He had started building the memory room in June.
It was the summer project he had given himself for the hours when he did not want to think about the war — the specific quality of work that was genuinely interesting and had a value independent of the immediate situation. The concept had come from the intersection of two things he had been working with for years: the pensieve, which allowed a single person to enter a memory and experience it fully, and the runic projection techniques from the Ravenclaw journal, which described methods for casting magical information into the ambient field of a space so that multiple people could experience it simultaneously.
The combination produced a room where memories could be projected from the rune architecture itself — not requiring a memory-holder to maintain the projection, not limited to one person at a time, the memory available to anyone standing in the room when it was active. He had been developing the runic sequence since June, working through it in the evenings when the house was quiet, the specific patient quality of someone building something they found genuinely interesting.
The room was in the Wulfhall's east wing, adjacent to the library. He had finished the basic architecture in July and had been refining it through August. By the first week of August it was operational at a level that could receive its first real memory.
He asked Harry on the seventh.
'I want to use the memory room for something,' he said. 'Specifically your memory of the duel with Voldemort. The full sequence — from when he rose to when you Portkeyed out.'
Harry looked at him. He had the quality he had developed since the third task — the lighter quality, the absence of the Horcrux's turbulence — but the specific subject produced something else in his expression, the quality of a person being asked to revisit something they had not forgotten and had not yet fully placed.
'Why?' Harry said.
'Training,' Ron said. 'Not just mine. Everyone who's going to be in the final confrontation needs to understand what Voldemort looks like in combat. What he does. How he moves. The specific quality of his magic at full deployment.' He paused. 'There's no other way to get that information. No record, no documentation. Only what you saw.'
Harry was quiet for a moment.
'It's alright if it's too much to revisit,' Ron said. 'I'll find another approach.'
'No,' Harry said. 'No, I'll do it.' He had the quality he had before the third task — the specific directness of someone who had decided the difficult thing was the right thing and was implementing the decision. 'If it helps people be ready for what's coming, I'll do it.'
He extracted the memory that evening with the pensieve — the familiar silver thread pulling from Harry's temple with the care of something that had been kept intact and would be kept intact. Harry sat very still through the extraction, which took four minutes, and when it was done he looked at the vial in Ron's hand with the quality of someone who had just put down something they had been carrying.
'How does the room work?' he said.
Ron described it — the rune architecture, the projection, the experience of standing in the room when a memory was active. 'You'll see it from your own perspective,' he said. 'The way you saw it. But the people in the room will be able to move through the projected space, observe from different angles, pause and restart.'
'Can I be there when you run it?' Harry said.
'Yes,' Ron said. 'It's your memory. You should be.'
He spent two days integrating the memory into the room's runic architecture — the specific careful work of connecting a living memory to a projection system designed for it. It required adjustments he had anticipated and two he had not, which he worked through with the focused patience of someone who had expected the unexpected and had prepared time for it.
On the ninth, he called the core group to the memory room.
Harry came and stood in the centre of the room beside Ron, with the quality of someone who had decided to witness rather than merely endure. The others positioned themselves around the space. Ron activated the projection.
The graveyard appeared.
Not dramatically — not the theatrical construction of a staged illusion. The projection had the quality of the real thing that it was — the dark, the cold, the specific terrible quality of a place where something had happened that had the weight of the actual event rather than the representation of it. The figures were exact: Pettigrew, the cauldron, the process of the ritual in its full horrible specificity. Voldemort rising.
The room was very quiet.
Ron watched the duel in the projection with the specific analytical attention he brought to the Moody duelling memories in August — the patterns, the magic's quality, the specific way Voldemort fought. Theatrical but economic. The magic of someone who had been doing this for fifty years and had long since stopped needing to perform it.
The Priori Incantatem. The golden thread. Harry holding it.
Ron looked at Harry beside him in the room — at the specific quality of someone standing in their own memory and watching themselves do something they had not fully understood at the time they were doing it.
Harry's expression was not what he expected. It was not distress, not the turbulence he had anticipated. It was the quality of someone encountering their own past from the outside and finding, in the externality, a form of understanding they had not had from within it.
'I held it longer than I thought I had,' Harry said, quietly.
'Yes,' Ron said.
'I didn't know if I could.'
'You could,' Ron said. 'You did.'
The memory ran to its end. The projection dissolved. The room was the stone room again, ordinary and quiet.
Ginny, who had not moved from her position near the door, said: 'We needed to see that.'
'Yes,' Ron said.
'We needed to see him,' she said. Not fear in her voice — the specific determination of someone who had encountered a thing fully and was deciding what to do with the encountering. 'So we know what we're actually preparing for.'
'Yes,' Ron said. 'That's why the room exists.