"Who are you?" Eero asked with flashed steps appeared in front of the Ulquiorra,
Ulquiorra didn't reply. He instantly raised his finger and pointed at Eero. A green beam flashed through his finger and pierced the Eero heart.
"Such an irony; the geniuses among geniuses in sereitei can't even handle one of my Espada moves." Aizen spoke with a mocking smirk on his face. Looking at the hole in Eero's chest, the heart completely disappeared.
Eero fell on his knees, his brow furrowed, a faint, bloody scent of his destroyed heart mixing with the humid air around. He glanced at the Ulquiorra walking toward him, the pain immense but strangely distant.
"I have been ordered to finish it soon; that's why I attacked your heart; although it's your shinigami weakness, don't worry, it won't kill you." Ulquiorra spoke, his voice utterly devoid of emotion, and then a syringe appeared in his hand. He pierced the neck of Eero, emptying the syringe inside his bloodstream, a cold, foreign substance flooding his spiritual veins. Then he opened the void gap beside him and walked inside, disappearing from Eero's vision.
Eero, sitting on the ground, bowed his head, but no one noticed the raised corner of his mouth, a silent, knowing smirk.
'Arancar powers acquired; next only Quincy is remaining.'
Eero thought to himself, and then he fell on the ground on his face; a white liquid spread on his body, and a melted mask materialized on his face, the transformation raw and violent.
Next moment, a horrible suppression spread around, covering a few hundred miles, the sheer density of his newly mixed reiatsu crushing the spiritual atmosphere.
"Let's go; we have to give the gotai thirteen a secret report," Aizen spoke, glanced at the Eero incomplete hollow transformation, then left the living world along with Gin and Kanami.
…
On the other hand,
After a while,
The world was a swirling vortex of white, a crushing pressure that threatened to dissolve his soul into the surrounding reishi. Eero's incomplete transformation was a roaring furnace of power, a berserk state his still-developing body could barely contain. Then, a sudden shift. The suffocating, primal pressure of the hollowfication slammed against something equally vast but structured... a will imposed upon the atmosphere. The raw, guttural roars tearing from Eero's throat were abruptly muffled, contained within a newly erected spiritual barrier.
Few figures appeared around Eero; all of them were wearing hollow masks. They were bathed in the pale, sickly light filtering through the surrounding barrier, their forms radiating a familiar, yet distorted, Shinigami Reiatsu.
"It's strange; his transformation is different from us; it's like he is controlling the hollowfication and guiding it." Shinji Hirako, the mask man with yellow hair, spoke, his voice a low, intrigued murmur beneath his hollow mask as he observed the Eero transformation. The white goo that had encased Eero's body was slowly receding, being drawn back into his very soul, yet the intense, suffocating aura remained.
All standing around him were surprised to see Eero twitching on the ground, his small frame convulsing as two diametrically opposed powers fought for dominance within.
Then one with curly hair and a mask, Kensei Muguruma, asked, his voice rough with astonishment, "It's impressive, but how is he doing that? No one can control the initial berserk wave."
"We will find out after taking him away; he is dangerous here. This level of spiritual pressure could dissolve the souls of anyone nearby in the Living World." The yellow-haired man spoke, the tone now decisive, and then everyone glanced at each other, their collective hesitation giving way to a shared, cautious nod.
…
Few hours later,
Inside deep underground, a secret place was filled with extremely high pressure... a meticulously constructed Kido barrier pulsing with barely contained power. The whole secret space was trembling as if it couldn't contain the pressure inside, the air humming with a deep, unsettling thrum that clawed at the edges of their own Hollow-infused Reiatsu.
"Why isn't this guy's transformation not completed yet? Soon this space will burst." A short female spoke with freckles on her face. Hiyori Sarugaki, the brown-eyed female with her hair bound in three spiked ponytails, yelled, her hands balled into frustrated fists as she stood beside the bound and unconscious Eero, pointing an accusing finger at the young-looking male with yellow hair.
Shinji shrugged, a faint, almost nervous smile playing beneath his mask. "Don't worry, I am managing the space; it won't burst." Suddenly Hachigen Ushōda, a round, fat man spoke with a kind smile on his face, his form sitting casually on a recliner. He adjusted his glasses, his massive spiritual power calmly counteracting the strain on the barrier. "I assure you, Hiyori, this little space of mine can handle a bit more."
Instantly the shaking stopped, the high-pressure atmosphere stabilizing with a heavy, palpable click. All of the Visored members' pupils shrank in stunned surprise as their attention was violently pulled from the passive reading of their barrier. They turned around, seeing a figure standing. The chains that had bound him lay fractured on the stone ground. He held a dual set of swords... one a pure, dull gray, the other a vibrant, purple-gold blade... each sheathed in its respective scabbard, hanging on both sides of his waist. His expression was calm, a serene look that belonged on a meditating monk, not a newly hollowfied victim.
"Sorry, it took me some time to control and balance both opposite powers in my body. The sheer abundance of raw power required a recalibration of my soul." Instantly, Eero spoke, his voice quiet but carrying a profound authority that belied his apparent youth. He sheathed his newly acquired swords in the scabbard hanging on both sides of his waist with slow, deliberate movements. The sound of steel kissing wood was sharp in the silent chamber.
"You have gained a new Zanpakuto after gaining the power of hollow." Shinji, the yellow-haired man, walked cautiously toward him, his intrigue now laced with outright wariness. He looked intently at the dual swords... the mysterious gray blade and the new, alien-looking purple-gold one.
...