Yep, that's right folks, new story, and my first attempt at a crossover. It is Harry Potter/Buffy the Vampire Slayer story. It is canon up until Order of the Phoenix and is set at the beginning of season three of BTVS. The story will run in canon with season three until branching of and going AU after the season finishes. So, without further ado, read it, and review it to let me know what you think.

CHAPTER ONE: The Best Laid Plans.

The air was thick with magic. There were shouts and screams echoing through the room, screams of people fighting and dying. Inside the ministry atrium, hundreds of witches and wizards were colliding in an epic battle. Half were dressed in black robes with white masks, the other half were dressed in different colours, they didn't need to be colour coordinated, they all knew they were working together.

Harry Potter raised a shield against a flurry of attacks that came his way. Flashes of red, blue and purple lights crashed against Harry's gold shield, the shield did not budge though and instead absorbed the curses. None of those curses were deadly, only meant to harm on incapacitate him. The Death Eaters had orders not to kill Harry because that was supposed to be Voldemort's job. Harry was under no such obligation though and slashed downwards with his wand. A bright red flame appeared and charged toward three Death Eaters standing in front of him, turning all three into ashes. Harry winced slightly at the gruesome sight but had to shake it off quickly as another barrage of spells came toward him. Harry, not having enough time to bring up a shield, dived to the ground to avoid them. He was careful roll onto his front because he had a bag on his back that contained something that he couldn't break, something that would help him defeat Voldemort. From the floor, he cast a silent trip jinx at the feet of the Death Eater that had been attacking him. He then cast a silent stunner at the floor, catching the Death Eater unawares.

Harry jumped back to his feet, still in battle mode he immediately had to spin out the way of two more curses. Unfortunately, he span right into a yellow light. The spell hit him on his shoulder and Harry hissed in pain as the curse cut him deep in his right shoulder. The Death Eater that had thrown the curse raised his wand again, but before he could, a green light appeared from behind him and struck the Death Eater in his chest. Harry turned to see Remus Lupin standing behind him with his wand out.

"HARRY!" Remus yelled, "GET TO THE LIFT!"

Harry simply nodded and held onto his injured arm as he made his way to the ministry lift on the other end of the room. Remus walked behind Harry, covering him by keeping up a strong golden shield. No Death Eaters dared using a killing curse so close to the Chosen One, none of them wanted to feel the wrath of the Dark Lord. Harry got to the elevator, which conveniently was already open, and stumbled in; he was losing a dangerous amount of blood. Remus followed him in and slammed down on the button which closed the door. Luckily for the two, the doors were magically enforced as they heard several curses crash against the door.

"Let me have a look at that…" Remus began, grabbing Harry's arm. Harry pushed him away and took a step back.

"Don't bother Remus," Harry said, "It's dark magic, you're not going to be able to heal it."

"Harry, you're about to face Voldemort, you can't fight with that injury," Remus said, Harry just threw him a look which said, no shit Sherlock, Remus shook his head and continued, "What are you going to do?"

Harry sighed and with one sharp tug, he pulled off the sleeve of the black shirt he was wearing before wrapping it around his wound. "Just going to have to make do,"

"Harry, as I just said, you're about to duel Voldemort," Remus said seriously, "You can't just make do and expect to survive."

"If all goes according to plan there won't be much duelling involved." Harry replied. He pulled the bag of his back and opened it. He pulled out three circular metal discs. All three had jagged edges and fit together like a puzzle. Carefully, Harry began to piece them together.

"I would feel so much better if you would activate that thing from here," Remus commented,

"No," Harry said instantly, "It has to be done close to Voldemort."

Remus just looked at the device Harry was holding with distrust, "Do you really think that will work against him Harry?" he asked slowly, "I mean…it does seem very…muggle…"

Harry didn't even look up and continued to put the machine together, "Not everything muggle is useless Remus. Believe me when I say this device is going to save the wizarding world."

"You didn't answer my question Harry,"

"I've tested it before," Harry explained, "It worked against all wizards and witches and most magical creatures, I can't see…"

"Harry!" Remus interrupted, "You're not answering my question." Harry sighed and finished putting together the device before standing up and finally looking Remus in the eye. "Will it work against Voldemort?"

Harry stared the man, his mentor in the eye, and realised that he couldn't lie to him. "I don't know."

Remus mouth hung open, "How can you not know?!"

"Voldemort's magic is different," Harry explained, "It's darker, more powerful than other witch or wizard on this earth, including me," Harry looked up at Remus with a grim look on his face, "I can't be sure if this device will work or not."

"So you're basing this whole plan on something you're not even sure you will work?" Remus questioned once more, just to be sure.

"It's way to late in the game to change the plan now Remus," Harry stated, "It will work, trust me."

"And if it doesn't?"

"Then I do what I always do," Harry replied, he saw Remus questioning look he added, "Wing it," Harry grinned and opened up his palm and produced a red flame. During the last two years his magic had changed and evolved. It was only when Voldemort attacked Hogsmeade and killed hundreds of innocent people he exploded in anger and set everything around him alight. After discovering his new ability he had spent all his time learning to control his new found ability and try to find out its limits. While he now had a decent amount of control of his power, he was still unsure of it's limits so he rarely used it in a fight, maybe now he would have too.

Remus groaned, "Harry you're going to be the death of me one day."

"Let's hope its one day a good few years from now," Harry replied with a grin before returning to his serious look, "He's in the Department of Mysteries."

"Are you sure?"

"Yeah," Harry grinned, "My Voldemort detector says so,"

Remus shook his head and pressed the button on the lift. The elevator gave a lurch before it began to fall downwards. After a few seconds, the elevator stopped and the door opened, revealing the Department of Mysteries. Harry's thoughts immediately turned to Sirius, his dead godfather. He was now able to remember him fondly though, and not feel as much guilt as before. He learned that he had to move on in life, and as hard as that was at first, he realized that it was what Sirius would want more than anything.

"There's a good chance I'm not going to get out of this alive Remus," Harry said suddenly, Remus opened his mouth to object but Harry quickly stopped him, "Don't Remus, if I don't come out of this alive I'm going to need to you to pass on a message to Ron, Neville and Ginny. Tell them…tell them I said thank you...for everything…and make sure you put flowers on Hermione's grave for me every year, it's the least I can do for her."

"Harry…" Remus began, Harry looked back up at him and it looked like his face had aged twenty years in twenty seconds. Harry held up a hand, stopping him from continuing.

"Go back up to the battle Remus," Harry ordered, "This is something I need to do alone."

"Harry…" Remus began.

"No, Remus, just go," Harry stated again, "If he see's you, the first thing he's going to do is kill you. He won't kill me straight away, he would want to taunt me about my death first," Harry explained,

"But Harry…" Remus started again,

"Remus just go," Harry demanded again, his temper beginning to get the better of him, "There's going to be enough death today for me to deal with without having yours on my conscious as well."

Remus didn't look happy, far from, but he respected Harry's decision and knew that Harry was capable of protecting himself. "Be careful Harry," he advised. Harry just nodded and stepped out of the elevator, hearing the door slam shut behind him, Harry kept walking without looking back.

Harry walked in silence for about five minutes, past the brain room and the room which held the veil. Harry didn't know where he was going, but his scar did. Unlike last time Voldemort used the connection between him and Harry, Harry knew he wasn't being ticked. Voldemort knew that this was going to end tonight, and he would want to do it, one on one. Harry stopped in front of a door and pushed it open. The room was large and spacious, but empty. In the far end of the room, was a dark pulsating ball of magic, which seemed to be getting bigger every second. The entire thing just screamed of evil and darkness and was something Harry wanted to stay away from. Ironically, in front of it stood the Dark Lord Voldemort.

"I thought you weren't going to show up Harry," Voldemort hissed, "But then again, you wouldn't leave you're friends to die now, would you?" his red snake like eyes focuses on Harry.

"What's that?" Harry asked, ignoring Voldemort's greeting and attempts to wind him up.

"Never mind about that Harry," Voldemort sneered, "You won't be alive long enough to see it in action,"

"Why? Are you going to kill me?" Harry questioned with a smirk, "Because we both know you're track record with trying to do that."

Voldemort's eyes flashed in anger and before Harry could react, he raised his wand and hissed, "Crucio." The red light hit Harry in his chest and Harry crumpled onto the floor in pain as he felt like a thousand hot knives pierced his skin at once. Harry was stubborn though, and didn't make a noise; instead he drew blood from his own lip as he bit down on it too hard. Voldemort lifted the spell and laughed at him.

Harry sat up and spat the blood out of his mouth. "Do you see now Harry, that you're destiny, the prophecy, was drawing you here, to die, here, by my hand? Do you see now Harry? You never had a chance of beating me, you will never, be powerful enough to defeat me. You are weak Potter…" To Voldemort's surprise, Harry began to laugh. "You find something funny, Potter?"

"Yes actually, I do," Harry grinned as he coughed and stood up. He picked up the metallic device that had fallen to the ground and waved it in front of his face. "You see this; this is going to be the downfall of the greatest dark lord in a centaury."

Voldemort sneered, "Is that really how you hope to defeat me Potter. A simple muggle device?"

Harry continued to grin. "Let's see what happens." He pressed the button. Both Voldemort and Harry paused and waited for something to happen, nothing did.

Voldemort laughed darkly, "Is that it Potter?"

"Let's find out shall we," Harry announced as he dropped the device on the floor, "I have no wand in my hand, I can't protect myself, why don't you kill me?"

Voldemort hesitated, before deciding that if Harry wanted death, who was he not to give it to him? He raised his wand with a triumphant look in his eye; he had been waiting seventeen years to do this. "Avada Kerdava." Voldemort waited for the sickly green light of death to come soaring out his wand, but it never did. "Avada Kerdava." Voldemort repeated, but again, no curse came. "Avada Kerdava. Avada Kerdava. AVADA KERDAVA!" Voldemort looked up and glared at Harry, who was just grinning smugly at the most powerful dark lord of all time. "What did you do Potter?"

Harry's grin suddenly disappeared and he narrowed his eyes. "I made you weak." Voldemort's eyes widened as Harry disappeared from where he was standing and appeared right in front of Voldemort. Before the Dark Lord could do anything to stop him, Harry pulled back his arm and punched Voldemort in his jaw. The punch was strong, stronger than it should it be and sent the Dark Lord flying into the wall. "You don't know how long I've been waiting to do that."

Voldemort coughed and spat blood from his mouth. Harry smile grew even wider when he saw how pathetic the Dark Lord was. "If you're wondering how I managed to move so fast and hit you so hard, let me remind you of a famous line I once heard, the power the Dark Lord knows not,"

"Love," Voldemort coughed from the floor, "The old fool said it was love."

"The late, and great I might add, Albus Dumbledore, was wrong," Harry explained, he watched as Voldemort fought his way back to his feet. "You see, the prophecy was misinterpreted, it wasn't power, it was more like powers. Sure, love may have been one of them, but you see, during the last two years my magic has changed and evolved. My own magic has, woven, into my body, making me much stronger and faster than a normal wizard. I did always wonder why my reflexes were so quick…"

"AVADA KERDAVA! AVADA KERDAVA!" Voldemort yelled suddenly, pointing his wand at Harry, once again, no spell came out.

"Did anyone ever tell you that you're rubbish with that curse?" Harry questioned rhetorically.

Voldemort continued to glare at Harry, "What did you do?"

"I used this device, handy little things a couple of muggles created, it blocks all magic from being used in a five mile radius," Harry explained, he smiled at Voldemort's look of horror and hatred, "And right about now, about a hundred muggle SAS officers are going to storm into the ministry and arrest, and if they have too, kill any Death Eater they find. Who ever said muggles were weak and useless."

Voldemort's eyes went red with rage as he pulled a small knife out of his robes and charged at Harry. Magically, Voldemort was a lot better than Harry was, but in hand to hand combat, Voldemort wasn't a match for him. Harry had been training, with several martial arts professors, for the last two years and because of his enhanced strength and speed, he found himself to be quite the expert, because of this, he easily blocked Voldemort's attack before kneeing him in his stomach and pushing him back down to the floor.

"You rely too much on magic Tom," Harry commented while using his foot to roll Voldemort over onto his back, "It's made you over confident and arrogant." Harry put his foot on Voldemort's chest and grinned, wishing he had a camera for that exact moment. Voldemort surprised Harry though by grabbing Harry's foot and twisting it sharply, causing Harry to fall to the ground. Voldemort's eyes immediately locked onto the device Harry had brought with him and began to get to his feet with every intention of trying to destroy the device. Harry was quicker though and grabbed onto Voldemort's ankle and from his hand, he produced a bright hot flame. Voldemort hissed in pain as he quickly put it out but before the Dark Lord could move any more, he found a silver sword pressed against his neck.

"Do you like my sword?" Harry asked as he clutched the golden handle tightly. "It's mine you know, made specially by goblins, I call it the Sword of Potter." He paused slightly, "I know, the name needs work." The device, which had fallen on the floor, began beeping loudly, signalling there was magic in the room. "What the…" Harry looked behind Voldemort to see the big ball of magic had returned, but this time it was larger and more deadly than before. "What is that?" Harry questioned, when Voldemort just smirked, Harry pressed the blade tighter against his neck.

"I always win Potter," Voldemort hissed after a few moments of silence, "The magic in that ball isn't just any type of magic, its blood magic. In another few minutes, it will keep growing in size until it consumes the ministry, then the whole of London, it will not stop growing until it destroys everything in its path, and I'm the only one who can stop it." Voldemort began laughing hysterically, "I always win Potter, I always wi…" Harry plunged the sword into Voldemort's stomach. Voldemort dropped to his knees and knowing how hard it usually is to kill of Voldemort, he lifted the sword up into the air and swung it downwards, slicing Voldemort's head clean off.

"Not this time Tom," Harry whispered, standing over the dead body of the Dark Lord. Harry flicked his wrist and the sword disappeared in thin air. The sword was imbued with Harry's own magic, so he could call on it whenever he needed and make it disappear whenever he wanted. Goblins were geniuses when it came to making weapons.

His eyes turned back to the ball of magic that was growing and growing. Harry guessed the ball was too strong for the muggle device and stopped it from working. Harry approached it, it looked like Voldemort really was going to win, the ball was pulsating and fizzy with energy, it practically screamed evil. Harry reached out, trying to touch it, but instead his hand went straight through the ball. Harry pulled it back out in shock and stepped backwards. To his surprise, the ball decreased in size.

"Blood magic," Harry whispered, Voldemort had said it was blood magic. "He took some of my blood!" he realized with a start, that night almost three years ago when Voldemort was reborn using Harry's blood could prove to be a good thing. The ball had turned smaller when he put his hand in, meaning Harry could stop probably stop it. He pulled out his want and whispered a spell to try and contain the ball. Nothing happened. Harry realized quickly that the device was still working, meaning there was nothing he could do to stop it. The ball grew larger once more at a faster rate, until it covered half the room. There was only one more thing Harry could do.

"Guess what Tom, you don't win." Harry muttered, before he stepped into the ball of magic, in a last ditch attempt to stop it from destroying everything.

Later, Harry would only remember one thing about the experience.

It hurt.

000

So that's the first chapter over, the second will follow shortly. Let me know what you think guys, reviews mean everything to authors!