The winding dirt road back from Oshibana felt infinitely longer than the journey there. Inside the battered, state-issued magic four-wheeler, the silence of the night was broken only by the low, mechanical hum of the SE plug-in engine.
Gray and Erza took turns manning the steering wheel to conserve their magical stamina, while Natsu lay completely dead to the world across the back bench, his usual motion sickness entirely short-circuited by sheer physical exhaustion. Beside him, Lucy clung to the door handle for dear life, her shoulders slumped and her spirit thoroughly broken.
Every muscle in their bodies ached. Their clothes were a shredded testament to the battle at the railway station, caked in soot, dust, and dried sweat. The grueling hours spent fighting off Eisenwald's vanguard had been bad enough, but handing the dark mages over to the strict custody of the Rune Knights had required a mountain of paperwork, statements, and procedural red tape. By the time they were finally permitted to leave after helping clean up the demolished station lobby, the moon had already crossed the meridian.
"I… I honestly think my legs have turned to jelly," Lucy groaned, her voice muffled against the plush headrest. "No, worse than jelly. Liquid. I am liquid."
From the front passenger seat, Gray stretched his arms over his head, a loud pop echoing through the cabin. "Quit your whining, Lucy. We're passing the eastern boundary markers. We're practically home."
"Oh, easy for you to say!" Lucy shot back, sitting up with a sudden burst of indignant energy. "You didn't have to summon multiple celestial spirits just to keep from being sliced to ribbons! And let's not forget that you destroyed half of the grand terminal hall with those giant ice ramparts!"
Gray cleared his throat, suddenly finding the passing scenery very interesting. "Listen, technically speaking, that wasn't my fault. If you want to blame someone for the structural damage, look behind you. Natsu's fire blast is what blew the roof off."
"Don't put that on me!" Natsu suddenly barked, his eyes snapping open as he bolted upright, entirely defensive. "The bad guys were standing right under the roof!"
At the wheel, Erza didn't join in on the bickering. Her posture remained characteristically rigid, her hands gripping the leather steering wheel tightly. While her expression was calm, the slight, rhythmic twitch of her crimson eyebrow betrayed the storm brewing in her mind. Her thoughts weren't on the property damage or the legal logistics. They were fixed entirely on the shadow monk who had vanished into the night with a weapon of mass destruction.
Kai has the Lullaby.
As the vehicle sped past the jagged, ruined outskirts of Kunugi Station, the group fell silent. Through the cracked windows, the devastating aftermath of Kai's brief engagement with Erigor was on full display. Massive ancient trees lay snapped like toothpicks, deep craters scarred the earth where shadows had violently erupted, and the entire terrain looked as though it had been thoroughly tilled by a localized hurricane.
Gray let out a low, appreciative whistle, leaning closer to the glass. "Man… Kai really went to town out here. Look at those pressure cracks in the bedrock."
Lucy swallowed hard, a sudden chill running down her spine. "He...he's okay, right? I mean, he's arrogant enough to survive anything, but still..."
Erza didn't offer a reassuring reply. Her dark eyes remained locked on the dark road ahead. She wasn't sure either. Kairos Sunveil was an enigma wrapped in lazily worn bandages—brilliant enough to outwit the kingdom's finest scholars, yet reckless enough to treat a localized apocalypse like a minor inconvenience.
The magic vehicle crossed the final stone bridge, the familiar, warm glow of Magnolia finally rising to meet them through the early morning mist.
The massive timber doors of the Fairy Tail guildhall creaked open, and the seasoned team dragged their feet across the threshold. The moment they stepped into the main hall, the usual raucous shouting and clinking of ale mugs ground to a sudden halt. Dozens of eyes shifted toward the entrance, taking in the sight of the battered saviors.
"Man, look at them... they look completely wiped," Macao murmured, lowering his tankard.
Wakaba nodded, puffing on his pipe. "Must've been one hell of a job. Is Natsu sleepwalking? His eyes are literally rolling back."
Before the whispers could escalate into full-blown rumors, Mirajane sped over from behind the bar, her hands clasped in deep concern. "Oh my goodness, look at you all! You're completely covered in soot! Are you alright? Was the Eisenwald situation that severe?"
Erza raised a hand, cutting off the pleasantries before Mira could even offer them towels. "Mira. Did Kai return to the guildhall?"
Mira blinked, caught off guard by the sharp, intense gravity in Erza's voice. She slowly shook her head, her cheerful demeanor dipping into genuine worry. "No… Kai hasn't shown his face since yesterday afternoon. We assumed he was still out on the field supporting your team."
The collective atmosphere around Team Natsu instantly plummeted. Lucy's face drained of color, her hand flying to her mouth. "He's… he's still not back? Oh no. No, no, no."
"So the jerk didn't beat us here?" Natsu scratched the back of his pink hair, looking thoroughly confused. "I thought for sure he'd be sitting at the bar bragging about how he handled the boss."
Gray's jaw tightened as he crossed his arms. "That means he isn't hiding out in the storage room to avoid getting chewed out by Erza. If he's completely off the grid with that flute..."
Erza stood entirely motionless, her mind racing through the worst-case scenarios. If Kai hadn't returned to the guild to flaunt his success, and if the Magic Council hadn't issued an international crisis alert regarding the Lullaby, then where in Fiore was he? Had the death curse within the flute claimed him while his guard was down?
Sensing the rapidly rising panic suffocating the group, Mira stepped forward, placing a gentle, grounding hand on Erza's armored shoulder. "Hey, breathe. Look at me. Take a deep breath, Erza. Kai is incredibly slippery, we all know this. Go clean up, get some food, and rest. Master should be back from the regular Council conference any minute now. If Kai doesn't report in by then, Master will know how to track his signature."
Reluctantly, Erza let out a slow exhale, her shoulders dropping. "You're right. Panic will not yield tactical results. We must recover our strength."
The moment the tension broke, the team dissolved into various states of collapse. Lucy was the first to fall face-first onto the nearest long table, letting out a muffled groan of pure defeat. Natsu somehow managed to fall asleep while standing perfectly upright against a structural pillar, snoring softly. Gray dragged his feet toward the basement bathhouse to wash off the battlefield grime, while Erza moved toward the corner booths with a heavy, uncharacteristic slow step.
Hours bled into the early morning as the guild returned to its gentle, low-key rhythm.
Then, the main doors burst open with a loud, theatrical bang.
"HOH-HOHH! The master has returned!" Makarov Dreyar waddled into the hall, waving his hands joyfully as he greeted a few younger members who had been practicing card magic near the entrance. "Ah, there's nothing quite like the smell of home after a tedious Council meeting full of old men complaining about—"
The old man froze mid-sentence. Every single gaze in the tavern was currently locked onto him, before slowly shifting toward a corner table where four heavily bruised, bandaged, and utterly exhausted mages sat staring at him like vengeful spirits.
"Uh... what in the world happened to them?" Makarov muttered, sweat-dropping as he gestured toward the ragged Team Natsu.
Mira jogged over to the bar, wiping down a glass with a serious expression. "Master, we have a bit of a situation. The Eisenwald mission was a success, but... Kai stole the Lullaby. And he hasn't returned to the guild since."
Makarov dropped dead-weight onto the floor, his wooden sandals clicking loudly as his massive jester hat popped completely off his head.
"HE DID WHAT?!"
The entire guild watched in collective amusement as the old man twitched dramatically on the floorboards for a solid three seconds. Suddenly, he snapped back to his feet, literal steam erupting from his ears as his face turned a violent shade of crimson.
"That insufferable, stubborn brat! I thought that just once—just once—I could return from a regional conference without an active heart attack waiting for me at the front door! I'll wring his scrawny little shadow-weaving neck! I'll—"
Makarov paused. The explosive rage suddenly evaporated, replaced by a profound, heavy silence. He let out a long, weary sigh that seemed to age him an extra decade, dragging his feet over to a barstool and sitting down heavily.
"Ah... actually, what am I even yelling for? What else did I honestly expect from Kai?" Makarov rubbed his temples, his expression softening into something resembling fond exasperation. "The boy sees a forbidden magical construct, and his primal instincts take over. But don't lose your heads. He wouldn't do anything truly reckless. Not with an artifact of that caliber."
Erza leaned forward, her voice sharp with disbelief. "Master, with all due respect, it is not merely an artifact. It is a living, cursed tool of the Black Wizard Zeref. It carries a mass-death spell."
"Yes, I am well aware," Makarov replied calmly, taking a slow sip of the tea Mira handed him. "Which is precisely why he is the absolute best person in this entire province to handle it. You all tend to forget because he spends half his time napping in the rafters, but Kai is one of the crown's officially appointed magical research experts. The boy was granted a specialized high-clearance research seat because his entire magical foundation revolves around the analysis, containment, and deconstruction of highly volatile, unstable dark artifacts."
Lucy's jaw dropped so low it nearly hit the table. "H-He has a legitimate government job?! Him?!"
Makarov let out a hearty laugh. "Indeed he does, my dear. A very specialized, very lucrative one. Though he certainly doesn't dress the part."
"He still behaves like an absolute slacker," Gray muttered, walking up from the bathhouse with a towel draped around his neck. "But if he's doing research, what are we supposed to do in the meantime?"
"We wait," Makarov said firmly, his eyes crinkling with absolute trust. "He'll come back when the work is done."
Two hours later, the gloomy atmosphere of the guildhall had thoroughly dissolved. The mid-day sun was shining brightly through the stained-glass windows, and the classic Fairy Tail chaos had returned in full swing. Members were laughing, throwing punches, and good-naturedly teasing Team Natsu about their rough weekend. Even Natsu had fully recharged his internal battery, aggressively hopping from foot to foot in front of Erza.
"Come on, Erza! You promised we'd have our duel the second we got back to Magnolia!" Natsu roared, fire licking at his lips. "Let's go right now!"
"The duel will have to wait, Natsu," Erza repeated for the fifth time, polishing her gauntlet with a stern look. "Kai must answer for his insubordination the moment he steps through that door. He owes this entire team a massive explanation."
Gray leaned back against a pillar, smirking. "Honestly, if the guy doesn't show up in the next ten minutes, I'm going to track his magical trace myself. I want to see what kind of crazy laboratory setup he's running."
Happy fluttered past them, happily chewing on a raw fish. "Maybe he just fell asleep in a ditch somewhere! Aye!"
And then, right out of the empty air directly beside their table, a smooth, drawling voice echoed:
"Well, what is it, my absolute cuties? I'm already here."
The entire table practically exploded in fright.
Natsu fell completely backward over his chair, his legs flailing in the air. Gray choked violently on his drink, spraying a mist of water across the table, while Lucy let out a high-pitched squeal and slid entirely off the bench onto the floor.
Erza turned around with mechanical, terrifying slowness.
Kairos Sunveil was leaning casually against the edge of their table, stretching his arms with a lazy yawn. His dark hair was a messy, windblown disaster, and fresh, crisp medical bandages were peeking out from beneath the collar of his tattered black cloak. He was sporting that signature, infuriatingly smug smirk.
"Well? Why is everyone staring at me like I'm a vengeful spirit? Hey, Red, seriously, what is with that look? I know I'm exceptionally easy on the eyes, but—whoa—wait—"
He didn't get to finish the thought.
SHING!!
With a blinding flash of light, Erza re-equipped a gleaming steel broadsword mid-stride and lunged forward with a lethal horizontal slash.
Kai yelped, his eyes widening as he dropped into a low, fluid roll beneath the trajectory of the blade. "WHOA—HEY—TIME OUT! STOP THE MADNESS!!"
But Erza's wrath was entirely locked in. Before her first sword even completed its arc, a second blade materialized in her left hand, and she brought it down in a brutal, vertical cleave meant to pin him to the floorboards.
Kai sprang backward with supernatural agility, flipping onto the surface of an adjacent dining table.
Erza didn't hesitate, her voice booming across the hall: "NATSU! GRAY! LUCY! LOCK DOWN HIS EXITS!"
Gray clapped his palms together, his magical circle flaring ice-blue. "Ice-Make: WALL!!"
A massive, thick rectangular barrier of solid ice erupted from the floorboards directly behind Kai, perfectly cutting off his retreat and forming an impromptu cage.
"Oh, come on! Seriously?!" Kai groaned, throwing his hands up. "Is this how we do reunions now?!"
From the flank, Natsu charged in like a loose missile, his fist fully engulfed in roaring, golden-orange flames. "You're wide open, Kai!"
The moment Natsu reached him, Kai's analytical gaze shifted into high gear. With a micro-movement, he slapped Natsu's flaming wrist aside, breaking his momentum, grabbed the dragon slayer's sleeve, and spun him effortlessly around like a top, redirecting his forward velocity straight toward the oncoming Erza.
"RETURN TO SENDER!" Kai yelled.
Erza was forced to sidestep sharply to avoid a head-on collision with a screaming Natsu, her expression turning thoroughly homicidal. "You slippery little snake!"
From the left, Lucy swung her leather whip, the crack of the leather echoing through the room as Happy flew in circles near the ceiling, shouting, "Get him! Catch the thief! Aye!"
Kai didn't even blink. He tracked the trajectory of the whip, caught the leather cord cleanly in his palm, and gave it a sharp, calculated yank. The force pulled a shrieking Lucy forward, sending her tumbling directly into Gray's chest just as the ice mage was preparing another spell.
Taking advantage of the sudden collateral chaos, Kai flipped cleanly off the top of Gray's ice wall, grabbed a decorative wooden support beam mid-air, swung his body upward, and launched his specialized cloth wrappings toward the high rafters of the roof. With a sharp pull, he hoisted himself completely out of the melee range.
A second later, he was hanging perfectly upside down from the central roof beam, his foot wraps securely anchored around the timber, looking down at the wreckage below.
"NOW THEN!" Kai called out, crossing his arms while hanging inverted. "WHAT is the deal with this super warm welcome?!"
The main hall was in absolute shambles within a matter of seconds. Tables were flipped, chairs were splintered into kindling, and a thick cloud of dust floated through the air. Kai looked down at the furious redhead with a look of wary, amused tolerance—the exact look of a man who knew he deserved a bit of a beating, but was going to make them work for it anyway.
Erza pointed her longsword directly at the ceiling, her voice vibrating with a cold, terrifying authority. "Get. Down. Here. Now."
Kai blinked, his eyes darting left and right toward the open windows to calculate escape vectors. "…Is this whole assassination attempt about the creepy flute? Look, nothing bad happened! Just hear me out for two seconds! I only took it to run a comprehensive structural analysis—"
"I SAID DOWN!"
Her final shout was laced with enough magical pressure to make the heavy floorboards visibly tremble.
Seeing that diplomatic avenues were thoroughly closed, Kai let out a defeated sigh. "Yeah… figured as much. No one ever wants to talk it out."
Erza's entire body erupted in a blinding flash of re-quip magic. When the light cleared, she was donning her legendary Heaven's Wheel Armor. A massive, shimmering halo of countless silver swords materialized in a perfect orbit around her as her metallic wings gleamed under the chandeliers. With a powerful leap, she rocketed straight toward the ceiling, a storm of blades trailing in her wake.
Kai's left eye twitched. "Oh, great. The flying sword storm. Here we go again…"
Just a microsecond before the silver blades shredded the timber beam, Kai's body dissolved into fluid darkness, sinking instantly into a pool of shadow on top of the log. Erza's swords slammed into the wood instead, exploding the heavy beam into a shower of splinters and sawdust.
"Coward! Show yourself!" Erza growled, hovering in mid-air as her sharp eyes scanned the dark recesses of the ceiling grid.
A sudden flicker in the shadow of a nearby support joist caught her attention. Reacting on pure instinct, she spun around, summoning a massive iron war-hammer to crush the shadow before he could manifest. But just as she swung, a small, cylindrical object was kicked out from the darkness.
—FLASH!!!
A military-grade Aethertech stun grenade detonated with a deafening crack of concentrated light and localized sonic pressure.
"Guh!" Erza hissed, her eyelids snapping shut as the blinding flash completely overwhelmed her vision, her hammer swinging wide into empty air.
Before she could recover her bearings, Kai dropped out of the overhead shadows, flipped cleanly in mid-air, caught her by the ankles, and—with perfect leverage and zero ceremony—hurled her straight back down toward the floorboards.
"Sorry, Red! You're the one who escalates every conversation into a war zone!" Kai shouted as he descended.
Erza would have suffered a rough impact, but a smooth, pristine ramp of solid ice suddenly materialized beneath her falling form.
Gray skidded into position below, one hand pressed firmly against the ground. "Ice-Make: Slide!"
Erza touched down on the frozen incline, channeling her momentum into a graceful slide before spinning back into a defensive stance. But when she snapped her eyes open, Kai had already vanished from the air.
"Where did he go?!" she demanded.
Before anyone could track his presence, Natsu spun around on his heel, alerted by Happy's high-pitched warning scream from above: "NATSU, HE'S RIGHT BEHIND YOU!"
The shadow monk had materialized directly within Natsu's blind spot, his expression completely tranquil. Natsu reacted on raw, feral instinct, throwing a blind backward kick infused with a violent burst of dragon fire. Kai sidestepped the flaming heel by a mere inch, caught Natsu's ankle to anchor him, smiled faintly, and drove his elbow straight into the dragon slayer's jaw.
"Echo Strike!"
A sharp, resonant crack echoed through the entire tavern. Natsu was sent stumbling backward from the physical force of the blow, but as he tried to plant his feet and retaliate, a secondary, localized shockwave of stored kinetic energy rippled outward from his jawline, knocking him entirely off his feet.
"Gah—! You cheap... trickster...!" Natsu sputtered, shaking his head to clear the ringing.
By the time Natsu hit the floor, Kai was already gone, melting back into the ambient shadows of the room.
Erza sensed a sudden displacement of air behind her. Without turning, she summoned a heavy iron mallet and smashed it directly into the floorboards where the shadow was pooling. The wood exploded into a crater of flying splinters—the sheer concussive force forcing Kai out of his shadow-meld state like a cork popping out of a pressurized bottle. He stumbled, his balance compromised for a fraction of a second.
It was all the opening Erza needed. Rocketing forward, her armored gauntlet flashed in a blinding straight right punch. Kai barely managed to cross his bandaged forearms to form an impromptu guard, but the sheer, monstrous physical strength behind Erza's blow hit him like a charging beast, sending him flying clean across the length of the guildhall.
His boots carved deep, smoking grooves into the hardwood floor before he finally slid to a halt.
"Ow. Okay, that one actually hurt," Kai muttered, shaking out his numb wrists. "Yep, definitely should have stayed in bed today."
"Take this!" A massive, roaring fireball came flying straight at his face as Natsu bolted back into the fray, followed immediately by Gray, who launched a rapid-fire barrage of jagged ice constructs rising dynamically from the floorboards.
The ice constructs slammed straight into Kai's chest, throwing him back into the air. Mid-flight, a small, intricate golden magic circle manifested directly beneath his back, instantly decelerating his velocity to a gentle drift.
"Shadow Monk Arts: Feather Fall."
Kai groaned softly, leaping backward to land squarely on top of an empty corner table, his dark cloak fluttering around him like smoke as he hunched over, thoroughly exhausted. "Can't we put a pin in the execution?! I'm still actively recovering from internal injuries here, you maniacs!"
But his complaints fell on completely deaf ears. Gray froze the entire table solid to lock his feet in place, Natsu charged from the front with both fists engulfed in an inferno, and Erza soared overhead, bringing her twin swords down for a final, decisive strike.
Kai let out a sharp, irritated breath. "Alright. Fine. Class is in session."
A brilliant, intricate golden magic circle materialized directly above his head like a blinding halo. The medical bandages wrapped around his arms violently uncoiled themselves, swirling upward into the air before rotating around his body at supersonic speeds, forming an impenetrable, glowing dome of pressurized energy and rotating woven fabric.
"Shadow Monk Arts: Vishnu's Embrace!"
The trio's combined assault slammed into the protective dome simultaneously. Gray's ice shattered into fine powder, Natsu's flames were violently dispersed into harmless sparks, and Erza's twin swords deflected off the kinetic barrier with a deafening metallic screech. A massive, concussive shockwave exploded outward from the dome, sending Erza, Natsu, and Gray skidding backward across the room in one clean sweep.
As the protective circle faded, Kai stood at the center of the table. His gaze was remarkably sharp, his posture low and coiled, and a faint, shimmering heat distortion radiated from his skin. He took one deep, focused breath, dropping into a classic martial arts stance.
"Shadow Monk Arts: Body Strengthening."
His foot slammed into the wooden tabletop, and the sheer force of the impact shook the entire foundations of the building. The shockwave was powerful enough to lose the footing of several onlookers; Mira, Cana, Macao, and Lucy all stumbled back in pure shock. In a literal blink of an eye, Kai vanished from the table. The air exploded with a loud sonic crack as he materialized directly inside Erza's guard—his fist already moving in a precise, lightning-fast strike aimed directly for her breastplate.
But before the blow could connect—
"ENOUGH OF THIS NONSENSE!!"
A colossal, terrifying shadow loomed over the entire battlefield.
Master Makarov's Titan Fist came crashing down from the ceiling like a falling mountain, flattening Kai, Erza, Natsu, and Gray into the splintered floorboards with one singular, earth-shattering swing.
The entire guildhall rocked violently on its axis. Several dozen priceless liquor mugs rattled off the shelves, shattering on the floor. A heavy, absolute silence gripped the room, broken only by the settling dust.
From beneath the massive, wrinkled fist, four distinct, miserable groans echoed in perfect unison.
"Guh... Master... that's structural abuse..."
"Not the face... again..."
"Why does he always aim... for my spine..."
"Can I just... sleep down here... permanently...?"
Makarov let out a heavy huff, his giant hand shrinking back to its normal, withered size as he glared down at the four of them with an expression that could have cracked granite.
"ARE YOU IDIOTS MUTUALLY BENT ON DESTROYING MY GUILDHALL BEFORE THE WEEKEND?!"
Kai peeled his face off the broken floorboards, casually dusting off the splinters and debris. Despite the fresh bruises forming on his arms, he looked entirely unbothered, rolling his shoulders until a series of loud pops echoed from his spine. "Chill out, old man. We were just running a live-combat diagnostic. No harm done. Mostly. Sorry about the floor—I'll run the structural repairs later."
Makarov's eyebrow twitched violently at the word 'later.' "I DON'T WANT TO HEAR A SINGLE WORD ABOUT 'LATER,' KAI! And don't you dare try to pass this off as a game—this entire catastrophic mess is your fault! You especially! Stealing a highly classified dark artifact and actively deceiving your own guildmates!"
Kai raised both hands in the air, a relaxed grin on his face. "Whoa, harsh accusations. Technically speaking, I never uttered a single falsehood. The semantics are very important here."
Erza, Natsu, and Gray had managed to drag themselves into a neat line, bowing their heads in a formal apology to the Master.
Makarov sighed heavily, pinching the bridge of his nose to stave off a mounting migraine. "I told you hotheads to stand down before you started swinging. Kai took the Lullaby, yes—but that was entirely within his operational mandate. The boy is a licensed researcher; dealing with highly unstable, cursed magic cores is quite literally his state-issued job description. The least you could do is let the boy explain his findings before you start demolishing my real estate!"
The angry trio froze, the fiery indignation instantly draining from their faces, replaced by a sudden wave of awkward guilt.
Kai popped his neck, letting out a quiet chuckle as he leaned against a surviving stool. "Much appreciated, Master. These guys really need to invest some points into their patience attributes. Their threat assessment skills are severely lacking."
Every head in the room snapped toward him with absolute venom. Including Makarov's.
"And you need to invest points into basic restraint, you insufferable brat!" Makarov barked.
"Fair point," Kai said with an easy shrug. "Alright, look, here's the actual field report."
He reached into his inner cloak pocket, pulling out a thick, tightly folded blueprint covered in complex mathematical formulas, runic matrix designs, and messy handwritten notes.
"I managed to secure the artifact from that shadow-mage guy—Kageyama—right after I knocked him unconscious. I took a quick look at the external runic sealing and realized the curse container was undergoing rapid structural decay. If I left it with the vanguard or the local authorities, it was going to trigger a localized catastrophe within forty-eight hours. So, I checked it into my personal containment inventory to perform an emergency deconstruction."
Erza crossed her arms, her gaze remaining incredibly stern. "That does not excuse the fact that you deliberately misled us, Kai. I explicitly commanded you not to lay a finger on that entity."
Kai met her sharp gaze with absolute composure. "Like I said, I didn't mislead anyone. When you guys arrived, did you ask me if I had the flute? No. You didn't. You just listened to what Blondie here blurted out—"
"My name is Lucy!" she screamed from the floor.
"—and then you rushed off to play heroes. You asked me which direction the remaining dark mages went, and I gave you the precise coordinates. I fulfilled my operational duty. As for your command, Erza... you told me not to touch it, and I clearly responded that I would think about it later. I then spent three seconds processing your advice, weighed it against the impending magical meltdown, and decided to completely disregard it for the sake of public safety."
Erza's face turned a spectacular shade of crimson. "Y–YOU—!"
"Wait a minute, why didn't you just tell us you had it then?!" Gray demanded, stepping forward. "We ended up fighting through an entire vanguard brigade because we thought the main threat was still loose on the tracks!"
Lucy added, her lower lip trembling with pure frustration, "Yeah! I literally risked my life fighting Kageyama in the train car because I thought it was my fault he had escaped with the weapon!"
Kai blinked at them, his face dropping into a perfectly flat, deadpan expression. "Uh, that's called an organic narrative arc, Blondie. It builds character."
"IT'S LUCY!!!"
He waved his hand dismissively. "Besides, if I had told you the flute was already secure, you guys wouldn't have gone after the rest of Eisenwald with that level of terrifying motivation, right? Those dark mages still needed to be neutralized before they could cause real harm down the line. I simply... managed the core threat while you guys handled the field cleanup. You were never in any actual danger. I mean, I personally fractured Erigor's spine into three neat pieces, so..."
He chuckled softly to himself, tapping his chin. "I suppose you could say I left the dark guild completely toothless. Like a harmless little snake. No, wait... a worm. Yes, a localized earthworm. Much better poetic imagery."
Absolutely nobody laughed.
Kai let out a theatrical sigh, shaking his head. "Man, tough crowd today. You guys really need to work on your sense of humor. You all look incredibly constipated."
Makarov let out a long, exhausted breath, rubbing his eyelids. "Kai. Let's cut to the core of the issue. Where exactly is the Lullaby right now? Regardless of your research status, the Magic Council is going to demand the artifact be returned to the state vaults for permanent containment."
Kai suddenly developed a fascinating interest in the ceiling, his eyes glancing away as he began to whistle a casual tune. "Well... about that specific request..."
The entire guildhall fell completely dead silent once more.
"What do you mean, about that?" Erza asked, her voice dropping into a dangerous, low register.
"Well, to put it in layman's terms, the original artifact... technically no longer exists within this physical plane," Kai said, his tone as light as if he were discussing the afternoon weather forecast. "During the deconstruction process, the internal curse matrix went entirely critical. The entity tried to manifest its true form—some giant, multi-eyed wooden demon hell-bent on consuming souls. So... I systematically dismantled it. The original flute shattered cleanly in half. But don't worry, I didn't let the raw materials go to waste. I'm a recycler at heart."
He reached back into his pouch, pulling out a sleek, polished musical instrument.
It was a flute—but it bore absolutely no resemblance to the grotesque, three-eyed relic of Zeref. This instrument was beautifully carved from a pale, pristine black wood, its surface smooth, elegant, and intricately engraved with faint, glowing golden runes that hummed with stable energy.
The entire team tensed on instinct, Natsu's fists sparking with flame as they prepared for an immediate dark magic surge.
Kai merely offered a reassuring smile. "Relax, everyone. The curse has been thoroughly scrubbed. It's completely harmless now. Actually... it's a bit more than harmless. Allow me to demonstrate."
He lifted the pristine white wood to his lips, closing his eyes, and played a single, long note.
The sound that echoed through the broken guildhall wasn't the heavy, soul-crushing drone of a death curse. It was soft. Warm. Impossibly beautiful.
A gentle, cooling breeze rolled through the tavern, carrying the scent of fresh pine and spring rain. The moment the melody washed over them, the deep-seated tension in Team Natsu's muscles instantly vanished. The heavy black bruises lining Natsu's arms began to shimmer with a faint, golden light, the swelling visibly reducing within seconds. Lucy blinked in sheer astonishment, feeling a sudden, profound lightness wash over her entire body as her lingering fatigue completely evaporated.
Kai lowered the flute from his lips, a triumphant, cocky smirk gracing his features. "I completely inverted the runic formula and re-wired the ethernano core structure. I spent the entire night systematically purging the demonic consciousness with concentrated, high-density light ethernano. It took a massive amount of precision work, but the results speak for themselves. The artifact has been repurposed. It now generates a high-frequency restorative melody that soothes the nervous system and accelerates cellular healing. Though, since it doesn't have a sentient demon constantly generating its own fuel anymore, it relies entirely on the caster's personal magical reserves."
The entire guild stared at the gleaming white instrument in absolute, stunned silence.
Erza's broadsword slipped from her fingers, clattering loudly against the floorboards.
Gray stared blankly, his voice a hollow whisper. "You... you literally took a forbidden tool of mass murder and weaponized it into a high-tier healing device."
"Nailed it," Kai said proudly, tossing the flute lightly in the air before catching it cleanly. "Aethertech engineering at its absolute finest. Honestly, you guys should have seen the specialized containment array I used to shatter the demon's core. I actually used that high-density silver spear I borrowed from your armory, Red. Excellent structural integrity, by the way. My thanks."
Erza's eyebrows knit together as a dangerous tick returned to her forehead. "You didn't borrow it. You explicitly stole it from my personal re-quip dimension while I was distracted!"
Makarov let out a long, deep sigh—half filled with absolute operational frustration, and half filled with a deep, reluctant admiration for the boy's terrifying level of genius. "That brat is going to give me grey hairs that not even advanced transformation magic can cover up..."
Kai merely grinned wider, slinging his arms behind his head as he leaned back. "Come on, old man, look at the big picture! Admit it—it's an absolute masterpiece of engineering, right?"
And though no one in the room dared to say it out loud, not even Erza could find the words to deny it. Because somehow, through all his infuriating arrogance, laziness, and blatant disregard for the rules, Kairos Sunveil had taken an instrument of pure despair and turned it into something gentle.