He opened his journal to the protection notes from his work with the Flamels. Thurisaz as the core protection rune, its angular geometry projecting barrier energy outward. Isa for regulation. Eihwaz for structural binding, anchoring the field to a physical location. The same principles that governed every runic array, turned toward defence.
A building-scale array had to extend outward from inscription points at the boundaries of the space. Doorframes and window sills and corners, all connected by a continuous geometric relationship that maintained the barrier across the gaps between them.
He started with the front door. Two Thurisaz runes carved into the stone on each side at chest height, their projected barriers calculated to overlap across the full opening. Isa at the base of each doorpost, connected by scored channels. Eihwaz above the lintel, binding the array to the building's structure.
He activated it with a pulse of energy and felt the doorframe hum briefly before the runes settled into their stable configuration. The air in the opening felt subtly different. He tested it from outside with a mild Stinging Hex. The hex dispersed. The runes along the frame flared, absorbed the energy, and settled.
Over the next several evenings, he worked through the ground floor windows and then the upper floor, carving each array by wandlight while the others slept. Every opening got its own Thurisaz barrier, regulated and bound, until the entire building was covered.
It wasn't the same as a proper ward, which could adapt and respond intelligently in ways that static runic arrays simply couldn't. What he'd built would stop a casual hex and might slow down something stronger, but against a determined attacker who knew what they were doing, the barriers wouldn't hold for long. They were better than nothing though, and for now that would have to be enough.
By the time the ninth silver luminaire came off the press, two days before the shop was scheduled to open, Rowan sat down and wrote one more letter.
Dear Miss Inkwood,
I write to you from Number Four, Carkitt Market, where I have spent the summer establishing a shop called The Crucible. We will be opening our doors within the fortnight, and I wanted to offer you an exclusive first look at what we've built.
You were generous in your coverage of the International Youth Duelling Championship a year ago, and I expect your readers may be curious about what the youngest finalist in tournament history has been doing since. The answer, if you're interested, involves a new form of permanent magical lighting that requires no wand to operate and no maintenance to sustain. I believe it will change how witches and wizards think about illumination in their homes and businesses.
I am offering this story exclusively to you and the Prophet, ahead of any other publication. If you would like to visit the shop before opening day, I would be pleased to demonstrate the product and answer any questions.
The best days for a visit would be this Thursday or Friday, at your convenience. A photographer would be welcome.
With respect,
Rowan Ashcroft
Owner, The Crucible
Number Four, Carkitt Market
Those nine silver luminaires now sat in the display cases Clara had sourced and polished. The copper prototypes occupied a demonstration shelf, their amber warmth a deliberate contrast to the silver units' clean white light. Clara's description cards sat beside each piece.
On the morning of Inkwood's visit, Rowan checked the latest transmutation batch in the athanor and came downstairs to find Clara adjusting the window display. The luminaires filled the ground floor with an even light that made the space look twice its size.
"She'll be here at ten," Clara said, without looking up from the display card she was straightening. "What are you going to tell her?"
Rowan had thought about this. The Flamels' involvement had to stay out of the story entirely. Their privacy was the first concern. But beyond that, he didn't want the shop's success attributed to famous mentors rather than the work itself. The Crucible had to stand on its own merits if it was going to stand at all.
"Everything about the product. She can know the price, the materials, what the runes do, and how long it lasts. Let her write a piece that makes people want to walk in."
Clara looked up from the display card. "You don't think someone could read that article and work out how to copy you?"
"Eventually, yes. Someone will reverse-engineer the luminaire regardless of what I tell Inkwood." He'd been thinking about this for longer than she probably realised. "But if other artificers start making luminaires, or improving on the design, or building things I haven't thought of yet, then the wizarding world benefits. I'm not trying to be the only person who makes these."
"And when someone undercuts your price?"
"I'll already be building the next thing. My advantage is the process and the knowledge behind the product. The runic architecture may be visible, but the alchemical transmutation that makes the silver affordable is not, and neither is the press that makes production fast enough to be viable. Those are the real innovations, and they will stay secret in this workshop."
Clara considered that, then nodded slowly. "My instinct would have been to hide everything and let the product sell itself, but I suppose there's a reason you're the one with the business plan."