(WARNING: Heavy Info/lore dump incoming!)

Kingdom Hearts 4 Trailer Music

There was a traffic jam in the centre square of the city. People had already gotten out of their cars to see what was going on. They all walked between the cars to get to the centre of the commotion. They expected to see a fallen truck or crashed cars, but instead, they saw many black tendrils floating around in a small tornado like fashion.

Suddenly, the swirling got quicker, and more tendrils were coming from around the city, all joining the tornado to form a massive, black ball. The huge ball began to hover higher into the sky, towering over everyone below.

Without warning, the ball dispersed and the faint image of a huge creature took its place. As its ghostly feet hit the ground, it turned completely solid, shaking the ground. More and more of its body filled in, creating a full image. The massive creature opened two wings on its back, creating such a huge amount of wind pressure that it shattered the windows of the skyscrapers around it. Cars suddenly began to float upwards, caught in tendrils of Darkness.

The monster opened its eyes, revealing a glowing yellow and let out an ear-piercing roar to the world.

The people down below finally realised they were in danger and ran away from the creature. Someone tripped and scrambled to get back up. A woman yelled at a man to stop filming the event on his phone and run, which he obliged with a scream. A mother grabbed her child's arm and joined the crowd as the monster took a huge forward, crushing multiple cars under it.

The young girl struggled to keep up with her mother, she looked ahead of the adult, to see how many people were running. But something caught her attention. There was an older boy, running in the opposite direction, towards the monster. He wore a F/C shirt with a black jacket over it with long pants. He sped past the girl with great speed as he approached the monster.

People began to stop and turn back around after seeing the boy. They all gathered in a crowd as they watched him.

"What is he doing?"

"Who is he?"

"What's he going to do?"

Y/N didn't look back as he picked up speed, running even faster than before. He reached out one hand as it began to glow. With a bright flash, a silver and yellow, key shaped sword appeared in his hand and he held it tightly.

The monster looked down on the person and roared again. Y/N veered sideways and jumped to an electricity pole. He hooked the Keyblade onto the pole and spun around on it for a second, gaining momentum and leaping forward onto a floating car. He jumped into open air and spun around. The hanging keychain on the Keyblade suddenly shot out like a grappling hook, hitting the next floating car and throwing him forward higher into the air.

The giant Heartless roared and threw a punch. Y/N effortlessly dodged it and jumped straight to the flat surface of a skyscraper. Enveloping himself in blue light, he began to run straight up the side of the building.

When he reached the top, he leapt off it, backflipping gracefully and landing on a floating piece of debris. Sliding down on it, he jumped off the edge and blitzed toward the monster. The Heartless raised one of its fists and threw another punch. Y/N twirled around and hit the fist head on.

The Keyblade spun just in front of him like a shield. When he gathered enough energy from the Heartless strike, he pushed off, knocking the Heartless off balance. With enough energy siphoned, he went into Second Form, his clothes changing colour.

He used more Flowmotion to speed into the Heartless' face and hit it in the eye. The Heartless reeled back further, flattening a bridge under its foot. The Heartless reached its hand out to grab him. Y/N simply evaded and slipped through the gaps between its fingers. He locked the Keyblade into the Heartless' arm and spiralled down it.

The Heartless roared in pain, seeing its arms being torn to shreds. Y/N flew past its shoulder, spinning around as he fell towards the ground. Right before he hit the ground, he locked into a lamp post and spun back up to the Heartless at the speed of a missile, hitting the back of hits head and a small explosion sounding out.

Y/N gained altitude over the Heartless and flipped his Keyblade again into reverse grip. Once again, his clothes changed colour to dark blue with black flames insignia on his pants. His feet glowed, as if standing on air. He had gone into Wisdom Form. He aimed the Keyblade and fired a barrage of laser projectiles at the Heartless, dotting it with burning marks.

He dodged a wild swipe of the hand of the Heartless and charged up energy into the Keyblade, finally releasing a huge beam into the Heartless' face, covering the entire thing in bright blue light.

With the energy expelled, Y/N went back into his regular clothes and fell down towards Heartless. With a loud yell, he swung the Keyblade downward and struck straight through the Heartless' head.

He fell back to the ground, flipping mid-air and landing on his feet, going into a roll and landing in a perfect crouching position with his weapon held out to his side. The Heartless let out a defeated roar and fell backwards, hitting the road and dissipating, leaving nothing behind.

Y/N stood up finally and unsummoned the Keyblade, exhaling loudly and opening his eyes. A huge crowd of people were slowly walking towards him, whistling and clapping their hands. The sirens of police cars could be heard. Y/N turned and saw several of them pull up behind him, police jumped out and began to examine the area, others asking people what had happened.

The answer was the same. Every person pointed at Y/N and recounted what had he had done. "And then he was like, whoosh! Voom!" A young girl said, swinging an imaginary sword to her made up sound effects.

One policeman walked up to him. Y/N was breifly taken aback by his appearance, he had a regular human body, but his head was a computer monitor. "Is what they say true?" He asked.

Y/N pulled out his Keyblade and showed it to him. "Yes, uh...". He quickly checked the man's badge. "Mr Monitor. I stopped that huge monster".

"There've been reports of a guy about your age fighting other monsters just like this one. Why? Mr Monitor asked.

"Well, their dangerous. And this weapon is the only thing that can really get rid of them for good," Y/N replied. "I promise, I'm on your side".

"I wasn't in any doubt," Hal Monitor said, his screen face turning into a cheery smile. "As far as I'm concerned, your a fellow...enforcer of justice!" Y/N smiled back and thanked him for the support.

Then, he stepped away from the scene, pointed the Keyblade at the nearest lampost and shot straight towards it. He circled it and shot high into the sky, people pointing after him as he practically flew away.

As he began to descend, he aimed for a tall building and landed on the rooftop of it. He walked to the edge of the building and looked out over it. Karli had released a lot of Heartless into the world when she had died. Y/N had been fighting them back as he could, and he was succeeding, even getting stronger too. Maybe now with that big one gone, that was the last of them.

Y/N continued on his way, using Flowmotion to speed his way back to the castle. He landed just in front of the door put his weapon away, then he opened the door and walked inside. He was immediately greeted by his friends, they had already seen what had happened.

"That Heartless was huge! But you still took it down!" SMG4 cheered.

"They really stand no chance against you know. You've gotten so powerful recently," Meggy complimented. "You got to see if I can learn any of that agility from you!"

"About time, you've Been a total Wimp until now. Like Boopkins," Bob said.

"Hey!" Boopkins cried.

"Thanks guys! I really feel like I've accomplished something now, it's something I've needed for a while and now I feel better than ever now," Y/N said and struck a small pose. "Don't worry, Organisation XIII won't know what hit them once I'm at full strength".

There was a moment of silence as everyone glanced at each other. "You mean, you aren't at full power yet?" SMG4 asked.

"Well...no," Y/N said as he looked down, feeling ashamed to admit it. "I know I've been training and fighting a lot recently, and I know that means that I haven't always been around. But I can sense I'm close now".

"Hey, don't worry about us," Meggy said, as she sat down on the stairs. "You've got a big responsibility. Now that we all know what you need to do, we can't really get annoyed at you".

Y/N had a small flashback to when he had finally explained to everyone what had happened and how he got here. It was...dramatic to say the least. Tari was so shocked that she couldn't speak for few minutes. Meggy felt bad for being mean to him for the first few says since his arrival and had immediately apologised. Saiko just flat out didn't believe him, saying that he was lying. But he eventually got her to. Bob's was similar to Saiko, except more offensive. Boopkins got too huggy after that. Luigi probably had the most calmest reaction, but he had offered his help in any way he could.

"Thanks for understanding. And don't worry, we'll hang out soon". Y/N said. "I'm going to go outside for a bit, you know, just to calm down after that fight". He then stepped back out the door and outside.

The sun had set and the sky was now darkening. Y/N walked to the edge of the lake and looked up at the now appearing stars in the sky. The crescent moon nearby.

His moment of peace didn't last long. Y/N felt his neck bristle and he spun around. A corridor of Darkness opened up in front of him and as he had expected, a cloaked person stepped out. Y/N took his stance. "Your with the Organisation! Who are you? I took one of you out, I can do it again!"

The Mysterious Figure didn't say anything. Instead it raised one of its hands. "Hey! Say something!" Y/N shouted. The Figure closed its hands around thin air and a sword of blue light formed in reverse grip. The same happened for the other hand and it took its own stance.

KH BBS OST - Dark Impetus

The two beings stared each other down for a moment. Something about this person was so familiar. Y/N had a feeling he knew who this person was, but to be sure, he had to get that hood off.

Before he could think any further. The Mysterious Figure suddenly charged forward and delivered a lighting fast combo to his chest. Y/N was knocked back. The Figure jumped into the air and threw one sword forward, the blade extended like a whip and caught Y/N by the foot. He was dragged back into the air and thrown into the ground.

The moment Y/N stumbled to his feet, the Figure dashed forward and seemed to blur out of focus.

Suddenly, the number of enemies went from one, to five cloaked people. All at once, they slammed their weapons into Y/N, knocking him all around the area. Four of them jumped back while the fifth swung its blades in an X shape and a flaming cross shape sped towards him, throwing him even further back.

The Mysterious Figure reformed into one person and summoned a black glyph shape from the ground and sent forth a mini tornado. Y/N had no chance of dodging it. The moment the tornado hit him, not only was he now so dazed that he could barely see, it was also like he had forgotten how to do anything. He could barely shoot forth a spell now. Slowly, he could feel it coming back to him, but slowly.

The Mysterious Figure appeared, now split into four people and descending toward him. Y/N barely jumped out of the way, rolling across the ground and casting Fira. The large fire ball hit one of the cloaks and they dissolved into the air. The remaining three charged forward, they became blurs as they swung their weapons in perfectly synchronised moves, each one complimenting the other.

Y/N jumped over them and air dashed away from them. With barely seconds on his side, he charged up the Keyblade and sent a small ragnarok volley. It was just enough to dissolve two other figures, leaving just one more.

"Got you," Y/N said. He cast Blizzard and backed it up with Areo, splitting the ice into shards and sending speeding towards the Mysterious Figure. The enemy just seemed to faze right through the projectiles and dashed forward, hitting Y/N again and again.

Y/N stepped back, then ran forward, surrounding himself in lightning and charging right into the Figure. That seemed to hurt it. It visibly spasmed and sloppily rolled away, stumbling a little on its feet and resuming its stance, revaluating its situation.

The Figure dashed forward, its arms held out behind it. It jumped and front flipped multiple times, becoming a blur as it slashed downwards. Y/N tried to block, but was knocked off balance and landed on the ground. The Figure did the same move again. Y/N pointed the Keyblade to the sky and a bright sphere surrounded him, blocking the blow. The sphere then shattered, sending out a shockwave that pushed the Mysterious Figure away, falling onto its back.

Y/N kicked himself to his feet and went on the offensive, casting Ars Arcanum. The Figure couldn't block them all as direct hits landed on it, breaking its guard. Y/N delivered a strong strike to its head and staggered it backwards.

The Mysterious Figure straightened up immediately and jumped forward for downward strike. Y/N saw it coming and quickly parried it. One of the swords was knocked out of the Mysterious Figures hands. Another swing, which the Figure tried to block but it ended up with losing its other sword.

Y/N kicked the Figure in the stomach, throwing it onto the floor. He raised his Keyblade and screamed as he brought it down... and was blocked by a clock themed Keyblade. The Figure pushed Y/N away with the new weapon in its hand. It stood up and spun the Keyblade so fast it looked like a clock rewinding. When the spinning stopped, the Figures exhaustion looked like it had completely faded, along with any injuries it may have sustained during the fight. Y/N on the other hand, was left more tired than ever.

Unexpectedly, the clock Keyblade dissipated and the Mysterious Figure dropped its guard. "All those hits and you still haven't gone down," The Mysterious Figure suddenly said. Y/N immediately recognised that sassy, condescending tone. The figure reached up threw back its hood, revealing Young Xehanort.

"You again!?" Y/N shouted.

"I'm so honoured you remember me," Young Xehanort said sarcastically.

"Why are you here?"

"For many reasons. First off, I'd like to congratulate you for managing to handle yourself in fight against me. For now, you've earned my respect, Y/N," Young Xehanort smirked.

"Yeah, whatever," Y/N spat. "You're just trying to cover up the fact that I'm a threat now!"

"What? Because you defeated Kirlax?" Young Xehanort broke down into fits of boyish laughter. "All she ever did was cause problems and argue. That's actually another reason I'm here, to thank you for defeating her, and the Heartless she brought with her. You've done the Organisation a favour".

"Her name was Karli and she was a person!"

"And you knew her so well? You don't know half of what she was or what her comrades used to be," Young Xehanort threw up his hands dramatically, his smile never leaving his face. "Not even they know".

"You...your lying to your own members? How low can you go? What are keeping from them?"

"Well, I guess you've earned that at least," Young Xehanort murmured. "Alright then. The Organisation traditonally has thirteen members. Numbers one through four consist of Xehanort, myself and two others with close relations to him.

"Numbers eleven through thirteen are powerful Nobodies that we've picked up along the way. One of them was stationed here, and told us where you were, it was how we found you here".

"Finally, numbers five through ten, Kirlax included were let in for a very specific reason. During the Second Keyblade War, my future self was actually the age I am now. Back then, he was regarded as 'Young Xehanort'. After his defeat, he was sent back to his time to live out his life with no memory of what had happened.

"But something happened. A change in space and time. A strange man told him of what would happen of he tried to progress through the path he was supposed to and offered him a way out. He agreed and was sent to the time many years after the Second Keyblade War. By that time, the Guardians of Light; Sora's friends had passed on their power to new apprentices. Six of them to be exact. Xehanort killed their Master; Yen Sid, and turned them all into Nobodies. They make up a portion of the new Organisation XIII".

"Then Karli...".

"Was an apprentice, her power was passed on from a boy named Ventus. She was weak, it was quite well predicted she would fall to your hands. Now, for the final favour I'm giving you. The organisation's number II has finished his plan, he will act soon. And he's taking several members to help him. I hope you are ready for our next trial for you".

"What trial? What do you want with me!?"

A corridor of Darkness opened up behind him and Young Xehanort stepped through. Just before he disappeared, he looked back at Y/N and his usual annoying, condescending expression had faded, being replaced by something else. "It's not my decision, the future has already been written. Time...is a cruel prison".

The corridor of Darkness closed and Young Xehanort vanished, leaving Y/N completely alone in the dark, to ponder what this trial that Young Xehanort had spoken of.