In the midst of this chaotic battle, where the clash of steel echoed through the air and the scent of blood permeated their surroundings, the fighters engaged in a desperate struggle.

Their movements resembled a frenzied dance, devoid of elegance or finesse. It was a raw display of brute force and sheer determination. 

Splinters of wood floated in the air as both combatants leaped from one levitating platform to another, their weapons meeting in a flurry of sparks.

With a swift strike, Callis made the first move, his blade slicing her shoulder. However, Lis, undeterred by the pain, retaliated immediately.

Her kick landed squarely on Callis' face, momentarily staggering him.

As they flew past each other, she cleverly employed her weapons as a distraction, but Callis defended himself skillfully, utilizing the claw of the Laudoi.

-YOU WON’T GET MY SISTER! YOU BLOODY BASTARD!- Lis, her voice dripping with venom, spat an insult at Callis, her determination to protect her sister evident in her words. 

She paid no mind to the bleeding wound on her shoulder, a testament to the Beast Blade's unerring accuracy even in such adverse circumstances.

Callis, focused and resolute, remained silent, fully aware of his objective.

He gripped his Baltas Blade tightly in one hand while spinning the Laudoi claw in the other, its chain emitting a rhythmic whistle.

The tension in his bare feet increased as his retractable claws dug into the levitating wood, granting him stability before each clash.

Although he fought against his more primal instincts, the Beast Blade couldn't deny the surge of bloodlust coursing through his veins. 

The taste of his own blood lingered on his lips, a result of Lis' stray kick. The wind howled around him, amplifying the energy emanating from the ancient scripture etched into Rixa's arm. 

A primal thirst for battle stirred within him, urging him onward.

A roar wanted to erupt from Callis, bubbling inside his throat like boiling water, like a primitive cry to battle wanting to echo across the city.

Time was running short, and the chaotic battlefield had thrown him off balance, leaving him unable to contain the primal force within.

Meanwhile, Novus and Rixa remained locked in a struggle, energy coursing between them as Rixa's enigmatic tattoo connected with the Arcanist's hands.

In the midst of this tense moment, Novus couldn't help but let his curiosity get the better of him, despite the knife pressed against his neck. His words rushed out, disjointed and desperate, as he questioned the origin of Rixa's powers.

-Where did you get these?- Novus blurted out, his fear overriding his rationality.

-YOU ARE ASKING ME THIS NOW!? GET YOUR HANDS OFF ME BEFORE I OPEN YOUR NECK FROM EAR TO EAR.- Rixa, enraged and no longer able to restrain herself, responded with a threat, her knife digging even deeper into Novus' neck. 

Drops of blood seeped from the wound, some affected by the strange energy field, floating away like crimson bubbles. Others dripped down Rixa's arm, with one fateful drop landing squarely on Callis' face.

The impact of the blood droplet triggered a visceral reaction in the Beast Blade. 

His entire body tensed, and a thunderous roar he was holding erupted from his throat, reverberating across the nearby city blocks. 

The unexpected sound drew even more attention to their fight, gathering a crowd of spectators fascinated by the floating debris.

Lis, even though she had faced Callis numerous times before, had never witnessed him delving so deeply into his primal instincts.

She had faced a very different Beast Blade before, but she wasn’t ready for this one.

Caught off guard by this unleashed fury, the Pint-sized Berserker found herself unable to react in time.

Before she realized what was happening, the edge of Callis' Baltas Blade grazed her forehead, narrowly avoiding a more devastating blow as she instinctively jerked her neck back.

Callis, propelling himself against the floating debris, became a blur of motion, bouncing off surfaces four times before reaching Lis.

His attacks were relentless, initially superficial but gradually inflicting deeper wounds upon her. 

Her body soon became a canvas of bruises and lacerations, each heavy slash spraying her blood into the air. 

The onslaught wore down her weapons, unable to withstand the deluge of assaults from Callis, who showed no signs of relenting.

He only accelerated further.

Defiant and filled with anger, Lis shouted at Callis, her words laced with rage. 

-I'm not scared of you! Face me properly! Stop this acrobatic bullshit!- Her frustration and determination were palpable with each syllable that escaped her lips.

The Beast Blade transcended human limitations, his acceleration reaching unprecedented levels. 

The sound of his clawed toes striking the wood lagged behind his body, rendering him not a blur, but a mere distortion in the air, akin to a shimmering heat haze.

Lis was unable to keep up. 

Callis had surpassed the boundaries of the human realm, adapting to the chaotic environment and gaining an advantage over her that she could never hope to match.

Her attempts to track his movements only added to her confusion.

Her eyes, ears, and instincts contradicted one another, leaving her disoriented. 

Before she could comprehend what was happening, Callis initiated his final offensive.

A resounding thud caught Lis's attention as the jagged claw of the Laudoi embedded itself in the fragment of the barge deck beneath her, wedged between her legs.

As Callis continued moving the chain suddenly tightened, almost encircling her entire shin in one fell swoop.

-No, you don't!- Lis cried out, redirecting both of her weapons towards the chain.

However, before her attacks could reach their target, she felt a powerful tug from below.

Callis swiftly changed direction, not only circling around Lis but also passing over her. 

Utilizing his entire weight and leveraging a large piece of floating debris as a fulcrum, he yanked the chain, causing Lis to be hoisted into the air, hanging upside down by her leg.

Having secured the Laudoi chain against a protruding metal piece from one of the floating fragments, the Beast Blade assumed a running stance and propelled himself towards Lis with unwavering resolve.

His heart knew no hesitation, only a blazing fire fueled by urgency and duty. 

While many might assume that he had personal reasons for defeating the Serico Sisters, for Callis, it was never a personal vendetta but merely the fulfillment of his obligations.

For the first time, his bloodthirsty Saevus instincts and his dutiful Viani determination aligned, united in pursuit of the same goal. 

The Beast Blade acted without internal conflict or personal turmoil hindering his actions.

It was inevitable that the battle would end this way, with the convergence of both worlds within Callis granting him an insurmountable advantage, even in an unconventional battlefield.

As he propelled himself forward, he knew deep down that killing Lis was not the intended outcome. Yet, the closer he got, the louder the primal whispers inside his head grew.

"Kill your prey." "Display dominance." "Crush your enemy."

But as deafening as they became, the core of Callis' being was rooted in duty, overriding everything at the last moment.

The Beast Blade's fist struck Lis with such velocity that she likely didn't even see it coming. His knuckles connected with her chin, causing her neck to snap to the side in a swift, jarring motion.

The Youngest Serico Sister was instantly knocked out by the punch, leaving Callis free to finally climb the rest of the way up, to save Novus. 

But even as the battle was finished, the danger was far from over, as below him, the energy field created by the Ancient Spell Formula inscribed on Rixa’s arm was beginning to lift not only the trash from the river, but also the Hyacin River itself in large water bubbles.