Ios's eyes burned with hatred, deep as an endless abyss, incinerating any will to resist. "Don't think you can escape!" he roared, charging forward at supersonic speed. The space around him distorted, electric waves emanating from his body as if to tear the battlefield apart.

"Sis Emilia! Watch out!" Rias shouted, but it was too late.

Ios barreled into Emilia, unleashing hundreds of punches in the blink of an eye, each strike crackling with explosive electricity. Emilia raised her sword to block, sparks flying like fireworks. Her blade quivered under the overwhelming force, and she had to step back to maintain balance.

"Bastard! Get away from my sister!" Rias gritted her teeth, her energy cannon glowing. She rushed from behind, aiming at Ios's back, but he turned abruptly, predicting her every move.

A lightning-fast kick hit the cannon, deflecting its blast, which pierced through distant snow mountains. Rias hadn't recovered when another punch from Ios struck down, and she rolled to dodge, quickly aiming her cannon at him.

"Faster! We need better coordination!" Emilia shouted, launching into the attack.

She dashed like a golden streak, her sword emitting a brilliant energy. Her slash was powerful, but Ios was no longer the same. He took the blow as if it were merely a breeze.

"Haha! You think this can hurt me?" He laughed, his laughter resonating like thunder, and he countered.

A colossal punch descended like lightning, the ground cracking, air shredding. Emilia gritted her teeth, enduring, but each hit forced her to retreat.

Rias seized the chance, firing a salvo of shots at him. Explosions engulfed Ios's body, but as the smoke cleared, he remained unscathed.

"Emilia! He's getting stronger!" Rias cried, her voice tinged with despair.

The two girls fought fiercely, coordinating closely to contend with their formidable enemy. Emilia's slashes and Rias's shots inflicted damage on him. However, Ios had changed.

With each received attack, his power grew, his speed increased. His punches were hurricane-force, descending as if he represented the very sky and earth.

Rias and Emilia gave their all, but quickly realized that the longer Ios fought, the stronger he became. Each strike became harder to dodge, his sharp counterattacks gradually overpowering both.

Emilia squinted, sweat beading on her brow despite the subzero snow. "If we don't do something now, everything ends here." In a critical moment, as Ios pressed Rias into a corner, Emilia took a deep breath and unleashed one of her aces.

"From Atheria’s Valori to the Light Energy Dimension Nexus: Divine Mirror Bind!"

In the dark night sky, twelve massive mirrors appeared, floating like fallen stars. Their light was radiant, but the mirror surfaces were shadowy, reflecting Ios's image from every angle. Each mirror vibrates slightly, creating a clear, bell-like sound, but inside held terrifying control.

Beams of light from the mirrors shot out, binding Ios's body. The swish of energy filled the air, mingling with Ios's frantic roars as he struggled. "You think this can hold me?" He growled, eyes glowing red, but every time he moved, the light beams tightened, making his muscles quiver.

"This is our chance!" Emilia shouted, her voice echoing like a battle cry.

She swung her Great Light Blade, its tip glowing intensely, shooting like a comet towards Ios. She was enveloped in radiant golden light, each move slicing through the night sky. Her blade aimed straight at Ios's chest.

"From Atheria’s Valori to the Light Energy Dimension Nexus: Heart-Piercing Mirror Strike"

Her blade targeted his chest, where the mirrors' light was most concentrated. The air seemed to freeze for a moment, all sounds swallowed by the wind's whistle from her descending blade. Light beams from the mirrors combined, launching energy that tore through all his defenses.

Ios trembled. The energy beams seared his body, stripping away the accumulated strength within the Alsma commander. He roared, a deafening sound making the earth shake, but his body remained trapped in the energy cage.

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"Ends here, Ios!" Emilia shouted, her blade brighter than ever, mere inches from his chest.

But at that moment, all energy veins across Ios's body flared. Suddenly, his hands reached up and grabbed the blade. The screech of metal filled the air, the light from the blade flaring desperately. His hands, like steel, formed an impenetrable wall.

"You'll never have enough strength!" Ios roared.

Emilia strained with all her might, veins bulging in her arms, her body trembling under the immense pressure. A feeling of helplessness crept in. Despite all her strength, her sword couldn't pierce the wall Ios had erected.

"Rias! Attack!" Emilia screamed, her voice cracking under the strain.

"But... you'll be hit!" Rias hesitated, her hands shaking on the cannon.

"JUST DO IT!"

Emilia's shout was like a hammer, breaking the chains binding Rias's will. Tears streamed down her cheeks, but she gripped the Mystic Accelerator No.5, her eyes burning with resolve.

"From Atheria’s Valori to the Quantum Dimension Nexus: Explosive Atomic Cannon!"

The cannon glowed; a pure atomic energy beam shot out with a piercing scream like the roar of nature itself. The silvery-white beam raced towards Ios, slicing through everything in its path.

The massive beam collided with Ios's shield, creating a deafening explosion, the light wiping out the battlefield. The shockwave from the blast swept across, blowing away everything within hundreds of meters, leaving only debris and dense smoke.

As the light faded, through the gray smoke, Ios's silhouette emerged. His body, still bound by the mirrors, his hands gripping Emilia's blade, remained unmoved after Rias's attack.

"Is that all?" His voice was icy, stabbing into the hearts of the two female warriors.

Rias collapsed, her hands trembling, her eyes filled with despair. "No... it can't be..." She mumbled.

Emilia channeled more energy into her blade, trying to pierce down but to no avail. She gritted her teeth. "Damn it!"

"Fools! In this state, my power can rival Irod and surpass all other Commanders!"

Ios roared arrogantly, his voice echoing across the battlefield like deafening thunder. His red eyes, full of disdain, stared straight at Emilia, who was struggling to finish him with the radiant Great Light Blade in her hand. The massive energy from his body distorted the surrounding space, the mirrors starting to crack and shatter, waves of energy surging like storms.

Emilia took a deep breath, gripping the blade tighter, pressing down with all her might. Her heart pounded, not just from fear but from unyielding determination.

"You can't surpass us, Ios! Today, you will fall here!" Her voice rang out, though her body trembled under the overwhelming strength of the enemy.

"Scream all you want, it's useless!" Ios grinned.

Emilia's blade still aimed at his chest, the light from the blade seemed ready to pierce the heavens. Only a short distance left, it seemed she would succeed.

"Alsmaniac Skill: Stormy Lightning Force"

But just then, Ios's eyes blazed, his mouth opened wide, a terrifying wind surged, and from deep within his throat, a brilliant red energy burst forth, shooting straight at Emilia.

“Noooo!!!” Rias screamed from afar, her eyes wide with horror as she witnessed the scene.

The energy torrent rushed like a fire waterfall, shooting straight at Emilia. The overwhelming pressure from it seemed to crush the air, creating a piercing whistle. Emilia struggled to dodge, but her body felt pinned in space.

“Damn it!” She gritted her teeth, every muscle straining to break free from the invisible grip, but it was all in vain. The energy beam struck her.

An explosion like the heavens and earth splitting echoed. The energy shield around Emilia shattered in an instant, glittering fragments falling like fading stars. She was blown far back, her body crashing into the cracked ground. Blood spilled from her mouth, her vision blurred, but her hands still gripped the sword tightly.

“No! Emilia! It can't be...” Rias collapsed, her voice breaking, tears streaming down her face.

Emilia raised her head, her eyes weak. “Rias... protect everyone... no matter the cost...”

Cough... cough... Emilia bent over, coughing violently, fresh blood splattering on the cold white snow. Each breath felt like a knife slicing through her chest, heavy and painful. The energy armor of Atheria’s Mystique was shattered. Her body trembled, fragile against Ios's monstrous strength.

Another red beam shot towards her, like the sword of death. “No... not now!” Emilia tried to resist, but her legs had lost their strength. Before she could react, the immense impact hit her chest, flinging her away like a falling leaf in a storm.

Her body was swept away, far from the battlefield, past sharp rocks, plunging into the deep sea.

The icy water engulfed Emilia, extinguishing any remaining spark of strength. She sank, her weak form drifting in the endless dark space. The battlefield's wind howls above faded, replaced by the terrifying silence of the ocean.

Emilia's eyes opened slightly. “Is this... the end?” She thought, the sky's light dimming in her view. Her heart ached, not from physical pain, but from helplessness.

Darkness slowly enveloped her, her breath slowing, her body heavy. Cold water seeped through the broken armor, touching her skin like a thousand sharp knives. She tried to struggle, but her strength was gone, her hands no longer obeying her will.

“I don't want to die... Not like this...”

Emilia's tears mingled with the seawater. In her final moments, she closed her eyes, letting herself drift with fate's current. The last light on the water's surface faded, cold darkness swallowing her. A golden glow from the Great Light Blade sank slowly to the bottom.