The week passed. Mole returned the ritual manual on Wednesday with a note in her precise handwriting: I've read it. Don't make me regret this. She confirmed Clara's visit for the evening of the new moon. Lawrence spent every free hour in the Room of Requirement preparing the moonstone, separating it from the surrounding feldspar with a jeweller's loupe and fine chisels. The Room provided a workbench and steady light and the privacy to work without questions. Iris helped when she could, holding lights and cleaning fragments while Lawrence carved with the care of someone handling something that couldn't be replaced.
Clara arrived on the evening of the new moon, stepping out of Mole's fireplace in travelling robes with her hair pinned back and her hands buried in her pockets. Lawrence was already there. He hadn't spoken more than ten words all day.
Mole led them to the seventh floor. Rowan paced three times and the door appeared. Clara watched it materialise and said nothing. She looked at the door, then at Lawrence, then at Rowan.
"Let's get started," she said.
Blainey was waiting inside. The Room had configured itself as a ritual space: a cleared stone floor with silver guidelines already etched into the surface, a preparation table along one wall, and candles floating in a precise circle. The air was still and warm and the ambient magic hummed at a low, steady frequency.
Rowan had spent three hours that afternoon inscribing the ritual circle. Silver ink on stone, each rune drawn from the manual's specifications, each line measured twice. Lawrence had checked his work. Iris had checked Lawrence's checks. The circle was correct.
Clara stood in the doorway and looked at the room and then at her son and then at Rowan.
"You really think this will work."
"Yes."
"Lawrence," Clara said.
"It'll work, Mum." Lawrence's voice was rough and very quiet. "Please."
Clara took her hands out of her pockets. They shook. She looked at them for a moment and then walked into the circle.
The ritual took forty minutes. Rowan directed it from outside the circle, reading from the manual at first and then from memory as the procedure became mechanical. The moonstone, ground to a fine powder, was mixed with the powdered silver and dissolved in the spring water to create a luminous suspension that Clara drank. The liquid tasted of nothing, she said. The effect was immediate but subtle. A warmth that spread from her stomach outward, following the lines of her body, and wherever it reached, the shaking eased.
The circle's runes activated in sequence as Rowan fed magic into them. Silver light rose from the inscribed lines and wrapped around Clara in a slow spiral. She closed her eyes. Lawrence watched from the edge of the room with his fists balled at his sides and his face rigid and Iris stood beside him with her hand on his arm.
Blainey monitored Clara's vitals throughout, her diagnostic charm casting a faint blue glow that overlapped with the silver of the ritual. She said nothing. Her expression was focused and professional and gave nothing away.
The light peaked. Clara's hands, which had been shaking visibly when she entered the circle, went still. Completely still. The tremor that had lived in her fingers since the attack was gone.
Then the light faded and the runes dimmed and the Room was quiet.
Clara opened her eyes. She looked at her hands. She turned them over, spread her fingers, closed them into fists and opened them again.
She picked up her wand from the preparation table where she'd left it. Her right hand closed around it without hesitation, the grip firm, the fingers steady.
"Lumos," she said.
The light that came from her wand was small and ordinary and it was the most important spell Rowan had ever watched someone cast.
Lawrence made a sound that Rowan had never heard from him before. It came from somewhere deep in his chest and it wasn't crying exactly but it was close enough that Iris tightened her grip on his arm and turned her face away to give him a scrap of privacy.
Blainey ran her diagnostic charm one more time. She looked at the results for a long while and then looked at Rowan and didn't say anything. She didn't need to. The readout said it for her.
Mole, who had been standing by the door throughout, crossed the room and examined Blainey's diagnostic readout. She was quiet for a long time.
"Mr. Ashcroft," she said finally. "You continue to be the most difficult student I have ever had the privilege of teaching."
Clara hugged Lawrence. He let her. His shoulders were shaking and he'd buried his face against her neck and he wasn't trying to hide it and Rowan looked away because some things weren't meant to be watched.
After Clara left, escorted back to the fireplace by Mole, the three of them sat in the Room of Requirement. The ritual circle was fading on the floor, the silver ink losing its glow. The candles had guttered.
Rowan reached into his bag and set two cloth-wrapped parcels on the preparation table.
"There was enough moonstone for three doses," he said. "Clara's ritual used the largest piece. These are for you two."
Iris looked at the parcels. "Rowan."
He pushed the parcels across the table. "My core already expanded last year. These are yours."
Lawrence picked up one of the parcels. He turned it over in his hands the same way he'd turned his mother's letter the week before. He looked at Iris. Iris looked at Lawrence. Some wordless negotiation passed between them.
"All right," Iris said. "But the next time you decide to give away something this valuable, you could at least pretend to think about it first."
They performed the ritual twice more that evening. Rowan directed each one from memory, the procedure now familiar, his hands steady on the preparation table. The silver light rose and fell. Iris went first and came out of the circle looking slightly dazed and said that everything felt louder, as though someone had turned up the volume on her senses. Lawrence went second and said nothing when it was done, just sat against the wall for a while with his eyes closed and his hands open on his knees.
They walked back to Ravenclaw Tower together. The castle was quiet at this hour, the corridors empty, their footsteps echoing off the stone. Iris was running her fingers along the wall as they walked, feeling the texture of the stone as though she were noticing it for the first time.
They passed a suit of armour on the fourth-floor landing. One of the decorative ones, a full plate harness with a halberd propped against the wall beside it. Rowan glanced at it the way he always did and kept walking.
Then he stopped.
A suit of armour. A steel plate riveted together, held upright by a wooden frame. Mundane materials shaped by mundane hands. No magic in it at all.
The Ice Knight was made of ice. Frozen water. A physical substance with a melting point, a shattering threshold, and a tensile weaknesses along crystal boundaries. You didn't need magic to break ice. You needed mass and velocity.
The Knight absorbed magic. Every spell Rowan had thrown had made it stronger. Incendio, Confringo, Stupefy, all of it consumed and converted into more of what the Knight already was.
But a rock wasn't a spell. A rock was a rock. It had mass and momentum and no magical signature at all. If you threw a rock at the Knight, there would be nothing for it to absorb. Just stone hitting ice.
Rowan stood in the corridor looking at the suit of armour and thinking about rocks and ice and the difference between a spell and a thrown object, and the shape of the problem that had been sitting in his head for a week rearranged itself into something he could work with.
"Rowan?" Iris was five steps ahead, looking back at him. "You've stopped again."
"I know." He looked at the armour for another moment. He wanted to tell her. The shape of it was right there, clear and simple, and the Fidelius sat in his throat like a closed fist.
"Same thing as last time?" she asked.
"Yes."
She studied him for a moment. "You'll figure out how to tell me eventually. Or I'll figure it out myself."
They walked back to the tower and answered the bronze knocker's riddle and went to bed. Rowan lay in the dark listening to Lawrence breathe, deep and even and peaceful for the first time since August, and thought about rocks.