Prologue

*AAAAAAAHHHHHHhhhhhh!*
Screams, oh those amazing screams! More! Lets hear more of those! With a bloodthirsty roar the giant hollow swung it's tail, flattening buildings and crushing soul reapers alike. It all seemed like a dream; like it wasn't real. To bad it was real, just as the hollow that was attacking. However, the hollow itself was as if it came out of a nightmare anyone would want to forget. They had created a new category to contain it; they had called it a royal.
The giant hollow looked like a dragon; it's size was unbelievable. The creature with it's wings folded, had the sun blocked out. When the wings were open, the beast could eclipse half of the Soul Society! This Royal's size certainly fit it's power.
The Royal had killed all of the captains, save for a much younger Shigekuni Yamamoto. He was the only one now who still had enough power to fight the infamous Royal, the thousand faced queen; for the knowledge of it being able to change its shape into just about anything it wished.
A loud roar echoed again, as if challenging the young remaining captain. With a swing of his zanpakuto the fight was started.
The Royal dragon had been impersonating a soul reaper for some hundred years, and in doing so became the first ever trained arrancar. What made her unique was she could turn her hollow mask into extra reiatsu; adding to the already unbelievable reserves she had. The soul reapers found out out she was really a hollow when they could nolonger teach her more techniques. That sparked her current situation.
Cutting and slashing, locked in a deadly dance to the death. The Royal had reverted back to her soul reaper form; only this time, the full hollow mask was on her face and parts of her body. Yamamoto, even using his bankai, couldn't scratch her. The dark, electric, and very heavy reiatsu was not only weighing him down, but it was also lashing back at him with a wave of her clawed hand.
He couldn't defeat her, but maybe, just maybe he could seal her inside something nearby and easy to maintain. A kantana. He moved, parring the next blow, the dipping to grab the sword.

(The sword was ice blue with white diamonds on the hilt, a golden star for the guard, and waves on the edge of the blade.

The sealing kido was started, and with the incantation finished a golden light enveloped the strange being. Her eyes widened.
Fleeing wasn't an option for her, and defeat seemed evident. The kido had worked. She was stuck, but to his surprise her reiatsu bonded to the entire sword becoming it's entity. It formed a zanpakuto, that seemed to simmer with hatred and pure evil intent when touched before it disappeared within the sword.
Yamamoto hid the sword for many years, with the beast inside it became silent. That was until fate decided a different course.

2000 years later
A young boy had found it's resting place, and started to train with it, putting it back everyday by nightfall. Yamamoto never knew. For the first time since he found the kantana; he forgot the time and trained on into the night.
"Do you wish for power, for greatness, or maybe for greatness? My name is Aisushado. Why don't you say my name out loud? See what happens," a voice purred to him.
"Um... ok then, Aisushado," he stated uncertainly. The sword glowed, frost encrusted everything nearby, more ice started to form something in-front of him. The mass of ice took the shape of a nearly clear oriental dragon. Its eyes flicked open; pure red and slitted pupils; they glittered with nothing short of pure hatred, but glazed over with false satisfaction.
"What is your name boy?", the obviously female dragon calmly asked.
"My name is Toshiro," he said back coldly, but still confused.
"Well then Toshiro, go and gather your belongings. I am taking to Seritei to become a soul reaper!", she said proudly.
"Wait, you are MY zanpakuto? And what about Momo?", he said concerned.
"Yes I am yours, and if Momo is really a friend, tell her to train, to make her way to Seritei. She will earn her way there just as you have," she explained. "Go, hurry now. Take that with you. I will wait here." She pointed with her tail towards the kantana in his grip.
He turned around and ran right out of the field.
"He has a weak mind, it won't be long till I am back on my throne as the Queen of the hollows," she growled lying down in the snow covered grass.
Foot steps roused, getting up at the last second, startling the new child with Toshiro.
"Ah, you must be Momo, came to say goodbye?" her fangs gleamed in the light of the moon.
"Y-yes. Goodbye Shiro. I'll see you again someday," the dark haired girl whispered.
"Come on little boy, get on my back, we leave right now," the large dragon demanded.
He did as he was told sitting down in-between two spikes by her wing joints.
"Bye Momo," he murmured just loud enough for her to hear. With that the ice dragon jumped and took off, swiping her wings across the sky.
Flying for about an hour had them circling just outside the force field.
"Hold on, boy," she hissed diving down, piercing the bubble and skyrocketing towards where all the captains were meeting; if their reitsu was any indication. She pulled up just in time to land softly and silently on the ground and let out a roar that shook the very foundations of the buildings.
"Quickly now, hop off,"she hissed, hearing him shuffle then drop off. Shattering into ice shards that disintegrated, the dragon was no more.
"If you need to call on me just say: Become lawless, Aisushado," she whispered inside his head just as the captains came running out.
"You boy, do you know what just made that noise?" Kenpachi growled.
"My name is not boy it is Toshiro, and yes, it was my zanpakuto," he stated back coldly.
"Your zanpakuto? You don't know it's name, nor can you call on it! What a joke!" Byakuya said emotionlessly.
"If I do, I get to join your academy. She brought me here to do that anyway," he snapped back.
"Very well Toshiro, release your zanpakuto if you can," Yamamoto said.
"Gladly. Become lawless, Aisushado!," he roared confidently. The ground frosted over, and the dragon formed behind him. Rearing her head as he held his kantana in a defensive position.
"That's impossible! How can you do that!," came the outbursts. Yamamoto was concerned, but the Queen couldn't get out.
"Well done. You will start in the soul academy tomorrow," he barked.
"Thank you Sir, Toshiro murmured bowing.
"Please follow Captain Hirako to your temporally room," Yamamoto drawled out. Toshiro started walking behind him stuff in hand, but he stopped long enough to sheath his sword, sending the dragon back into the kantana. Quickly catching up he eventually got to his room.
Upon Shinji leaving, little Toshiro was out like a light. leaving the connection between their minds unstable, and giving an opportunity for the Queen of the Hollows to adapt and soon become free again; even if it ruins young Toshiro's mind and soul in the process. Yamamoto would rue the day he sealed her. She will make him watch the destruction of the world, and the rise of the hollows.