minutes.'
He sat in the August night with the Wulfhall's grounds around him and the stars in the specific quality of a clear night far enough from London to have some darkness to them and let the ten minutes be what they were.
Then he stood up and looked at Dumbledore.
He concentrated.
The mage sight had been present since the resonance enhancement — the ability to see the ambient magical field, the residue of practice work, the quality of wards. Since the core expansion it was different. More precise. What had been a general ambient perception was now a calibrated one — specific to individuals, readable in terms of magnitude rather than just quality.
He looked at Dumbledore.
The quality of what he saw produced in him the specific response of someone encountering a thing they had understood abstractly and were now understanding concretely. Dumbledore's magical core was — vast was not the right word, because it was not the size that was the most striking quality. It was the organisation. Decades — over a century — of discipline and development and the specific refinement of someone who had been taking magic seriously since childhood and had never stopped. The power was there, absolutely, the kind of power that was in a different category from anything Ron had encountered. But the organisation of it was what made it what it was.
He looked at himself — not directly, but at the ambient field around his hands, the quality of his own core as perceived from the outside.
What he saw surprised him.
Not as large as Dumbledore. Not remotely as organised — that was the work of decades he did not have. But the raw capacity was — he had not expected to be looking at something in the same order of magnitude. Not equal. Not close to equal. But the same conversation, where before he had not been in the conversation at all.
'What do you see?' Dumbledore said, with the quality of someone who already had a sense of the answer.
'The same conversation,' Ron said. 'Different fluency.'
Dumbledore was quiet for a moment. 'You are, Mr Weasley, a magical anomaly,' he said. 'The journal's rituals are not supposed to produce this result in someone your age. The third magical maturation at seventeen will expand it further.' He paused. 'I want you to understand something. Raw power is not what wins wars. Grindelwald had power comparable to mine. It did not make him invincible. What made the difference in 1945 was not that I had more — I did not. It was that I had more of the right kind, applied with more precision and better judgment, in the moment that mattered.'
'I know,' Ron said. 'Bellatrix and Moody -two of the greatest combatants of either side after the leaders- together at their best would struggle with you. Not because of the quantity of magic but because of how you use the power'.
Dumbledore looked at him. 'You can see them all now,' he said. 'The relative magnitudes.'
'Yes,' Ron said. 'Since the enhancement. This just makes the reading more precise.' He looked at the Wulfhall behind them, the house warm and lit in the August night. 'The training,' he said. 'The battle magic. I want to start as soon as we're back at Hogwarts.'
'Tuesday evenings,' Dumbledore said. 'After your Madam Pomfrey sessions.'
'Tuesday evenings,' Ron confirmed.
They walked back to the house in the August night, Dumbledore drinking his tea with the equanimity of someone for whom late nights in gardens were simply a category of thing that happened, and Ron thinking about the year ahead and what Tuesday evenings with Albus Dumbledore would produce.