Fate's Slave - Shadow Slave X Honkai Star Rail

Sunny flowed soundlessly within Yanqing’s shadow, his presence reduced to something that barely qualified as existence, and yet his mind remained as active as ever, turning over observations with a relentless precision that bordered on obsession. The deeper he sank into that strange half-state between matter and absence, the more acutely he became aware of the differences between himself and the young swordsman he trailed, because although both of them borrowed from others in combat, the method and philosophy behind it could not have been more different.

Sunny’s Shadow Dance was, at its core, an act of interpretation.

It was theft, refinement, and reinvention all at once.

He observed, he understood, and then he changed.

Every movement he copied became something slightly different by the time it settled into his body, shaped by his own instincts, his own limitations, and his own preferences, until it no longer truly belonged to the original wielder. What emerged was not a replica, but an evolution, a synthesis of strengths stripped from countless opponents and reforged into something uniquely his own.

Yanqing did not do that.

Yanqing did not reinterpret.

Yanqing did not refine.

Yanqing simply... copied. Without deviation.

Sunny’s awareness lingered on the memory of their previous clash, his thoughts sharpening as he dissected every detail he could recall, because the more he analyzed it, the more unsettling it became. Yanqing’s abilities were not merely talent or skill in the conventional sense; they were something far more structured, something that followed a pattern that Sunny could almost map out if he focused hard enough.

His Dormant Ability.

The ability to analyze a weapon, to understand not just its form but the intent behind its use, and perhaps even the history embedded within it. That latter aspect clearly brushed against the domain of divination, considering the limitations he had observed, but the former was undeniable. Yanqing had been able to replicate Mongrel’s techniques without hesitation, even when he could not identify who Mongrel truly was.

Then, there was his Awakened Ability.

The capacity to replicate weapons themselves, whether by instantaneous copying or by recording them for later use, allowing Yanqing to draw upon an arsenal that was not physically present. It explained the variety he had displayed in combat, the ease with which he transitioned between styles that should have required years of dedicated practice.

Lastly, was his Ascended Ability.

Weapons that moved without being held, blades that responded to will alone, forming a storm of steel that turned the battlefield into something closer to a controlled execution than a fight. It gave context to his preference for multiple weapons, to the way he constructed his offense around overwhelming presence rather than singular focus.

And yet...

None of that explained everything.

Sunny’s thoughts darkened slightly as his mind returned to the most disturbing detail of all.

The eye.

The moment when Yanqing had torn it out without hesitation, when a steel lotus had bloomed from the empty socket, and when his Soul Essence had surged to a level that defied logic. That had not been mere skill or ability; that had been something else entirely, something that carried the unmistakable imprint of two opposing forces colliding within a single existence.

The Hunt.

And the Abundance.

Sunny frowned within the shadow, the expression invisible but no less real.

Those Paths did not coexist. They could not coexist.

They were fundamentally opposed, conceptually incompatible, and within the Xianzhou Luofu, the mere association with the Abundance was enough to warrant condemnation. It was the enemy, the curse that had shaped their entire civilization, and yet Yanqing wielded it without consequence.

Or rather...

Without visible consequence.

’And he’s even Jing Yuan’s inheritor...’

That alone spoke volumes.

As Yanqing moved through the streets, Sunny’s attention shifted outward, taking in the subtle reactions of those around them. The glances were not overt, not enough to draw attention in a crowded environment, but they were there — brief flashes of disdain, wariness, and quiet hostility that followed the young swordsman like a shadow of their own.

It was not surprising.

Even without obvious signs of regeneration, even without the grotesque markers typically associated with the Abundance, the mere suspicion was enough. The people of the Luofu had long memories, and their hatred ran deep, ingrained into the very fabric of their culture.

Yanqing noticed.

Of course he noticed.

His posture remained composed, his expression unchanged, yet there was a subtle tension in the way he moved, a readiness that suggested he was prepared for confrontation at any moment. It was not fear, not quite, but rather a quiet acknowledgment of the reality he existed within.

Sunny watched.

Time passed.

And passed.

And passed.

The sun dipped lower, the golden glow of the Sanctum gradually giving way to the softer illumination of lanterns as night settled over the Luofu, yet Yanqing did not stop. He did not return to any obvious destination, nor did he engage in any activity that resembled duty or training, which struck Sunny as increasingly odd the longer it continued.

Sunny wondered, a faint trace of incredulity slipping into his thoughts.

’Doesn’t he have responsibilities? Or training? He’s a Master under Jing Yuan, not some idle tourist.’

The question lingered unanswered.

Until, without warning, Yanqing stepped off the edge of the platform.

There was no hesitation.

One moment he was walking, and the next he was falling, his figure dropping into the vast artificial sea below as though gravity itself had claimed him without resistance.

Sunny did not react immediately.

Not because he could not, but because the nature of his current state rendered the concept of reaction... different.

The world shifted.

Or perhaps, it expanded.

The shadow he inhabited was still Yanqing’s, still anchored to his form, yet the surrounding darkness transformed into something far more complex. What had once been a flat plane now possessed depth, layers folding into one another as the absence of light within the water created a vast, three-dimensional expanse of shadow.

It was disorienting.

Fascinating.

And entirely logical once he processed it.

’The ocean blocks light. Which means... shadows exist within it.’

He was within Yanqing’s shadow.

Yanqing’s shadow was within the sea’s shadow.

And the sea’s shadow was... immense.

From his perspective, Yanqing was no longer falling.

He balanced effortlessly atop a summoned sword, gliding across the surface of the water with a grace that bordered on absurd, his descent transitioning seamlessly into forward motion as though it had been planned from the start.

Sunny followed.

Because of course he did.

The journey did not last long, though time felt strangely distorted within the layered shadows. Eventually, Yanqing reached a destination — a small stone island rising from the artificial sea, its surface jagged and uneven, marked by countless scars that spoke of repeated violence.

Scars formed by swords.

At the center of the island stood a figure.

Sunny froze.

Even within the fluidity of shadow, even within the constant motion of his awareness, something in him stilled as his attention locked onto her.

She was... beautiful. 𝓯𝙧𝙚𝒆𝙬𝙚𝒃𝙣𝙤𝒗𝓮𝓵.𝙘𝙤𝙢

There was no other word that fit, though it felt insufficient in its simplicity. Long, icy blue hair cascaded down her back, moving gently despite the stillness of the air, while a blindfold adorned with a subtle moon motif concealed her eyes. In her hand, she held a sword formed of pure ice, its structure unmistakable to Sunny’s perception.

A Memory. A Transcendent one.

The Spellweave that held it together was intricate, refined to a degree that spoke of something far beyond ordinary craftsmanship.

’A Legacy Relic.’

Her presence was that of a Saint, because of course it was.

Before he could analyze further, she moved.

There was no warning.

No buildup.

No visible transition between stillness and action.

One moment she stood at the center of the island, and the next she was in front of Yanqing, her blade already in motion as it carved through the air with lethal precision.

Yanqing reacted instantly.

Steel met ice in a flurry of motion, the clash ringing out across the island as he parried the strike and immediately transitioned into a counter, only to be met with another attack that forced him back. The exchange escalated rapidly, the pace increasing to a level that would have been incomprehensible to anyone lacking the ability to perceive it.

Sunny watched everything.

Every movement.

Every shift in weight.

Every angle of attack.

Yanqing was good.

Incredibly good.

But it did not matter.

He was overwhelmed.

Not because he lacked skill, but because the gap between them was too vast, the difference in their existence too great to bridge through technique alone. His copied weapons shattered under the force of her strikes, each replica failing to withstand the sheer refinement of her blade, forcing him to create more in rapid succession.

Yet even then, he did not resort to his usual tactics.

No storm of blades filled the sky.

No overwhelming barrage descended upon her.

It was just swordsmanship.

And as Sunny observed, something strange caught his attention.

Yanqing’s shadow. It moved differently.

Not erratically, not unnaturally, but... intentionally.

Because Sunny was within it.

And as Yanqing fought, Sunny’s instincts took over, his shadow extending outward, reaching for the woman’s shadow, attempting to merge with it in order to understand her movements in the only way he truly could.

And then—

He realized something.

She was not doing anything special. There were no complex techniques. No hidden mechanics. No layered strategies. Her movements were simple.

Fundamental.

Each swing, each thrust, each parry adhered perfectly to the most foundational principles of swordsmanship, executed with a level of precision that bordered on the absolute. There was no wasted motion, no unnecessary flourish, no deviation from what was optimal in any given moment.

She was perfect.

And because of that, there was nothing for Sunny to change.

His shadow copied her movements exactly.

For the first time, his Shadow Dance had nothing to add.

Yanqing, on the other hand, struggled.

Not because he could not replicate her techniques, but because he tried to do more than that. His movements became cluttered, layered with influences from other styles as he attempted to supplement what he saw with what he already knew, creating a dissonance that disrupted the purity of the form.

Eventually, the outcome became inevitable.

Her blade pressed against his neck.

The fight ended.

Yanqing exhaled, conceding without protest as the icy weapon withdrew, dissolving into mist as she stepped back with a faint, almost amused expression. She spoke, her voice calm yet carrying a subtle edge.

"That was adorable, my dear student. Did you truly believe that attempting to emulate countless styles simultaneously would allow you to keep pace with me?"

Sunny noted that. He had already seen it.

Yanqing was not simply copying.

He was... blending.

Poorly, at that.

She continued, her tone shifting ever so slightly.

"Your talent lies in replication without external interference. Whoever convinced you that fusing multiple schools was advisable is either a fool, or possesses something uniquely suited to that approach."

Yanqing looked embarrassed, his usual composure slipping just enough to make it noticeable.

"Right, sorry, Miss Jingliu."

She sighed.

"Did I not tell you to call me Master? Or Mistress?"

Sunny narrowed his eyes within the shadow.

There was something... off about that. A bit lecherous, even.

Yanqing, however, seemed entirely oblivious.

"As I have said, I already have a Master. Sorry?"

Jingliu shook her head slightly, her expression shifting into something faintly exasperated.

"Too apologetic. What exactly has that boy been teaching you?"

Then, without warning, her attention shifted.

"In any case, why don’t we greet our guest?"

Yanqing blinked, confusion evident as her blindfolded gaze fixed directly on his shadow.

Sunny went still.

For a moment, he considered remaining hidden, weighing the risks against the benefits, but the fact that she had already noticed him rendered that option pointless, as his soul could still be attacked. After a brief pause, he made his decision.

He stepped out.

The Marble Shell encased him, the three-horned mask of Weaver concealing his identity as he emerged from the shadow with deliberate calm, his posture relaxed despite the tension coiling beneath the surface.

He said, his voice distorted and unreadable:

"Greetings. I am... Yanqing’s best friend."

Yanqing’s reaction was immediate.

"...What?"

Jingliu tilted her head.

And then she moved.

There was no hesitation.

No warning.

No indication that she had even processed his words beyond acknowledging his presence.

Her blade reformed in an instant, ice coalescing into lethal clarity as she lunged forward, her speed transcending what Sunny had witnessed moments before.

She aimed for his heart.

Sunny’s thoughts sharpened into a single, crystalline point.

’Damnation!’