A/N: In which there's the proper introduction of my theory of Elemental magic! I've written this part a couple of ways, and I believe I've picked the one that's the clearest. Hope you find it interesting. =)

Reply to a Guest review: I got the term hitsuzen from xXxHolic, yes, but I've always been a firm believer in the fact that everything happens for a specific reason.

Warnings: Yes, this is a crossover. However, you do not need to know anything at all about Yuugiou/Yu-Gi-Oh. All that needs to be explained will be. If you do know about Yu-Gi-Oh, you'll just have a sight advantage.

The companion fiction to this is Divided in the Darkness, United in the Light, told from the Yuugiou characters' point of views. But, as I said, there is no need to read that story or know anything about Yuugiou in order to understand what's happening in this fiction. I do encourage that you do read it, though, if you want the full experience of the universe I've created.

Disclaimer: I don't own Harry Potter or Yuugiou/Yu-Gi-Oh. Keiichi and Kiseki are mine, though. No stealing!

If Only You Knew

Written by Fenikkusu

Chapter 7: Discere (To Learn)

A few hours of bed rest later, Vincent felt well enough to walk around. Kiseki discharged him with a clean bill of health bar the depletion of his magical core.

She led Vincent to the door of her rooms. "I'll want to see you here in a few days to gauge your progress. Now you better not use your magic!" the Healer twittered, wagging a finger at him. "And if you really have to, please be attentive to how much you use. I don't want to have to meet you again unconscious."

"I'll try my best," Vincent replied with a small smile. "Thanks for all of your help!"

The Japanese woman smiled back. She placed a lily-white hand on Vincent's temple. A spark of white caused the smile to fade slightly. "Don't be a stranger, Vincent. I have a feeling that we'll be working together sooner rather than later, but as I said earlier, if you ever need anyone to rant to, you know where my rooms are." Kiseki scanned the halls with golden eyes. She leaned in and whispered in his ear, "Password is sanare, Latin for 'to heal'." The woman pulled back with a wink. "Now off to class with you!"

Vincent couldn't help but pause and look back at the portrait of the golden-haired woman once Kiseki had disappeared behind the door. The woman raised an eyebrow as she saw him staring. "Is there something you wish to ask?" the portrait inquired.

"She told me that she used to go here," Vincent began, turning around completely. "But how come I've never heard about her? And I've never seen your portrait either, miss."

The blonde smiled at him much the same way that Kiseki did. The two of them did look oddly similar, save for a few differences. Crystalline eyes regarded Vincent with curiosity. "I take no offense, if that's what you're thinking," the portrait started, "I'm Felicity. A pleasure to make your acquaintance, Mister Evans."

"Same to you."

"You see, Kiseki is a distant relation of mine," Felicity continued. She smoothed out the wrinkles in her simple white dress. "Give or take a few centuries. The students used to comment upon our appearances all of the time. As for why you've never heard of her specifically… well, she never really did look for the attention. Unlike Gryffindors, Slytherins tend to keep to themselves, no?"

"Wait, she was a Slytherin?" Harry knew better now; Slytherin wasn't completely filled with liars and cowards… but Kiseki Tamiya a Slytherin? It didn't compute. Granted that he only learned about her in the few hours she sat next to him and explained the current situation…

A raised eyebrow and a nod. "Why, yes. She and the Headmaster were close friends, although she's three years younger than him. Kindred souls often seek each other out."

Speaking of the Headmaster… Vincent turned to the gargoyles guarding the Headmaster's office. Everything seemed just a bit too quiet. A quick Tempus told Vincent it was a quarter to four. By the time I'm done with class, it'll be time for that meeting. I wonder what he wants to talk about. Although Vincent had a pretty good idea, he refused to believe it. Instead, he nodded to Felicity and turned toward the Defense classroom.

"Vincent!" Amun called out from behind him. He jogged to catch up to the other Slytherin. "Thank Ra you are all right. Had anything happened to you…" He took deep breaths, looking just as exhausted as Vincent. There was something different about the Darkness Elemental, though, as if a life-changing event had occurred while they were separated. "I apologize for my transgression."

Vincent waved his hands in front of him. "Don't apologize! I learned a lot from that. Got to meet the new Muggle Studies professor because of it."

Amun's mouth turned up in the tiniest of smiles as they began to walk side by side. "Ah, yes. Tamiya-sensei is apprenticing her own students this year." Vincent couldn't help but notice the wistful look in the deep crimson eyes.

"Do you know who?"

He nodded. "You'll meet them in a day or two, I'm sure. They're busy with their own training at the moment."

"Is that why you're so happy?" As soon as Vincent said those words, Amun paused. Vincent winced when he realized what he just said. "Sorry, if it's a touch—"

"You are correct in that assumption," was the quiet answer. The smile grew only slightly. "You could say that I've been waiting for these students for quite some time now. One of them in particular." Amun shook his head, tri-colored hair flying from side to side. "But that is aside the point. I am infinitely glad that you are all right. Your aura is weaker than what it was yesterday, but otherwise you seem in perfect health." When they reached the closed door of the Defense Against the Dark Arts classroom, Amun crossed his arms and looked Vincent over. "You would make a fine Duelist."

"Duelist? Like fighting each other with spells, right?"

There was a deep, resonating chuckle. "I'm afraid that's not the type I'm speaking of. You'll find out in due time."

Vincent nearly pouted. What's with all of these secrets? Then again, everything about the Elementals seems to be shrouded in mystery.

"So the baka-ou couldn't open the door by himself? Pity," a deep voice commented. Vincent swirled around but saw no one.

Amun rolled his eyes. "Jumping to conclusions again, Akefia? Stop playing coward and step out of the Shadows. You're confusing him." At the succeeding silence, Amun sighed. He raised a tanned hand toward a particularly dense group of shadows in a nearby corner. A lazy wave dispersed them, revealing a teen who looked remarkably like Amun in many ways. They shared the narrowed eyes, high cheekbones, tone of their skin, and dark aura. He didn't wear the school uniform; instead a deep green shirt, jeans, and a black trenchcoat completed the outfit. Messy white hair spilled over the other student's shoulders.

He was so immersed in what happened that he didn't notice the two boys standing right in front of him. "Move it, new kid," one hissed as Vincent bumped into him. Before he knew what was happening, he was shoved into a nearby wall. He caught a glimpse of white hair as the mystery person walked away.

Vincent took a step backwards. "Y-you! You're the one who pushed me into the wall!"

Akefia rolled his eyes. "Aw, does the new snake have a boo-boo? Do you want me to kiss it to make it better?" he scoffed.

"A boo-boo? How old are you? Five?" Vincent countered.

It was then that Amun stepped between them, a hand held toward each of them. "That's enough, you two. Slytherin is a house united, remember that. Although Professor Snape is now the school's Headmaster, we shouldn't forget what he taught us, right Akefia?"

The albino made a sound of discontent and looked away. "Whatever."

Vincent blinked. "Wait a minute. Since Snape is the Headmaster, who's teaching Potions? I heard that he's one of the youngest Potion's Masters in the country…"

Amun chuckled. "Funny you should ask that question, Evans. Since not many of us made it into the NEWT level Potion's class due to the Headmaster's high expectations, we're being privately tutored by him. Assuming that you also made it into the class, there are about… four Slytherins in the class including yourself. You can conclude who the other three are."

If Akefia and Amun were also in that class, that left… "Malfoy?"

"Yes. He would be with us now, but he and the Headmaster have some important business to take care of. I do hope that you understand," Amun explained. He cast a quick Tempus and noted that class started in five minutes. "We have a combined session today with the Ravenclaws. Although they are book-smart, I cannot help but wonder why the majority of them never arrive to class on time…"

At the sound of footsteps down the hall, the three teenagers turned. Vincent's eyes widened as he saw a Ravenclaw Sixth-year skipping towards them. Once the blonde reached the door, she frowned. "The Jabberwocky didn't get to this door, did it?" she asked in an airy voice. The girl pouted and took a few steps back. "Oh, hey Amun, Akefia!"

Amun chuckled. "Good afternoon, Luna. Up to your usual antics?"

Luna cocked her head to the side. "Antics?"

Akefia snorted. "He's asking if you're delusional, idiot."

Vincent glared at the white-haired teen. "For your information, Jabberwockies are real. They're just not native to this region!" Thank goodness for the extra tutelage that Keiichi gave me about the subject.

There was a shrug. "I'd rather not waste my energy with you idiots. I'm out." In a swish of his trenchcoat, the Shadows engulfed him. A few seconds later, there was no sign of him.

Amun placed a hand on his forehead. "I apologize for my brother, Luna. You know how he gets when he's agitated."

The Ravenclaw waved him off. "It's quite all right. I'm used to it." Luna turned to look at Vincent. "You're Vincent Evans, right? Quite remarkable what you did in the Great Hall the other day. The school's still buzzing about it. An Elemental, and a Lightning one at that…!" She smiled. "I'm Luna Lovegood," she continued, holding out a hand.

Vincent linked grips with her. His eyes widened at the spark of magic between them. Luna seemed oblivious to his shock when she dropped their hands. A glance at Amun, and Vincent saw a smirk. Amun, seeing the question in Vincent's gaze, nodded.

"We'll speak about this later," Amun commented, nodding his head to the others who finally began walking down the hallway. "Our first concern is this door. Vincent, would you kindly perform the incantation from the other day?"

Hazel eyes blinked before realization appeared. "Oh! Okay," Vincent stuttered as he grabbed his wand and pointed it at the door. "Occulta magicae revelio!" Instead of dark purple runes, bright gold ones assaulted the door. They immediately dispersed, showing no curse. Vincent's eyebrows furrowed as he tried the other charms he had learned in previous years in order to detect hexes. None of them showed a positive result.

Vincent reached out to open the door but found it locked. "Alohomora!" The lock retreated, causing the door to swing open ominously. The darkness that greeted them was absolute, but this time Vincent knew these originated from the Realm of Shadows. He heard muttered Lumoses from beside him before lighting his own wand. Amun nodded him forward, Luna following right aside the transfer student. As for the rest of the students, they decided to crowd by the door.

Vincent couldn't blame them; the first time he encountered the Shadows, he was just as shocked. But where could Keiichi be? Taking a deep breath, he screamed, "Magister! Are you here?"

A deep chuckle was his answer. "Well done. Lux, veni! (Light, come!)" In an instant the darkness was dispersed by all of the high windows being thrown open. Warm autumn sunlight bathed the room, causing Vincent to sigh in relief. Keiichi sat atop the front desk, one leg crossed over the other. He clapped, once, twice. He smirked much the same way that Amun did. "In!" he barked to the students still outside. Immediately, they all rushed in.

Amun nodded to Vincent and Luna before taking a seat at the front. Vincent sat next to him. Luna motioned to the empty seat beside Vincent. "Can I sit here?" she asked.

"Sure," Vincent said, scooting his stool a bit closer to Amun's. He figured the extra seat next to Amun was being saved for Akefia… if he ever decided to show up.

Once everyone was settled, Keiichi flicked a wrist. The door to the classroom slammed shut, making some of the students jump. "Welcome to Defense Against the Dark Arts," Keiichi began, sliding off of the desk. He bowed to all of the students. "I am Keiichi Sakurai, your professor for this year. Headmaster Snape and I are veterans of the First Wizarding War and participants in the second. He has personally appointed me to the position considering what occurred last year."

Keiichi pulled off the glove on his left hand and unbuttoned the cuff of the crimson shirt. A few folds later, Keiichi bared his left forearm to the class. It was unblemished. "As you can obviously see, I am no Death Eater, so shred that thought right now. The Headmaster and I are close… comrades." In a few swift movements, the sleeve was pulled down and glove replaced. "I do, however, also hold the position of Head Disciplinarian alongside Professor Tamiya… which means, if you receive any detentions, you are to report to either her or me." Keiichi simpered, and Vincent swore he saw a semblance of a fang. "And I assure you all that my detentions are not… pretty." He chuckled at the shivers which ran through the bodies of the students. "Any questions?"

Luna raised her hand. "Professor, why do you wear that blindfold?"

"Ah, I figured one of you would ask. My eyes are quite sensitive to light, so they must be covered at all times. However, I do not need my eyes in order to see. This is a skill which, if you all put your full effort into this class, you will learn within the month." Keiichi tightened the knot at the back of the silk. "All creatures with sight rely on the sense far too much for their own good. Once night falls, they are easy prey for predators. Any other questions?"

Pansy Parkinson asked, "Are you related to Amun and Akefia? You look and act the same way."

A nod. "Yes, I am their uncle. I am the brother of their late mother, and therefore I am their acting guardian until they come of age later this year. I have time for one more inquiry before we truly begin."

Vincent timidly raised his hand. "I guess you heard what happened in the Great Hall during the Opening Feast… Could you explain it for us?"

Everything was silent for a few minutes. "Evans, come here," Keiichi finally said after a few seconds. As Vincent stood, the professor continued. "Vincent was a recent discipulus of mine. From what I have heard, he displayed a great deal of power."

Vincent ducked his head as he stood next to Keiichi. "Sorry, sir…"

"I did not ask for an apology. Draw your wand." Without another thought, Vincent did. Keiichi waved a hand, conjuring some flammable material. A flick sent it to the far side of the room, where there was only stone. "Repeat what you did the previous morn."

"Operstitium fulmen!" A stream of lighting burst from the end of his wand, striking the material. It immediately set on fire.

The DADA professor banished the flaming mess. "Observations, class?"

Luna spoke, "It wasn't as powerful as the one from yesterday."

"Why do you believe that, Miss Lovegood?"

She paused for a few moments to think. "The wand?"

A nod. "Five points to Ravenclaw. Now, Vincent… resheath your wand. I want you to use your full strength."

Hazel eyes widened. "F-full strength? Sir, is that—"

Keiichi glared. "You should not worry about such trivial matters." The tone of his voice left no room for argument. "I will make sure that no one is hurt."

Vincent gulped. "Whatever you say, magister." He put his wand back into its holster and took a deep breath. Lightning gathered in his open palm, and after a few seconds he repeated the incantation. "Operstitium fulmen!" The force of the lighting caused Vincent to take a step back. The bolt struck the wood, sending flaming splinters across the room. This is what I was afraid of!

However, Keiichi was true to his word. "Protego," he said nonchalantly. The material bounced off the shield he erected in front of the entire class. An aguamenti doused the flames. The newest Slytherin breathed a sigh of relief. He shook out his right hand; it still tingled with the raw power of his Element. Vincent sat back down, oblivious to the stares from the non-Elementals in the room.

"What you witnessed yesterday is what Elementals call an Impulse. Those who have little to no control over their abilities have them more often than not," the professor explained. "Vincent most likely had an… emotional reaction to the Unforgivable yesterday. I can assure you all that Headmaster Snape is making a smooth recovery."

Emotional? Vincent wondered with a frown. Is that what it was? He shook his head as a wave of dizziness passed over him. Professor Tamiya is gonna have my head…

Syllabi were passed out. "Thus begins our theory on Elemental magic. Turn your texts to page ten." There was a swish of pages.

"Evans?" Amun asked, placing a hand on his arm. "Evans, are you all right?"

Vincent slumped to the floor, unconscious.