Legacy of Hearts

Author's Note: Hey guys! I thought it was time that I finally diverged from my usual Harry Potter fan fiction so I decided to do something a little different…a Harry Potter crossover with Kingdom Hearts! In a way this story will be a tribute to all of my favorite things so don't be surprised to find quite a few of my other favorite things in here…I'm planning a possible visit with Link and possibly a trip into the world of His Dark Materials…anyway, we'll see how everything turns out. Chat later, hope you like this story!

Disclaimer: Harry Potter belongs to J.K. Rowling, Kingdom Hearts to Square Enix. I am neither of those though it is my greatest wish that I should someday have my own Sora to love…and my own Harry to love…and my own Riku…and my own Sirius…and my own Cloud…and my own Snape…….

Ansem Returns

The Keyblade Master is not alone…he must open the door to the light but another will come on his own quest. The way to light is through darkness. A door will open, another will close, and only together will they uncover the truth beyond the shadow.

Harry sat up in bed, wrinkling his forehead at the words he had just heard. Keyblade Master? What could that be? And the voice in the dream, so strangely familiar, but not full of malice…no, not at all, in fact, there had been a strange sort of kindness to it.

He shook his head and threw off the covers, walking towards the window. There was no electricity outside, and the only light outside was the glistening of rain on the street. A sudden summer storm had knocked out all the power on Privet Drive and since Harry couldn't use magic outside of school he had to forget about the homework he had been planning on doing and, with nothing else to do or nobody to talk to, he had gone to sleep, only to be awaken by the strange words—to be startled by the strange feeling that he was hovering in midair.

Pulling open the window, he stuck his head out in search of Hedwig, his snowy white owl who he had now had for almost five years. For a moment he thought he saw a patch of white in the shadows of the sky, but he also supposed it could have been his imagination. After all, the storm had probably driven out all manners of creatures that usually hid under leaves and in tree trunks…Hedwig was probably having a feast.

He rumpled his hair and sat back down on the edge of the bed. Usually when a dream stuck out like that, it meant something. But what? In all his reading and studies at Hogwarts, he had never heard anything about a Keyblade, and certainly not a Keyblade Master. And then there was that stuff about the door and the light…

"I suppose I should write to Dumbledore or something," he said out loud. Slowly he got up and sat down at the desk, pulling out a spare piece of parchment. He thought for a long moment and decided to just jot down the words he still remembered, and to ask what Dumbledore might think they meant. Then he sealed it and set it aside, knowing it might be a day or two before his owl returned.

Glancing at his watch, he saw that it was almost three in the morning. He thought wistfully about climbing back into the covers and trying to get back to sleep, but realizing that it would probably amount to a useless effort, he instead pulled on a pair of jeans and a T-shirt, absently grabbed some trainers, and tucked his wand into his shirt in case anything should happen. As an afterthought, feeling the chill air from the spaces around the window, he searched around for a jacket or a sweater. Of course, since it was summer there weren't any handy, so he decided to just take a school robe—after all, none of the muggles would think much of it, they would probably just think they were seeing things.

He walked downstairs, rolling his eyes when he heard the twin snores of his uncle and his cousin, Dudley. He exited the house quickly, worrying only slightly that it wasn't the best idea for him to be wandering around after hours. After all, he had found out only a little while before what the effects were of putting himself in danger…

But no, he wouldn't think of it. Sirius had only just died…the wounds were still too deep. He shoved his hands into his pockets and took off down the street, walking slowly because he could barely see the street in front of him.

He turned away from the main street and began making his way towards the old park where Dudley and his gang had tortured the youths until the local cops caught up with them and contacted their parents. It was incredibly run down, and the one swing that had been up the previous summer had finally been ripped down. Now it was mostly the home of stray pets and other such things, but he was strangely drawn to it this night.

He set foot on the grounds and looked around. It was a pitiful sight, really, and he almost wished that he could use magic just to clean the place up and fix a few things. One of the few happiest memories of his childhood were the rare times he had been able to escape from Dudley—he had come here, and played by himself on the old equipment.

Sitting on a bit of concrete that was still intact, he sighed. Then, for no apparent reason, he looked up into the sky just in time to see a bolt of lightning streak from the heavens to the earth.

He jumped up quickly. "It's going to storm again!" he muttered in irritation to himself, but then more flashes of light began to rapidly encircle Harry, flashing and fluttering, and then a small black creature emerged from the ground. It twitched its antennae and rolled its bright yellow eyes before lunging at Harry. He pulled out his wand, wondering what the creature was and what sort of spell could be effective on it, but before he even had time to think more had appeared and began to surround him.

"What the…" he began.

"Come with us, Harry Potter…" said a voice.

He whipped around to see a tall hooded figure facing him. "Who are you?" he said anxiously, knowing the voice didn't belong to Voldemort, and yet still knowing how deadly it could be.

"Harry, you must come with us…come with us into the Darkness…" it continued. The voice was deep, and rumbled with an intense clarity. Harry involuntarily shuddered.

"What are you talking about?" he said. "Are you working for Voldemort?"

Suddenly the robed figure began to laugh, a hollow echo that chilled Harry to the very center of his heart. "I work for no one," said the figure. "I am the master of Darkness, and so I am the master of men's hearts. I will prove what lies beyond the door of Kingdom Hearts…I will show them all that it is true, black, darkness…"

"What the heck are you talking about?" said Harry, attempting a nervous laugh although he wasn't entirely certain that the person wasn't entirely insane. "Kingdom Hearts?"

"Come, Harry, come with me…"

"No!" Another voice this time, from behind. The hooded figure jerked around suddenly, and in his hands there appeared a shining blade that, to Harry's shock, resembled a key.

Another hooded figure, this one with grayish white hair. "I said, leave him alone Ansem," he said. "Sora has disappeared…you won't take this one as well."

"Riku…I see that you are well again," the hooded figure laughed. He removed the hood of his robe, revealing a stern face with cold amber colored eyes. "I take it your heart feels whole again?"

Riku clutched his chest. "How dare you…"

"Remind you of your own weakness?" he said. "But we are all weak Riku…or at least, all of those are who do not realize the potential of the darkness in their hearts."

"Sora showed you the truth; he destroyed you once with the light that lies in Kingdom Hearts…"

"But I returned, did I not? And where is your precious Keyblade Master now?" Ansem retorted. Harry was slowly backing up and raising his wand. The only problem was he wasn't certain if he should take one and leave the other, or take them both. Then, to his surprise, Ansem slashed out at Riku with his own Keyblade. Before Riku had time to defend himself, Harry had hit him with a jet of bright purple light. The man stopped dead, body rigid.

"What did you do?" said Riku suddenly. He was looking at Harry's wand as if he had never seen anything like it before. Harry looked at him, and felt his stomach turn a flip. He had noticed two things at once—one, that this Riku now held two Key-shaped blades in either hand, and that he also appeared to be right about Harry's age.

"A stunning spell," Harry said, "but it'll wear off in a few seconds…"

"Then we have to go!"

"What are you talking about?" said Harry.

"I mean…well, we have to get you out of this world, before the heart is destroyed!"

"What are you talking about…" Harry said.

"I'll tell you later, but right now you have to trust me. There are those that exist who have no hearts…those are the ones who you saw earlier, who were driven away only when Ansem came. But they're doing something to these worlds…they're taking the hearts of worlds themselves. Ansem must've come because of you; otherwise…otherwise he would just have let it be destroyed…"

"My world?" Harry said in confusion. "Destroyed? What are you talking about?"

"Just come on, we don't have time to talk! It's beginning already!" With that, he pointed at the horizon. Harry spun around and stared at the spot Riku was pointing towards. He saw nothing for a long moment, and couldn't understand what he was looking at, until he realized that there was nothing to see.

"The world! It just…ends. Where did it go?"

"Come on!" Riku said. "We have to get out of here!"

"I have friends here!" Harry said, thinking suddenly of the Weasleys, and Hermione, and all the other people he knew in the Wizarding world.

"Hopefully they'll make it to the City! Otherwise, the only way to bring them back is to destroy whatever it was that is taking this world's heart. Come on…" he extended his hand to Harry, his eyes full of a mixture of hope and fear.

"All right!" Harry grabbed hold, vaguely hearing Riku telling him that, whatever he did, he couldn't let go. Then a bright golden door appeared in thin air, swinging open. Harry saw a flash of energy as they were pulled through.

It felt as if every bone of his body was shuddering within. He couldn't understand why he was becoming so weak, until he realized that it was the energy of trying to stay awake and focused in this place that was draining him. He just wanted to go to sleep…

"No! You're slipping away!" said Riku, but Harry couldn't hear him. He felt the pressure of his fingers lessen, and then he released. He spun, faster and faster, away from Riku. Then he escaped the energy force, falling into a never-ending chasm of shadow…

Sora paced the chamber again, swinging his keyblade aimlessly. "There has to be a way out…" he said. "Don't you just have some sort of spell you can use on it, Donald?"

"I don't know any spells like that," Donald said. He ruffled his feathers regally. "Can't you do something with that Keyblade?"

Sora struck out at the door, sending sparks flying through the dungeon. "Nope," he muttered.

"Well, don't give up hope," chuckled Goofy. "I mean, where there's a will there's always a way, h-yuck!"

"I don't see how we're ever going to get out of this," Sora said with a sigh. "We've been here a week already."

"We have not!" said Donald. "It's been exactly five days and twenty-two hours!"

"Yeah, well how do you see us getting out?" Sora replied.

The truth was, none of them knew, and it wasn't for lack of trying that they didn't. Donald had used every sort of spell he knew to try and open that door. "…can turn the lot of you into fish and can't open a single door…" he was heard muttering once. Sora had used every attack he knew on the door, and Goofy had used up all his strength bashing the locks with his shield.

"It's no use," said Sora again. "We'd need somebody like Merlin to help us out now…"

And with that a giant hole ripped itself in the middle of the room. Everybody jumped back. Sora, used to the occasional heartless attack, readied his keyblade, but it was not a heartless that appeared. It was, to Sora's surprise, a tall and thin teenager about his age, wearing a long black robe. He had on glasses (things which he had only ever seen the old magician wear up to this point) and his hair was messy and black. Strangest of all, in the middle of his forehead he had a scar that resembled the shape of a lightning bolt.

The boy stood up slowly, stumbling slightly. Then, to Sora's shock, he whipped out a wooden wand. "Who are you?" he said groggily, although there was obvious clarity behind it.

"Who are you, is more like it," said Sora defensively.

"Hey, that's a wand like Merlin's!" Donald rushed forward, causing Harry to shout loudly and crash backwards into the wall. "What the heck is this thing?" he shouted.

Donald began sputtering. "Uh-oh!" said another creature Harry had only just noticed, a sort of walking, talking dog.

"A…a…thing?!" The duck brandished a long staff at the boy's head. "I'll show you!"

"Expelliarmus!" Harry said. The duck was lifted off the ground for a moment as its staff flew into the boy's outstretched hands.

"Whoa!" Sora said. "That was awesome!"

"Are you a muggle?" Harry said suspiciously, looking hard at the only normal looking thing in the room.

"I don't know what a muggle is," Sora said, "but you're a magician aren't you!"

"I'm a wizard," Harry said slowly.

"Wizard?" Sora shrugged. "Whatever you want to call yourself, I guess," he said. "As for me, I'm the Keyblade Master. My name is Sora, and these are my friends, Donald and Goofy." The dog and duck both nodded at Sora, albeit the duck did so somewhat reluctantly. "Hey, you think you can get us out of here?" Sora said suddenly.

But Harry was trying to be certain he had heard what he thought he heard. "Keyblade Master? Sora?" he stepped forward quickly. "Do you know two people who also have Keyblades…or…well, I guess what you call that thing you have there."

"What? Two people?" Sora frowned. "I knew of another to have one, once, and the King has one too…"

"These people I met, the ones who brought me into this world…one of them was named Riku…"

At this statement all three of his companions jumped. "Riku?" Sora said quickly. "You saw Riku? Was he okay? Did he say anything about me? Where is your world anyway, do you think we could get there?"

"My world…something happened to it…"

Sora's face fell. "It was taken," he said slowly.

Goofy and Donald nodded along, obviously understanding more than Harry did. Then Goofy brightened up. "How about who he was with, h-yuck?" Goofy said. "Was he short? Did he have…erm…red pants?"

Harry didn't know whether to laugh or not. "Red…pants?" he said slowly.

"King Mickey! Was it him?" Donald said quickly.

"N-no! It was this other guy, with weird yellowish eyes. The Riku person called him Ansem…"

Sora exhaled loudly, striking his Keyblade on the wall. "Ansem!" he said. "I knew he would turn up sooner or later!"

"He created the heartless," Goofy said in a quiet aside. "We thought that Sora destroyed him, but…well, it seems like he's still around."

"Did he put you here?" Harry asked.

Sora suddenly looked thoughtful, though a hint of anger still lingered on his face. "Actually, we got here same as you. Through that hole thing. We think it's some sort of transport or something. We don't even know what world we're in."

"Yeah, we've been living off my rations for nearly a week," said Donald sadly. "We're running out of crackers."

Something about the way the duck said crackers nearly made Harry laugh aloud, but he suppressed the urge.

"Do you think you could unlock it?" Sora asked.

"Well…I can try," said Harry. He edged near and prayed quietly that it wasn't locked magically. "Alohomora!" he muttered.

With a faint click, the door swung slowly open. Sora and the two others cheered. Then Donald grabbed the staff Harry still held away from him. "I'll be needing that, thank you very much," he said.

They started out the door, and then Sora turned quickly. "Hey…what did you say your name was?"

"Harry," he said, "Harry Potter."

"Harry, would you like to join us for a while? If your world was really taken, you probably have some friends or family to find. Plus, we could always use a little extra magic power!"

"Yeah, I guess," Harry said, thinking suddenly of Ron and Hermione. "But…before we go…just one thing…"

"Yeah?" Sora was looking at him expectantly.

"Have you ever heard of…Voldemort?"

Sora simply shook his head, and it seemed odd to Harry not to get the knee-jerk reaction he was used to. "No. What about him?"

"He's really…bad. I'd be willing to bet he was somehow behind all of this stuff." Harry said.

"I doubt it," Sora says, "nobody is worse than Ansem."

Harry was still for a moment, contemplating just how strange everything was at that moment. "Let's go," he said quickly.

They emerged from the dungeons, not knowing what world to expect.

A/N: Hey guys! I hope you like the story! It's pretty cool, at least I think so, and I hope you like it too. Drop me a line to tell me what you think, and if you request it I'll be happy to R&R you in return. Thanks a lot for you time, see you later!