Strongest Armor in every universe

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A/N:

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Aisu is inspired by 2 characters, one of them is Esdeath and I forgot the name of the second one.

2nd girl is a magic swordswoman with a magic castle of ice ability.

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Umm… I made a mistake. So, apologies, I will edit the previous chapters soon.

I used Special Jonin for the Elites like Killer B, Kakashi, and Might Gai.

Someone brought to my attention that it's used for:

1: Academy Student.

2: Genin.

3: Chūnin.

4: Tokubetsu Jōnin. (this rank is aka special jonin)

5: Jōnin.

5.5: Unofficial rank: Elite Jonin for the likes of Kakashi, Guy, and Itachi who are not yet kage level.

6: Kage.

LET THE CHAPTER BEGIN

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Here's a refined version of your edited scene:

During the Yuki clan extermination, Aisu fled the village, just an ordinary Jonin at the time.

Disappointment with both Kirigakure and the Mizukage, Yagura, fueled her determination. She dedicated herself to mastering the Yuki clan's techniques, pushing the boundaries through relentless training and experimentation.

Freedom from the constraints of a ninja village revealed her true potential. Unshackled, she discovered she was a genius, and in a remarkably short period, she ascended from a regular Jonin to an elite one.

It was during this ascent that she conceived the theory for her greatest jutsu: The Castle of Jadis.

Aisu was pleased with the results of her new forbidden jutsu. However, creating this technique had been a brutal endeavor.

The theoretical framework was in place, but the immense chakra required for even the initial experiments had almost driven her to the brink of insanity.

The solution was brutal—capturing unsuspecting ninja during their missions and draining their chakra.

Without a village to turn these prisoners into, she kept them in her secret lair for her grim experiments. Hundreds of lives were sacrificed, each one drained of their chakra, yet it still wasn't enough. She needed more.

The process had been slow, each failure grating on her nerves. Thirty experiments later, she had finally succeeded—but she had also realized the deeper truth.

'Chakra from prisoners alone isn't enough. I need more... something stronger.'

The technique Ice Release: Ice Age – Castle of Jadis required a massive amount of chakra, Aisu had figured out she needed as much as her own chakra and half her own chakra… i.e. 1.5x Aisu.

'I need to become a Jinchuriki'

With a tailed beast's chakra fused to hers, she could surpass the limits of her own power.

Determined, she devised a plan to capture a Jinchuriki and steal their beast. With this power, she intended to eliminate Yagura once and for all.

Without the aid of a tailed beast, she knew Yagura could kill her before she had the chance to summon her Castle, which was her only weakness.

When intelligence reached her that Yugito Nii, the two-tails Jinchuriki, was on a mission, Aisu felt a wicked smile form on her lips.

'Time to claim my prize.'

(A/N: In the original timeline nothing like this happened and Aisu died to either chakra sickness or by challenging Yagura in desperation or being assassinated by Lord Obito.)

Aisu rose from her throne and walked towards the fallen Yugito, it was time to extract Matatabi and gain her own chakra beast.

Each step she took sent a soft crackle through the frozen ground, the air around her growing sharper, colder.

Yugito's unconscious form lay sprawled before her, encased in ice. Aisu's castle was an impenetrable fortress, her domain, where she reigned supreme. Yugito never stood a chance.

Aki was frozen into a statue and was still conscious, desperately trying to break out of the ice and help save Yugito.

'Why was someone like her on this mission?' he thought, panic rising. 'This was supposed to be a standard escort, not… this.'

His thoughts were growing sluggish. The frigid air gnawed at his mind, his chakra slipping out of control. The ice had entered his lungs, his veins, his heart.

This low temperature was slowly but surely taking away even his ability to think. Frigid ice and frozen organs were not helping with his chakra control.

With this one Jutsu, if she had been alive during the war, she would have been the strongest enemy Madara and Akatsuki would have faced other than Hashirama.

She was a goddess of ice, commanding her element like a sovereign, bending it to her will. Maybe she is one of the Ninjas who would have been too strong to be included in the war. So, they had to die for the plot to work.

Aisu's cold voice cut through his thoughts like a blade. "Still trying to break free, little mouse?" she taunted, her lips curling into a playful, almost cruel smile.

She knelt down beside him, tapping a sharp nail on the surface of his ice prison. "It's cute, really. But you should know better than to struggle against me. All you're doing is giving me more to enjoy."

Her voice was light, almost sing-song. "Maybe I'll keep you like this. A nice, pretty ice statue for my throne room. What do you think?"

Aki's heart pounded in his chest; each beat slower than the last. He tried to summon more chakra, to move, to do anything—but nothing responded.

She stood, glancing at Aki one more time. His eyes, still wide with fear, met hers. "Sweet dreams," she whispered, her voice dripping with sadistic amusement. "Let the cold take you."

Aki's consciousness wavered, the last thing he saw being Aisu's smile, cold and cruel, as she prepared to claim her prize.

The thought that lingered in his mind as the darkness swallowed him was that this was only the beginning. Aisu, with Matatabi's power, would be unstoppable—and this jutsu (Castle of Jadis) wasn't even perfected yet.

Aki could think of at least seventeen ways to improve the Castle of Jadis, so its owner/inventor must also be aware.

Aisu turned her attention back to Yugito, brushing a lock of frozen hair away from the Jinchuriki's face with a tenderness that felt entirely out of place.

"Such a waste," she murmured softly. "You had so much potential. And now…" Her voice trailed off as she placed a hand on Yugito's chest, her smile widening. "Now, Matatabi will be mine. Thank you for being so generous."

Aisu had been inflicted with chakra sickness during her experiments, but inside her castle she could let extra chakra circulate within its walls, reducing its effects on her.

Aisu was breaking the seal over Matatabi.

Even Matatabi inside Yugito was unconscious, the battle had drained them both. With Aisu's focus being on both of them they couldn't even put up a struggle before getting drained to unconsciousness.

It was at this moment, that Castle began to shake. 'Earthquake?' Aisu thought to herself dismissing the idea the next second.

Something strong must be attacking from outside. The shaking grew intense as the seconds passed, and before Aisu could Identify the direction of the attack, the floor of her castle was invaded by thick roots.

Aisu reacted in time and sent her ice spears and activated the Ice Knight constructs within her castle to counter.

The invading woods were ruthless as some of them split and coiled around the Ice Knights and drained them of chakra dispelling them, while the rest of the roots kept charging at Aisu.

But Aisu wasn't useless against these roots she sent Ice Release: Ice Pillars and Ice Release: Ice Dragon of her own and spammed the rest of her Ice Release jutsu.

She went back to her throne and kept up with the incoming roots, but number of roots was overwhelming and increased over time as it kept draining the chakra from her techniques.

'What a Joke' Aisu smiled 'Draining Chakra from someone with an infinite amount'

She kept relaxed and countered every root, cutting them with the blades only for them to regenerate immediately.

'tsk tsk. This might be an issue.'

Aisu noticed the roots were also keeping up with her, the battle was about who could outlast who. The roots had infinite chakra just like her within her castle.

But the roots also were coming in faster and faster, bringing a smile to Aisu's face.

'How thrilling'

"Ice Release: One Hundred Ice Dragons" Aisu invented yet another technique in the spur of a moment.

Aisu had thought that there would be no one left in the world after she made her castle but this was a surprise, an unknown Jutsu keeping up with her.

She made spinning blades of ice to cut the roots as they regenerated, determined to not let them gain any ground.

She would have succeeded if these roots were normal, but alas they weren't. Roots of the God tree had invaded her castle and it started to break down, unable to keep up with the speed of the chakra drain roots.

'NOooo… it can't be'

Aisu finally realized the situation she was in when roots surrounded her throne breaking through every obstacle she threw at them.

Roots didn't stop after surrounding her, they encased her into a cocoon and started draining her chakra.

Aki had regained consciousness in the middle of this onslaught and realized he could control his newly awakened power 'Nativity of the god tree.'

He had freed the already drained Yugito from the world tree in time otherwise, two-tailed jinchuriki would be no more.

But Aisu, this monster had lasted longer than Naruto against these roots when she was their only target. During 4GNW, God tree roots targeted almost every shinobi in the field ignoring only the Edo Tensei.

'What a monster,' Aki thought.

These roots are way too broken, I don't think we need even infinite Tsukuyomi to unleash hell upon this world.

Right after Aisu was drained of her chakra and the husk of her body scattered by the wind, Aki lost consciousness once more.

After an unknown amount of time, "Aki wake up" he heard the voice of Yugito waking him up.

"Are we in the heaven?" Aki asked as he saw Yugito sitting near him with a face full of concern in the middle of the valley.

"No." Yugito replied coldly like her usual self and continued with, "Let's go"

Aki got back to his feet both he and Yugito were low on chakra so they had to walk back towards the camp hoping the battle there was easier and the Princess had survived.

As Aki and Yugito were on their way back, Aki thought to himself, 'Was that the plot armor? Also known as the strongest armor'