3rd Person POV
Nami stood in the middle of the living room, one high heel already in her hand like a weapon primed for launch. Her orange hair was still slightly damp from the bath, her nightgown slipping off one shoulder, but the fire in her eyes was pure business fury.
"You spent how much of Atreides' first-quarter revenue on Gremory reconstruction?" she hissed, heel dangling dangerously from her fingers. "Our projection was tight, Arto. Tight. One bad quarter and we lose momentum. And you just… gave it away? To fix damage you didn't even cause?"
Arto raised both hands in surrender, stepping into her space slowly, carefully. He reached out, plucked the heel from her grip before she could wind up for the throw, and set it gently on the coffee table. "I didn't give it away," he said quietly. "I loaned it."
Nami's eyes narrowed to slits. "Loaned. To whom? The Gremory family? They don't need loans—they need to stop letting teenage youkai with cursed blades turn their territory into a crater." Arto took one more step until they were almost chest-to-chest. His voice dropped, intimate, conspiratorial. "To Miyabi."
Nami blinked. "...Excuse me?"
"I didn't pay the compensation out of charity," he continued, fingers brushing a stray lock of orange hair behind her ear. "I paid it as debt. Miyabi's debt. She owes me every yen I laid out for those nine towns. And she's going to repay it with fifty percent of every bounty she collects from Section 6."
Nami stared at him. The anger didn't vanish—it just shifted, recalibrating like a compass finding true north. "You're betting on her," she said slowly.
"I'm investing in her." Arto's smile was small, sharp, and utterly confident. "Think about it, Nami. Section 1 through 5 are crippled. Word's already spreading: Gremory's frontline is weak. Strays are going to smell blood in the water. Low-ranks first, then mid-ranks, then the S-ranks and above who've been waiting for a chance to slip across the border and hide."
He leaned in, voice dropping to a murmur against her ear. "And who do you think is going to meet them?" Nami's eyes flicked toward the window. "Section 6," she whispered.
"Section 6," Arto confirmed. "The only section still at full strength. And at the tip of its spear is the girl who just tamed an SSS-rank cursed blade that leveled nine towns in three days. Tailless is awake, obedient, and hungry for something other than innocent blood now."
He pulled back just enough to meet her gaze. "Every high-rank stray she puts down is a bounty in the millions. Fifty percent flows straight back to us. Within one month—maybe less—every yen I spent will be repaid. With interest. And every town she protects from now on becomes living proof that Gremory didn't just survive the catastrophe… they turned it into a deterrent."
Nami's lips parted. "You're turning her into a living shield," she said softly. "A warning written in stray corpses: 'Cross this border and Hoshimi Miyabi will find you.'" Arto nodded once. "And the more she protects, the more people remember she's not just the girl who destroyed nine towns—she's the girl who stopped the tenth. The eleventh. The twelfth. Public opinion shifts slowly, but it shifts. Kanto will keep hating her for years. But Gremory? Gremory will start seeing her as theirs. As someone who chose to defend this land instead of running from it."
He brushed his thumb along Nami's jaw. "And when that shift happens… when the people she's protecting start calling her by name instead of 'the massacre girl'… she'll have a choice to make. Stay loyal to the place that gave her a second chance, or return to a homeland that still wants her head on a pike."
Nami exhaled slowly, anger bleeding out of her posture. "You played the long game," she murmured. "Again." Arto's smile turned crooked. "I always play the long game, love. You know that." She studied him for a long moment, then reached up and tugged him down by the collar until their foreheads touched. "If that money isn't back in Atreides accounts in thirty days," she whispered against his lips, "this heel is going through your skull. And I'll aim for the pretty face."
Arto chuckled low in his throat. "Deal." He kissed her—slow, deep, promising—and when he pulled back, the fire in her eyes had shifted from fury to something warmer, sharper, more dangerous. "Thirty days," she repeated. "Thirty days," he agreed.
Then he glanced toward the hallway where Miyabi slept. "And when she wakes up tomorrow," he added softly, "we start turning a massacre survivor into the best damn stray hunter Gremory's ever had." Nami's lips curved. "Better make sure she doesn't miss any payments."
Arto laughed quietly. "She won't."
[Timeskip: Brought to you by chibi Arto receiving payment at constant rate as Miyabi starts repaying her debts, even chibi Nami was surprised]
The blackboard had three words on it...Project: Counterspell...Arto picked up the chalk again and drew a horizontal line across the center of the board. Clean, straight, the practiced line of someone who had drawn this particular diagram in his head many times before committing it to a surface.
He marked the center point. Drew an arrow to the right. Drew an arrow to the left. Numbers appearing above the right side of the axis. Positive. Standard. The notation familiar to anyone who had spent months working with the Spellcrafting Formulas, which was everyone in this room.
He set the chalk down and turned to face them. "Before I explain what's on the board," he said, "I want to talk about a battle." The room shifted slightly — the specific shift of people recognizing that a reference is personal rather than theoretical.
"The Dark Arena," he said. "When you came in to pull me out." He looked at Rias, Akeno, Robin, Nami. "The four of you against the Arena using me as its final weapon." A pause. "I have reviewed that battle many times since. Not the emotional content of it — I am aware of the emotional content. I mean the tactical record. The pattern of what happened and why."
Robin was already very still in the way she became still when she had identified the direction of a conversation and was preparing to receive it fully. "You are good," he said. "All four of you. By any reasonable standard you are exceptional users of systematic magic, which makes you more capable than the vast majority of practitioners in this world who are still working on instinct and talent." He paused. "You still couldn't keep up."
Nobody contested this. "The Arena using my form had two processing steps for every spell it deployed," he said. "Identify the desired effect. Weave the formula. Two steps, active side, continuous output." He looked at them. "You had three. Identify the incoming spell's effect. Determine the counter-effect required. Weave a formula that produces that counter-effect." He paused. "One extra step. That's all the gap was. One extra step."
"And one extra step at that speed," Nami said, "is everything."
"At that speed," he confirmed, "it is the difference between response and reaction. Between being on the same footing and being permanently one move behind." He looked at Robin specifically. "You closed the gap with processing speed. When the Arena matched your processing speed, the gap reopened."
Robin inclined her head slightly. Acknowledging. "So I started thinking about the gap," he said. "About what creates it and whether it can be closed by something other than speed." He turned to the blackboard. "And I came back to the axis."
He picked up the chalk. "Magic as you currently practice it," he said, writing as he spoke, the notation appearing above the right side of the line, "operates in the positive. Every spell is a construction — a bending of stable mana flows into a specific effect through the application of formula and intent." He marked several points on the positive axis. "Different magnitudes. Different complexities. Different effects. But all of them the same structural operation — take stable mana, shape it, produce an outcome."
He drew a point on the positive axis. Labeled it: Spell A.
"Now," he said. "Someone casts Spell A at you. In the current framework, your response is—" He drew two separate operations on the board, working them out in the notation they all recognized. "Step one. You identify Spell A's effect. You determine what effect would neutralize it — call that Effect B. Step two. You identify a formula that produces Effect B. You weave it." He drew the result. "Spell B meets Spell A. They cancel. You are safe."
He stepped back from the board. "The mathematics work," he said. "Spell A and Spell B have the same magnitude with opposing effects. They produce zero." He paused. "But look at what you actually did."
He wrote it out explicitly: Spell A + Spell B = 0
"Two spells," he said. "Two full constructions. Two separate weavings. And here is the thing I want you to look at carefully." He underlined the equation. "The mathematics say they cancel because they are equal and opposite. But they are not equal and opposite in their structure. They are completely different constructions that happen to produce a null result when combined." He looked at the room. "You made two things to produce nothing. That is the inefficiency. That is where the extra step lives."
Koneko, on the floor, had shifted from her relaxed position to the particular upright attention she produced when something had engaged her completely. Kuroka beside her was leaning forward with the focused curiosity she usually reserved for things she genuinely hadn't encountered before.
Kiba was very still. "The simpler operation," Arto said, turning back to the board, "is this." He wrote: Spell A + (-Spell A) = 0
"Not a different spell," he said. "The same spell. With a minus sign in front of it." He paused. "In arithmetic, putting a minus sign before a number gives you its additive inverse. Same magnitude. Opposite sign. One operation, no separate construction required — you take what exists and you reverse it." He set the chalk down. "I want to do that with magic."
The room was very quiet. "The minus sign here," he said, "does not mean an opposite effect. That's the critical distinction and I need everyone in this room to hold it carefully." He wrote on the board:
Opposite effect ≠ Reversed structure
"An opposite effect is a separate construction," he said. "Fire and water. Force and barrier. You build something new to counter something existing. Two constructions, two weavings, two steps." He drew a line through the first formulation. "The reversed structure is different. If a spell works by bending stable mana flows into an effect — gathering, shaping, fixing — then its structural reverse works by doing exactly what the name says." He wrote on the board:
(-Spell A): Dissolves a spell's structure back into stable mana flows.
"Not fighting the effect," he said. "Not countering the effect. Reversing the process that created the effect." He looked at the room. "A spell is mana that has been shaped. The minus of that spell is the unshaping. The release of the shaped mana back into the ambient flow." He paused. "Not destruction. Not opposition. Reversal. The most natural process in magic — because shaped mana, without maintenance, always wants to return to stable flow anyway. We are not fighting the spell's nature. We are accelerating it."
Rias was looking at the board with the expression she had when something was reorganizing her existing understanding rather than adding to it — not confusion, but the specific cognitive experience of a framework shifting to accommodate something that didn't fit the previous version. "That's why it's a nullifier," she said slowly. "Not a counter. It doesn't produce a new effect that cancels the old one. It just—"
"Removes the spell from existence," Robin said. Her voice was the careful voice of someone thinking aloud with full awareness that what they were saying was significant. "The mana disperses. Harmlessly. Back into the ambient field." A pause. "There is no collision. No explosive cancellation. No residual effect from two opposing constructions meeting." She looked at Arto. "It disappears."
"It disappears," he confirmed. "And the processing requirement," Nami said. She was in the middle-distance mode, building the model. "If you don't need to identify the counter-effect — if you don't need to construct a new spell at all — then the three-step process becomes—"
"Two steps," Arto said. "Identify the incoming spell's structure. Apply the reversal." He looked at her. "Same as the active side. Identify the desired outcome. Apply the formula." He paused. "The gap closes. Not through speed. Through structural equivalence."
Nami looked at the board. At the equation. At the minus sign that was not a separate construction but a single additional notation on an existing one. "That's," she said. And then stopped. Because Nami, who had a word for most financial and mathematical things, did not immediately have a word for what she was looking at, which told Arto more about the scope of what he was proposing than any of the reactions that had involved words.
"Elegant," Robin said. Quietly. The word of someone who had processed enough of the structure to see its shape. "The worst case," Akeno said. Everyone looked at her. She was looking at Arto. "You said," she said carefully, with the deliberate pace of someone quoting rather than paraphrasing, "that in the worst case, when you lose your mind to someone—" She paused. "You said they could stop you."
The room absorbed this. The specific weight of it. Arto had said it simply, in the list of reasons for the project, alongside the tactical efficiency argument and the processing gap solution. He had said it without emphasis, which was how he said the things that mattered most — without emphasis, because emphasis was a tool of performance and this was not performance.
"I am the strongest user of Spellcrafting Formulas in existence," he said. "By a significant margin. Not because I am more talented than any of you — talent is not the framework we work in. Because I have been using this system for longer than most civilizations have existed, and the depth of the formulas I can access and the speed at which I can access them is—" He paused. "If something takes my mind. The way the Tailless took Miyabi. The way the Dark Arena took me in sleep. If that happens in the waking world, with full access to what I know—"
He did not finish the sentence. He did not need to. Koneko was very still on the floor. Kiba had his hands folded on his knees with the careful composure of someone processing something and choosing not to show the processing.
Kuroka was looking at Arto with the specific expression of someone who had spent years running from a situation where the person protecting her had become the threat, and who was, without any visible movement, having a private reaction to what she was hearing that was considerably larger than what was showing on her face. "You designed a counter for yourself," Grayfia said.
From the window. Quiet. The precision of someone stating a thing exactly as it was. "I am designing it with you," he said. "Because I cannot design it alone. Not because the theory is beyond me — I have been working on the theoretical framework for three months. But because a system designed by one person to counter that person has a structural weakness that is obvious once you name it."
"You would know where the gaps are," Robin said. "I would know every gap," he said. "Consciously or not. A blind spot built into the architecture by the architect." He looked at Robin. Then at Rias. Then at each of them in turn. "You don't have my blind spots. You have different ones, which means the gaps you leave are not the gaps I would leave, which means the combined architecture is more complete than anything I could build alone."
Nami had been looking at the second axis on the blackboard with the expression she wore when she had found what she believed was an inefficiency in a proposed structure — the focused, slightly narrowed quality of someone who had identified a shorter path and was preparing to present it. "The new sigil set," she said.
Arto looked at her. "Why do we need it?" she said. "We already have sigils with opposing directional bends in the existing framework. If Counterspell operates on reversed structure — the unmaking of a bend rather than a new construction — then the sigils that bend in the opposite direction of the target spell should produce the reversal naturally." She paused. "We use what we have. The new grammar you're proposing adds months of foundational work before we can build anything testable."
The room considered this. It was, Arto noted, the kind of objection that sounded correct on first pass. The kind that a sharp mind produced when it had understood the surface of a concept and was applying existing tools to it before the full depth had been examined. He had been waiting for it — not from Nami specifically, but from someone, because the objection was the natural next question after the minus sign explanation and the person who asked it first was simply the one whose pattern-matching had moved fastest.
"Chapter Two," he said. Nami looked at him. "Of the Spellcrafting Formulas," he said. "The sigil architecture section. Basic theory." A pause, entirely without condescension but with the particular quality of a teacher who has identified the exact page where the answer lives. "Read it again sometime. The relevant passage is approximately forty pages in."
Nami's expression shifted to the expression she made when she was being redirected to foundational material — not offended, because she was too precise a thinker to mistake a correction for a criticism, but with the specific quality of someone noting that they had apparently missed something and intending to locate it immediately.
"The sigils," Arto said, turning back to the board, "do not bend mana flows under one criterion. They bend under two." He wrote on the board:
Sigil parameters: (1) Direction (2) Degree
"Direction is what most practitioners think about," he said. "The bend goes this way rather than that way — inward, outward, clockwise, expanding, contracting. The directional component is legible. It's the part that maps to effect in the most obvious way." He drew several sigil notations on the board, the shorthand from Chapter Two's taxonomy. "But degree is equally fundamental and considerably less visible. How far the mana is bent. How tightly the flow is curved. The intensity of the structural deformation relative to the ambient field."
He drew two sigils side by side. They had opposing directional vectors. Their degree notations were different. "These two sigils," he said. "Opposite directions. You would look at them and see structural reverses of each other. And you would be correct about the direction component."
He paused. "But the degrees do not match. Sigil A bends to a depth of — using the Chapter Two notation — three increments. Sigil B bends in the opposite direction to a depth of seven increments." He looked at Nami. "If you apply Sigil B to a spell constructed with Sigil A, what happens?"
Nami was already in the middle-distance mode. She came back faster than usual, which meant the calculation had resolved quickly and the result had not been what she expected. "The directional components cancel," she said slowly. "But the degree differential—"
"Remains," he said. "Four increments of bend. Unresolved. Still present in the mana." He paused. "The mana is no longer shaped into Spell A. But it is not dispersed into stable flow either. It is shaped into something else. Something defined by the residual bend that the cancellation didn't address." He looked at the board. "The minus sign, in this case, does not produce zero. It produces a remainder."
The room was very quiet. "And the remainder," Robin said, with the careful voice of someone constructing the implication as she spoke it, "is mana that is still bent. Still structured. Still active." A pause. "But the structure it now has is not the structure of any spell in the Spellcrafting Formulas. It is not a spell anyone designed. It is—"
"A new effect," Arto said. "Produced by the incomplete cancellation of two spells whose directional components matched but whose degree components did not." He looked at the room. "An effect that nobody intended. That nobody has a formula for. That nobody has tested." He paused. "That is still operating in the mana field of whoever it was cast near."
Akeno was looking at the board with the expression she wore when something had revealed a depth she had not seen coming. "How unstable~" she said.
"Entirely dependent on the specific degree differential and the spell type," he said. "Which means unpredictably unstable. In a low-stakes situation you might get a harmless mana flare. In a high-stakes situation, with complex spells at high magnitude—" He stopped. "The remainder effect could be anything. There is no formula to predict it because it was not produced by a formula. It was produced by an error."
He let that sit. "This is why the existing sigil set cannot be used for Counterspell," he said. "The existing sigils were designed for construction. For bending mana into specific shapes with specific degrees optimized for specific effects. Every sigil in the current framework has a degree component that was chosen because it produces the right outcome for the spell it was designed for."
He looked at the board. "There is no reason — no reason at all — why the degree components of existing sigils would happen to be perfectly matched for cancellation across all possible spell pairings." A pause. "They weren't designed for that. They were designed for something else."
"So the new sigil set," Nami said. She was building the model now, the middle-distance quality present. "Designed specifically for degree-matched cancellation."
"Every sigil in the Counterspell architecture," he said, "will be designed with one criterion as the primary requirement — that when applied to a spell of the corresponding type, the degree components resolve to zero. Not approximately zero. Not close enough. Zero." He turned to the board. "Which means we cannot simply invert the existing sigils. We have to derive new ones from the ground up, starting from the degree requirement and working backward to the directional component."
He paused. "Which is why it requires a new set of formulas as well. The Spellcrafting Formulas are optimized for construction speed. The Counterspell formulas need to be optimized for degree precision first and speed second — because a fast Counterspell that leaves a degree remainder is more dangerous than no Counterspell at all."
Kiba raised his hand with the composed precision he brought to most things — not tentative, not aggressive, simply present. "Can we help?" he said. "With the Counterspell project." Koneko, beside him on the floor, looked at Arto with the same question in her expression without repeating it aloud, which was characteristic.
Arto looked at them both. He was quiet for a moment — not the quiet of someone formulating a diplomatic refusal but the genuine quiet of someone thinking through a question that deserved a real answer rather than a reflexive one. "No," he said.
Kiba nodded once, accepting this without protest, but with the quality of someone who wanted to understand the reasoning rather than simply receive the conclusion. "Not because you couldn't contribute," Arto said. "Because you are both doing something more valuable than contributing to a project that already has six people who have been living inside the Formulas long enough to have the working vocabulary for what we're building." He looked at Kiba. "Where are you in the Elric text."
"Chapter Fourteen," Kiba said. "The transmutation circle variations for organic compounds. It's — the intersection with the Formulas is becoming more visible the further I go. The equivalent exchange principle maps onto the mana conservation laws in Chapter Three in ways that I haven't fully worked out yet but can see the shape of."
"That shape," Arto said, "is more interesting to me than another person on the Counterspell project." He paused. "Equivalent exchange as Edward Elric formalized it and mana conservation as the Formulas define it are describing the same physical law from two different frameworks developed independently in two different worlds. The place where they converge is a place nobody has looked yet." He looked at Kiba steadily. "I cannot tell you what you will find there because I don't know. That is the correct kind of not knowing — the kind that means something is waiting to be found rather than the kind that means the ground is empty."
Kiba was quiet for a moment. "You want me to find it myself," he said. "I want you to find it," Arto said. "Whether it's by yourself or with assistance is logistics. The finding is the point." He paused. "When you find it, bring it to me. Whatever it is. Even if it looks small."
He turned to Koneko. She was looking at him with the particular focused attention she used when she was listening to something she intended to retain completely rather than approximately. "Senjutsu," he said.
She nodded. "You are training with Kuroka," he said. "And occasionally with me. The intersection between Senjutsu's nature energy framework and the Formulas' mana flow architecture is — I have some hypotheses. I have not shared them because I want to see where you arrive independently before I contaminate your approach with mine."
A pause. "Kuroka's method and my method are different. Training with both gives you access to two different frameworks for understanding the same energy system. That is not a distraction. That is the most efficient possible use of your current stage of development."
Koneko looked at him. "You're waiting to see what I come up with," she said. "I'm waiting to see what you come up with," he confirmed. A pause. "What if I don't come up with anything?" she said. Not self-deprecating — genuinely asking, the practical question of someone who wanted to understand the failure condition.
"Then you will have developed a more complete command of Senjutsu than you currently have," he said, "which is independently valuable and not contingent on producing a theoretical innovation." He paused. "But I don't think that's what happens. I think you will come up with something. I don't know what. That's the point."
Koneko absorbed this with the stillness she brought to things she was filing for careful later consideration. Kuroka, beside her, had been listening with the quality of attention she used when she was pretending to be less engaged than she was. She looked at Arto now with an expression that was somewhere between feline assessment and something more direct.
"And me," she said. "You are teaching your sister," he said. "Which means you are in the process of formalizing what you know well enough to transmit it, which is a different kind of understanding from simply knowing it. Teachers always learn more than students during the teaching." He paused. "Additionally, your command of Senjutsu is currently the ceiling Koneko is training toward. If you stop developing, the ceiling stops rising." He looked at her. "I have materials for you as well, when you're ready for them. But that's a separate conversation."
Kuroka looked at him for a moment. Then she settled back into her comfortable configuration with the expression of someone who had received more answer than they had asked for and was deciding what to do with the excess.
Arto looked at the room — at Kiba and Koneko, at the six women who had been living inside the Formulas long enough that their working vocabulary had shaped itself around the same framework he used, at the blackboard with its number axis and its blank space and its two words describing the problem that was now the room's problem collectively. "One more thing," he said. "For both of you."
Kiba and Koneko looked at him. "The certification test," he said. "The instructor certification. I want to be clear about what it is and what it is not." He paused, choosing the words with the precision he used when something mattered enough to be said exactly right rather than approximately right. "It is not a measure of your value to this family. It is not a threshold you need to cross to have my approval or my respect. It is a specific credential for a specific function — teaching systematic magic to people outside this room — and it is relevant to the six people who have taken it because that function is part of what they do."
He looked at them both. "What I want from you," he said, "is not certification. It is not mastery of the Formulas beyond what serves your own development. It is not fluency in whatever we build next." He paused. "What I want is for you to find the intersection between what we are building here and what you are building in your own fields, and to bring me something from that intersection that I did not anticipate."
He let that sit for a moment. "I have lived for three thousand years. I have more accumulated knowledge than any of you will have at your current ages, and I am not saying that to establish hierarchy but to acknowledge the obvious so we can move past it. The comparison is not useful. You are not three thousand years old. You have not had three thousand years. You have had the years you have had, and in those years you have developed things — ways of seeing, instincts, approaches — that I do not have."
He picked up the chalk. "Rias spent twenty years learning to be a devil lord's heir before she touched the Formulas. That twenty years is in how she approaches a problem. Akeno's heritage is in how she approaches power. Robin spent her entire life building a surveillance network before she walked into a room with this book."
He looked at Kiba. "You have Edward Elric's framework in your hands. That framework came from a world with different physical laws and a different relationship with transformation than anything in the Formulas." He looked at Koneko. "You have two teachers with different methods for the same energy system, which means you have access to the disagreement between them, which is where the most interesting questions live."
He set the chalk down. "I have six people working on what I expect," he said. "I need two people working on what I don't." The room was quiet. Kiba looked at the Fundamentals of Alchemical Transmutation on the side table where he had set it when Nami had come to fetch everyone, the worn spine of a book he had been inside for months.
Koneko looked at her hands in her lap with the expression of someone who had just been given a different kind of assignment than the one they had come into the room expecting and was adjusting to the new shape of it.
[Timeskip: Brought to you by chibi Arto waiting for Rias's article to be published....]
After the briefing, Arto led his six companions through the hidden entrance of Sector 0 and down into his personal domain within the Simulation Room.
[Simulation Room - Sector 2: Arto's Lab]
The space was vast yet intimate—sterile white walls lined with glowing blue runes, seven perfectly arranged workbenches forming a semi-circle around a central holographic projector. Each bench was equipped with tools, empty notebooks, and a small, hovering lens suspended above a crystalline base. A thin, steady string of white-blue light streamed from one side of each lens, representing a perfectly stable mana flow.
Arto stopped at the center and turned to face them.
"Welcome to the real starting line of Project Horizon. Time-dilation here is set to 1 minute outside = 60 hours inside. We will work one hour per day in real time. That gives us sixty hours of focused research every single day without burning ourselves out."
He gestured to the workbenches. "Each of you has your own station. On every bench you will see the special lens. That lens lets you see mana flows directly. The string of light is pure, stable mana. Put a sigil card in its path and you can observe exactly how the flow bends, compresses, or twists."
He opened a drawer on the nearest bench, revealing neatly organized sigil cards and a stack of blank ones. "These are the cards we already have from Spellcrafting Formulas. Use the blanks to design new ones. Your first task is to create 'straightening sigils'—sigils that can take a bent or distorted mana flow and return it cleanly to its original stable state."
Arto pointed to the large empty board on the far wall. "Every successful counter-sigil you create will be placed there. We will build the entire Counterspell library visibly, so we can see our progress and cross-reference."
He looked at the group—Rias, Akeno, Robin, Nami, Grayfia, Albedo. "Rias, Robin, and I will teach the rest of you how to approach this. Robin and I have studied every layer of the book more thoroughly than anyone. Rias has a natural talent for sigil work—she even wrote the article 'The Butterfly Effect in Spellcraft: Methodical Output Modulation through Micro-Adjustments to Foundational Sigils,' which is currently under review for Magic. She understands sigil structure at a level few can match. The four of you will learn from all three of us."
Rias flushed slightly at the praise but stood taller, clearly motivated. Arto continued. "We start simple. Observe how existing sigils bend the flow. Then design one that straightens it. Once we have reliable straightening sigils, we move on to building the actual Counterspell formulas—fast-casting versions that can be used in combat."
He clapped his hands once. "Take your stations. One hour real-time today. Let's begin."
[Timeskip: Brought to you by chibi Arto being caught by a tentacle made of light]
By the time the first session ended, the group stepped out of Sector 2 looking equal parts exhausted and exhilarated. The one real-world hour had felt like two and a half full days of intense work inside the time-dilated lab. Sweat dampened collars, eyes were slightly bloodshot from prolonged focus, yet the energy in the air was electric.
As they walked down the corridor toward the main exit of the Simulation Room, the conversation flowed naturally—half analysis, half wary excitement.
Rias wiped her forehead with the back of her hand. "That straightening sigil we prototyped… it actually worked on the third try. But the moment the flow collapsed cleanly, I realized how scary this is. If Spellcrafting Formulas lets someone create almost anything with enough imagination and visualization… Counterspell is its perfect shadow. It can erase almost anything."
Akeno nodded, lightning faintly crackling at her fingertips as she spoke. "Exactly. Normal magic is dangerous in the wrong hands because it can build whatever nightmare you can picture. Counterspell is dangerous on a completely different level. It negates magic through a natural dissolution process. No flashy explosions, no detectable mana spikes—just… gone. Any magical defense, any barrier, any construct could be unraveled before the caster even realizes what's happening."
Robin walked with her arms loosely crossed, one extra hand idly spinning a blank sigil card between her fingers. "Worse still—the seals. Ancient binding circles, prison realms, artifacts locked away for centuries… a well-crafted Counterspell could disperse them like they were never there. We're talking about potentially freeing things that should stay buried."
Nami let out a low whistle, still clutching a small stack of her own test notes. "So we're basically inventing the ultimate 'off' switch for magic itself. Great. If this leaks… every faction with a grudge or ambition is going to want it yesterday. And they won't care how many seals they break to get it."
Grayfia's voice was calm, but carried a rare note of gravity. "Precisely. This is not a tool for everyday combat. It is a strategic weapon that could destabilize the entire balance of power if mishandled."
Albedo's tails flicked once, her golden eyes narrowed in thought. "And that's why we keep it locked under Abyssgard Code, right? Same as the original Spellcrafting Formulas. The world isn't ready. Maybe it never will be."
Arto walked at the front of the group, listening to every word. When they reached the main transition area, he stopped and turned to face them all. "You're all seeing it clearly," he said quietly. "That's good. Because I noticed the same danger the moment we started designing the dissolution principles."
He gestured back toward Sector 2. "Spellcrafting Formulas is already extremely dangerous in the wrong hands. It turns imagination into reality through structured mana. Counterspell is its mirror image—it turns reality back into raw, harmless mana. No flashy counters, no detectable buildup. Just… dissolution. Natural. Silent. Undetectable until it's already too late."
His scarred face grew more serious. "Seals over ancient evils, containment fields on catastrophic artifacts, binding contracts older than most civilizations… a mature Counterspell system could unravel them like threads. That's not a side effect. That's the core capability."
He looked at each of them—Rias, Akeno, Robin, Nami, Grayfia, Albedo. "That's why everything we develop in Horizon stays under Abyssgard Code. The same classification as the original formulas. No leaks. No external sharing. No discussion outside this family until I say otherwise. The Underworld is not ready for this. It might never be."
After the group stepped out of Sector 2 and the heavy door sealed behind them, Arto suddenly stopped in the middle of the corridor. His hand reached behind his neck, fingers finding a thin chain no one had noticed before. With a quiet click, he pulled free a small, matte-black metallic cube no larger than a die. It pulsed once with faint blue light before going dormant in his palm.
He turned and held it out to Albedo. "Take this," he said, voice low and serious. "Keep it safe. Only give it back to me when I say the code phrase in my mother tongue—'I love you'—spoken in the exact tone I just used."
The entire group froze. Albedo's golden eyes widened as she carefully accepted the cube. Everyone else turned toward Arto, stunned. Rias blinked. "Wait… that was your mother tongue?" Akeno tilted her head, ears practically perked. "We've never heard you speak it before." Robin's extra hands paused mid-motion. Nami's mouth actually fell open for a second. Grayfia's usual composure cracked into visible surprise.
Arto gave a small, tired smile. "That sentence means 'I love you' in Abyssgard language—my home world's tongue. I won't teach any of you the language itself. I'll avoid using it as much as possible. It's the core of Abyssgard Code. Everything important I want to keep completely secret gets encoded in a scrambled version of that language. Outsiders can't crack it. Even if they somehow recorded it, without the exact tonal inflection and context, it's useless."
Albedo turned the small cube over in her fingers, studying it with intense focus. "What does this cube actually do, my Master?"
Arto's expression grew heavier. "It contains two critically important things. First: my complete personal knowledge of Counterspell—everything I did and thought about inside Sector 2 today is stored inside it. Second: a fighting style I designed specifically to defeat myself. All of it—techniques, counters, weak-point exploitation—is locked in there."
He tapped the side of his head. "I can talk about it right now because I still have roughly five minutes before the memory wipe fully takes effect. The cube will respond to me normally under everyday conditions. But in an emergency situation—if I ever become the danger, if something takes control of me or I lose myself again—it will only answer to two people."
His gaze moved between them. "Albedo. And Rias. You two are physically strong enough to fight me head-on and smart enough to actually use what's inside this cube to stop me."
Albedo's grip on the cube tightened slightly, her voice soft but resolute. "I understand." Arto reached into his pocket and pulled out a small, glowing key. He pressed it into Albedo's free hand."This is the master key to Sector 2. From now on, it's officially Albedo's Lab."
The holographic label above the sector door shimmered and changed: Sector 2 → ALBEDO'S LAB
Arto looked at her directly—blue flames steady in his eyes. "I trust you the most with this, Albedo. Not because of your power or your position as Baroness. But because it's in your very genes to be loyal to the one you choose. I'm placing something that could destroy me—and potentially a lot more—into your hands."
Albedo's golden eyes shimmered. She clutched both the cube and the key close to her chest. "I won't fail you." Arto exhaled slowly. His shoulders relaxed as the five-minute window visibly counted down in his mind. Then his eyes blinked once—slow, confused.
He looked around at the group standing in the corridor. "…Why are we all here in the Simulation Room?" he asked, genuinely puzzled. "Did I forget something?" The six women exchanged glances—some amused, some deeply moved, all understanding exactly what had just happened.
Rias stepped forward first, smiling gently. "You were just showing us something important, love. But it's okay. We've got it from here."
As Arto walked ahead toward the exit, still mildly confused about why everyone had gathered in the Simulation Room, the six women lingered behind in the corridor. Their eyes were locked on the small metallic cube resting in Albedo's palm.
Robin was the first to speak, voice low and decisive. "We need to talk about this. Now. Privately."
Albedo nodded once. Without another word, the group turned and slipped back into Sector 2—now officially Albedo's Lab. The heavy door sealed behind them with a soft, final click. Wards flared to life automatically, locking the space tighter than any vault in the Underworld.
Only when the last layer of privacy spells hummed into place did Albedo step forward and place the cube gently on the central table. The small device pulsed once with faint blue light, then went dormant again.
Albedo stared at it, then looked up at the others. "What happened that made him this careful about his own self?" she asked, voice tight with concern. "He spoke of the battle inside the Dark Arena like it was something that still haunts him. Grayfia and I weren't there. We don't know what that place is or what it did to him to push him this far with secret knowledge."
Grayfia's silver eyes were fixed on the cube as well, her usual composure laced with quiet worry. "I need to understand too," she said softly. "If this cube contains a way to stop him… then whatever created that need must have been truly terrifying."
Robin turned smoothly toward Akeno. "Akeno, you were there. Explain the whole thing to Albedo and Grayfia. From the beginning."
Akeno sighed—long and heavy—then leaned against the edge of the table, arms crossed. "Alright… Dark Arena is...."
[Timeskip: Brought to you by chibi Akeno explaining Dark Arena, their battle against it to chibi Grayfia and chibi Albedo]
She looked directly at Albedo and Grayfia. "Arto saw all of it. From inside his own body, trapped and forced to watch himself beat us down. He saw Robin's pain, Rias and me broken on the ground, Nami helpless. That night planted a deep fear in him. He is terrified of the living weapon he was made to become… and terrified that he still is that weapon, deep down."
Akeno's hands clenched at her sides. "That's why he's going this far. Counterspell isn't just a new tool. It's his insurance policy. If he ever loses control again—if the Arena or something worse wears his face and uses his knowledge—he wants us to have a way to stop him. Not to hurt him… but to save him. And to save everyone else from what he could become."
Albedo's fingers tightened around the small black cube until her knuckles turned white. Her golden eyes shimmered with a mixture of pain and fierce resolve. "So he built the weapon that could kill the monster he fears most… himself."
Grayfia's silver gaze was steady, but her voice carried a rare undercurrent of emotion. "He would rather give us the means to end him than risk hurting any of us again."
Akeno's voice faltered for a moment as she stared at the small metallic cube resting on the table. The lab's soft blue lighting cast long shadows across her face, making the faint tremble in her lips more noticeable. "There's… one thing about this cube that terrifies me more than anything else we've talked about tonight."
The other five women turned to her fully. Robin's extra hands stilled. Albedo's tails stopped moving. Grayfia's silver eyes sharpened with quiet concern. Akeno swallowed hard, then continued, her tone low and haunted. "I saw something exactly like this cube once before. Inside Arto's nightmare. The first night we all slept together on the sofa after watching movies… I wandered into his dreamscape by accident. I ended up trapped there for seven years—watching him grow up in that hell."
She reached out and lightly touched the edge of the cube with one finger, as if afraid it might burn her. "It was implanted on the back of his neck when he was only about ten years old. A small metallic device, same shape, same matte-black finish, same faint blue pulse when it activated. I don't know everything it did… but I know what I saw. Whenever he disobeyed an order, or whenever his 'Creator' wanted him unconscious for whatever reason, that thing electrocuted him. Full-body shocks. Painful enough to drop a grown man, let alone a child. I watched it happen three times before I couldn't take it anymore. And he had to endure that for two thousand years."
Akeno's eyes glistened, but she refused to let the tears fall. "It was one of the cruelest things I've ever witnessed. A ten-year-old boy, forced to fight for his life every single day, and when he wasn't perfect… they hit him with that thing until he blacked out. I was there as a ghost—powerless to stop it. I tried everything to reach him, to wake him up, but the Arena wouldn't let me interfere until the very end. Seven years of watching him grow up under that torture… and still, somehow, he came out of it gentle. Kind. Protective. He could have become a monster. Instead he became the man who saved all of us."
She looked up at the group, voice cracking slightly. "And now he hands us a cube that looks exactly like the one they used to control and hurt him as a child. He made it himself. To store the knowledge of Counterspell and a fighting style designed to defeat himself. I don't know why he chose this shape… but seeing it gives me chills down my spine. It feels like he's carrying a piece of his own torture with him, even now."
The lab fell into a heavy, pained silence. Albedo's golden eyes darkened with protective fury. Her fingers curled protectively around the cube, as if she could shield it from the memories it evoked. Grayfia's gloved hands tightened at her sides. Her voice was soft but laced with steel. "He trusts us with the very symbol of what once broke him… because he believes we would never use it to break him again."
Robin spoke quietly, almost to herself. "He turned his greatest pain into his greatest safeguard. Only Arto would do something like that." Rias stepped closer and gently placed a hand on Akeno's shoulder, offering silent comfort. Akeno leaned into the touch, drawing strength from it. Nami's usual sharp energy had softened into something quieter, more solemn.
"He really is the strongest of all of us… not because he never breaks, but because even after being broken thousands of times, he still chooses kindness."
Akeno wiped her eyes quickly and straightened. "That's why we protect this cube with everything we have. Not just for the secrets inside it… but for the man who trusted us enough to give us the one thing that once represented his worst suffering."