Leonardo's workshop had been rearranged.
Not reorganized — rearranged, the specific distinction of a space where everything had been shifted to create the maximum available flat surface for documents. The usual density of in-progress projects and reference materials had been pushed to the edges. The center table held papers in a pattern that suggested a presentation rather than active work: organized, positioned for viewing by someone standing opposite.
Trent stood opposite.
Leonardo let him look.
The blueprints were detailed. Whoever had worked from Leonardo's original sketches had done so with genuine understanding of the underlying mechanical principles — not copying, extending. The catapult modification wasn't just scaled; it incorporated a release mechanism that improved range by approximately a third, a refinement that required understanding why the original worked before improving it. The canal weapon — a modified waterwheel configuration with a rotating cutting element — showed familiarity with Venetian hydraulic conditions specifically. These weren't generic weapons. They'd been built for Venice's operational environment.
"The canal weapon," Trent said.
"Designed for harbor defense, ostensibly. The configuration would also work offensively — it can be positioned at a canal junction to prevent passage." Leonardo's voice held the flatness of someone maintaining professional detachment from something that required sustained effort to maintain. "If deployed in three of the four primary junctions we identified as Barbarigo logistical nodes, it would have made this campaign significantly more difficult."
"Why didn't they deploy it?"
"Marco preferred political tools to physical ones. These were probably reserve capacity — conditions-of-desperation options, or bargaining material with Borgia's actual military operations." Leonardo moved to the second document, the flying machine adaptation. "This one is further from combat use. They haven't solved the weight-to-lift problem my original design already had. The bombing configuration assumes you can keep the machine airborne long enough to reach the target." He looked at it. "You cannot. Not with current materials." A pause. "But in ten years, with incremental improvement—"
"Someone else solves the weight problem."
"Yes."
Federico was at the room's edge, doing the thing he'd developed for conversations that required his presence but not his participation — present, attentive, quiet enough that both parties maintained the ability to forget he was there if they needed to.
"What do you need from me?" Trent said.
"I need to know whether you want me to counter these." Leonardo looked at the documents, not at Trent. "Countermeasures — devices that detect or disable these weapons. Defensive intelligence. I can do that." A beat. "I can probably do more than that, if we're being honest about what I'm capable of."
"And the more?"
"Offensive applications. If I understand what they've built, I understand the principles well enough to improve on them." He looked up then, and his expression had the quality of a man asking a question he'd been assembling for some time. "Where does it end? I make defensive countermeasures, which requires understanding the weapons, which means I now know how to improve the weapons. I use that knowledge to defend against an attack, which means someone observes the defense and learns how to defeat it. The cycle—" He stopped. "I have spent my life building things to understand the world. Not to help people kill each other more efficiently."
The room was quiet in the specific way of a room where something true has just been said and the response requires care.
"I know," Trent said.
"The Templars stole my designs. They corrupted them." Leonardo's hands, on the table, had the tension of someone maintaining deliberate stillness. "I can fix what they corrupted. I can build better defenses. I can probably — probably — prevent specific attacks using the intelligence these documents contain." He looked at the blueprints. "But I am not building weapons for the Brotherhood. I am not creating things designed to kill people and calling it service to the cause. I need you to understand that before we discuss any of this further."
"All right," Trent said.
Leonardo looked at him.
"I mean it," Trent said. "Not agreement to negotiate. Agreement." He moved to the table, picked up the canal weapon design, considered it. "Countermeasures, detection, intelligence devices. Leonardo's full capacity deployed toward understanding what they've built and preventing it from being used. Nothing designed primarily to kill." He set the blueprint down. "If we ever reach a situation where an offensive application would prevent significantly greater harm — large-scale attack, civilian population, the kind of situation where the alternative is worse — we discuss it. Not you building and me authorizing after the fact. Discussion. You have veto authority."
The word veto landed in the room with its full weight. In the Brotherhood's structure, that kind of authority belonged to the senior Assassin. Trent had just given it to a contracted researcher for everything within his domain.
Federico made a small sound that might have been acknowledgment.
[LEONARDO ALLIANCE — CONDITIONAL WEAPONS DEVELOPMENT PROTOCOL. ETHICS CONSTRAINT: ACTIVE. SCOPE: DEFENSIVE + INTELLIGENCE. OFFENSIVE APPLICATIONS: REQUIRES BILATERAL APPROVAL.]
Leonardo looked at him for a long moment. "You could have argued utility. The pragmatic case is—"
"Clear. Yes." Trent looked at the weapons spread across the table. "The pragmatic case is clear, and if I made it convincingly you'd probably accept it, and we'd both know I'd persuaded you past a line you'd set for reasons that matter." He paused. "You've trusted us with considerably more than research access. Your workshop. Your cipher work. Eight months in Venice contributing to operations you could have declined." He looked at Leonardo directly. "The line matters. Keeping it matters."
Leonardo was quiet.
"The flying machine," he said finally. "The Templar modification has the weight problem wrong. I know the solution — it's not applicable to a bombing configuration, it requires a different fuselage design that reduces payload capacity to essentially nothing." He began rolling the blueprint. "But the solution itself is interesting. And defensively, a reconnaissance variant—"
"That sounds like your kind of problem," Trent said.
Something shifted in Leonardo's expression — not the complete resolution of everything that had been said, but the specific quality of someone who'd drawn a clear line and found the ground on his side of it firm.
"It is," he said. "It is exactly my kind of problem."
He moved to his drafting table. The weapons documents stayed on the center table, no longer positioned for presentation — they'd become reference material rather than agenda.
Federico moved beside Trent and looked at Leonardo's back, already bent over a clean sheet of paper, a fresh problem beginning to take shape under his hands.
"That went better than it could have," Federico said, low.
"He needed the line as much as the argument," Trent said. "He's been carrying those documents for three weeks."
Federico looked at the Templar blueprints. "The Borgia correspondence we took from Marco's warehouse. Does Rome know we have it?"
"They know the documents are gone. They don't know who has them." Trent picked up the canal weapon blueprint and looked at it one more time before setting it with the others. "They'll assume it was relevant to Marco's assassination — that the killer wanted proof of the Borgia connection, which is correct. Whether they conclude that intelligence has reached the Brotherhood specifically depends on how good their Venice intelligence network is post-Barbarigo."
"Which is now considerably weaker."
"Which is now considerably weaker." He looked at Leonardo working across the room — a small design taking shape, quick marks and quick corrections, the fluency of someone thinking fast. "We have time. Not unlimited time."
The courier knocked at the canal door before he'd finished the thought.
Rosa would have handled minor communications herself — she'd been managing operational contact for eight months without requiring this kind of interruption. The knock had the quality of something from outside the immediate Venice network.
Renato had the door. He read the exterior marking, looked at Trent, brought it over without expression — the tell, because Renato had learned to manage his face for most things and didn't bother for things he considered simply information.
The seal was Forlì. Not a Brotherhood seal — a political one, the kind that indicated official correspondence from someone who had the kind of position that used official correspondence.
Inside: a single page, formal register, in the handwriting of a secretary but signed personally.
Caterina Sforza, Lady of Forlì, requested a meeting with the Assassin Brotherhood.
The phrasing was specific — not Ezio Auditore, not the Florentine network. The Brotherhood. She knew what she was asking for. She knew, or had intelligence sufficient to believe, that the entity she wanted to speak with had an identity that went beyond a Florentine family name.
Trent read it twice, turned it over, and handed it to Federico.
Federico read it, set it on the table beside the Templar blueprints, and said: "Forlì."
"Forlì."
"That's not—" He paused. "That's further than Venice."
"Yes."
"We'd need to discuss the Venice network consolidation, the Lorenzo reporting obligation, the Florence council structure stability—"
"Yes."
Federico looked at him. "You already know what you're going to do."
Trent picked up the Forlì letter and filed it in his coat. "I know what we're going to do." He looked at Leonardo's bent back, at Renato already reviewing the afternoon's canal survey, at the Templar blueprints that had replaced the campaign map on the workshop table. "But I'm going to write Lorenzo first. He needs to know about the Borgia documents before he hears about them from somewhere else."
He found paper, found ink, and sat down to begin a letter that was going to require careful composition about several things simultaneously and that Lorenzo was not going to enjoy receiving.
Federico pulled the Forlì letter out of Trent's coat pocket while he was writing, read it again, and put it back without comment.
The canal outside moved through its evening business. Leonardo's pen scratched steadily, working out a problem that had nothing to do with weapons and everything to do with what he was actually for.
Author's Note / Support the Story
Your Reviews and Power Stones help the story grow! They are the best way to support the series and help new readers find us.
Want to read ahead? Get instant access to more chapters by supporting me on Patreon. Choose your tier to skip the wait:
⚔️ Noble ($7): Read 10 chapters ahead of the public.
👑 Royal ($11): Read 17 chapters ahead of the public.
🏛️ Emperor ($17): Read 24 chapters ahead of the public.
Weekly Updates: New chapters are added every week. See the pinned "Schedule" post on Patreon for the full update calendar.
👉 Join here: patreon.com/Kingdom1Building