Hello! This is my first crossover fanfiction and my first Harry Potter fanfiction so don't expect perfection. I wrote this on a whim and made it take place during the 6th book of Harry Potter, the very one I usually have trouble with remembering all the details, but oh well. Hopefully this doesn't end in flames.

Quick thing I have to say, during the opening ceremony thing I copied some things Dumbledore said from the books from his opening speech, because it seemed really dumb to change it. But as the story goes things will go more AU and I won't copy the books, it was just easier this time so I don't have to make up the whole opening speach.

Disclaimer: I don't own Merlin or Harry Potter. The god BBC and the absolute goddess JK Rowling are to thank.

Chapter One:

Harry

Harry beamed as rolling fields of grass flew quickly past the windows in the compartment of the Hogwarts Express. He was finally heading back to the school of witchcraft and Wizardry, and all seemed right with the world.

Well, if you exclude the fact his scar had never ceased to stop stinging for the past half year. Voldemort was back, and the whole wizarding community knew and feared it. Natural disasters that certainly were not natural had been happening all over Europe, people mysteriously are found dead, or not found at all, and to make matters worse, Muggles were starting to suspect there is something more going on. Something unexplainable. Something magic.

And thinking about Harry's problems, he remembered what happened at Diagon Alley a few weeks ago. Draco. He just had this to be working with Voldemort now. The way he flinched when he was being tailored for new robes by his arm or when he snuck off to some creepy voodoo store to ask about how to fix something was proof enough. He rolled his eyes at the fact that no one believed him that Draco was now a death eater. Not even his closest friends.

He rubbed his scar unconsciously as he stared out the windows. He was so absorbed in his thoughts that he hadn't noticed a red headed freckled boy and a buck toothed curly haired girl walk into the compartment.

"Harry, we're almost to Hogwarts, you better go and get your robes on."

Harry jumped and looked at Hermione who smirked and sat down on the other side of the bespeckled boy, dressed already in her robes, a prefect badge shining beautifully pinned to it. Ron grinned widely and sat down to the prodigy witch, dressed in his own robes, yet his badge he kept in his pocket because of the relentless teasing from the red head's brother the year before.

Harry smiled at them and grabbed his robes, before walking out to get changed, Ron spoke up.

"Guess what Harry," he said with an excited look.

Before Harry could ask what, Hermione spoke up. "It's just a rumor Ron, no need to go making a big deal about it."

Harry lifted an eyebrow and sat back down. "Now I really want to know," he said with curiosity leaking into his expression. Anything Hermione thought was annoying or unnecessary was defiantly just the opposite to the two boys.

Ron smirked triumphantly and Hermione rolled her eyes. "As our female friend said, there's a rumor going around," he said with a glint of excitement. Harry urged him on with an enthusiastic nod of the head. So Ron continued. "They say Professor Binns quit."

Harry had to use all of his willpower to not cheer or gasp. Professor Binns was the most boring teacher in the history of ever, how ironic it is that the professor teaches History of Magic. They say the man died in his armchair, never realized it, and continued teaching. The ghost had taught his class for as long as anyone could remember and every lesson was dull and painfully hard to stay awake in. "What would cause him to quit?" He asked in awe.

"Apparently he realized he had died and decided to go towards the light, or something like that," Ron smiled.

Hermione rolled her eyes. "I doubt the rumors are true. I mean, that man loved his job so much he continued even after death, I don't see why he would quit just like that."

"Maybe since he realized he was dead, that his lessons were dead boring as well," Harry said with a grin. "And I hope the rumors are true, can you imagine a history lesson we're not falling asleep in?"

"Maybe the teacher could tell us more exciting parts of history other than the Goblin rebellions," Ron said leaning back into the chair with a hopeful expression.

"Well, it's not like either of you will get into History Of Magic this year, both of you got failing results in the O.W.L's," Hermione added in.

Ron rolled his eyes. "That rich considering you got O's on everything except Defence Against the Dark Arts."

Hermione shot him a glare. "Anyway, Harry, you better go get dressed," Hermione said, closing the conversation.

Harry glared at her then left through the sliding compartment door without another word.

He walked down the skinny hallway and only stopped when someone ran into him from the behind. Harry fell to the floor and the man fell of top of him while ungodly amounts of papers scattered everywhere. Harry groaned.

"Oh my gosh I'm so sorry," came a deep yet youthful Irish accented voice. The man quickly scrambled off of Harry and proceeded to gather all the scattered papers with a wave of a pear wood wand.

Harry lifted himself to his feet and looked at the stranger with curiosity, though it was hard to because the man was suddenly holding a stack of papers nearly touching the roof of the compartment. But thankfully the man peeked his head through the mountain of papers to study his victim. He had black hair that sat in a slight mess on his head. His face was filled with youth but his blue eyes were filled with age. Harry wondered how such a man who could hardly be older than 25 could look at Harry with eyes filled with enough wisdom to rival Dumbledore himself.

"You're Harry Potter!" He said with wide blue eyes. Harry instinctively lifted his hand to his scar which caused the man to chuckle. Harry only nodded, already used to people calling his name without him telling it. The man smirked. "Of course I've heard a lot about you, bit of a trouble maker the past six years I hear."

Harry rolled his eyes and annoyance filled him. "That's because of I'm the Chosen One apparently. Everyone expects me to suddenly defeat Voldemort."

"Ah yes, Voldemort has been causing a huge ruckus lately, him being back and all," the man sighed sadly, as if he completely understood what Harry was saying.

Harry looked at the man in shock. Not only had he not yelped or screamed at the name of the Dark Lord, but he said it himself! Harry instantly knew this stranger was definitely not a normal person.

The man noticed Harry's shock and laughed. "Now Harry, it's not like saying his name is a sin. Now if you excuse me, I must be off. I will see you at the opening ceremony." He then nodded then walked away from Harry with his stack of papers wobbling to and fro, held up only by magic.

The Boy Who Lived was about to call after the raven haired man before he saw a bleach blonde boy slip into a different compartment. Draco Malfoy. Harry smirked, Draco was sure to talk to his posse about his recent joinings to the Death Eaters. He reached in his pocket and grabbed his cloak of invisibility and snuck to the compartment the boy disappeared into, completely forgetting about the strange man.

Merlin

Merlin sat at the head table between a greasy haired man and a giant - who had arrived late for some reason. He certainly felt very awkward being in the castle of Hogwarts and even more so when students began filing into the Great Hall. He shifted uncomfortably when many students dressed in various colored robes shot curious looks at the warlock and at another man further down the table whome was having an enthusiastic conversation with Albus Dumbledore.

Merlin glanced at the table full of red robed students called the Gryffindors. He was slightly disappointed when he didn't catch sight of the lightning scarred wonder. Out of everything he had been excited with when he got a teaching job at Hogwarts, meeting the Chosen One was by far the one he looked forward to most. A boy that had his destiny thrust upon him, forced to defeat terrible evils, and unknowingly possesses more magic than any witch or wizard of his time. Harry reminded Merlin so much of himself that he could barely contain his excitement when he ran into the boy in the express. But now that he wasn't here, he wondered what could possibly be holding the boy up.

The greasy haired man stood up suddenly making Merlin jump. He watched with curiosity as he walked to the headmaster and exchanged a few hurriedly whispered words before flicking his back robe and then scurried off out of the hall. Before Merlin could do anything, a stern looking witch burst into the hall with a line of first years with various expressions of fear and curiosity behind her as she carried a stool with a old worn out and tattered hat on it. The warlock smiled fondly at the hat remembering the time he himself was sat underneath it. A few centuries after Arthur's death Merlin magically made himself 11 again to learn modern day magic and… well… that is a story for another time.

The first years were sorted and the Dumbledore announced that it was time to eat. Merlin could hardly suppress his joy when food magically appeared on every table. How far magic had come!

It was at the very end of the meal that a certain bloodied up black haired boy strutted into the Great Hall. Merlin recognized him instantly as Harry Potter, and so did the rest of the room. The boys face was covered with blood and he wasn't even in his robes. Merlin saw him blush slightly at the attention of the hall, but strided confidently and came to a stop next to a curly haired girl and a red haired boy who started to whisper quietly to each other. The girl waved her wand and cleaned up Harry's face then tried to pry out where the boy had been. It looked like Harry didn't want to talk, looking around him suspiciously looking like that wherever he had been, he didn't want to tell in front of unwanted ears.

At this time the black haired man strided into the Hall and sat back down next to Merlin.

Harry reached for some food only to pull his hand back when dinner was replaced with desert. He sighed then grabbed some treacle tart, then continued in a discussion with his friends. After a few minutes of talking Harry looked up at the staff table and waved at the giant next to the warlock, before his gaze stopped on Merlin. Recognition flared in Harry's eyes, then suspicion. He voiced a question at Hermione as Merlin waved with a grin.

Suddenly, Dumbledore stood up with his arms raised. The whole hall died into a shocked silence at the sight of his right hand. Blackened and dead looking. Merlin lifted an eyebrow but Dumbledore brushed off the sudden questions of his injured hand.

Merlin hardly paid attention to the old wizards speech as he studied Harry and his friends who were talking urgently with each other. But he was pulled back to the opening speech when Dumbledore finished announcing the new objects banned from the castle caretaker and Quidditch tryouts.

"We are pleased to welcome two new staff members this year. Professor Slughorn" -a bald and fat stubby looking guy stood up and beamed down at the students- "is a former colleague of mine who has agreed to resume his old post of Potions master."

"Potions?"

"Potions?"

Merlin was surprised when the word was echoed through the Hall as if no one believed it. What was so surprising about a new Potions master?

"Professor Snape, meanwhile," said Dumbledore, raising his voice so it carried over all the mutterings, "will be taking over the position of Defence Against the Dark Arts teacher."

"No!" Yelled Harry in disbelief louder than he probably intended. Merlin noted his horror as well as the rest of the Halls terrified expression while the Slytherins pumped their fists and high-fived each other. He concluded that Snape was not a very well liked Professor.

Snape, the greasy haired man, clearly didn't want to stand up like Slughorn at the mention of his name, so instead just waved his hand with boredom painted on his face.

Dumbledore cleared his throat which stopped all confused conversations. Once it was silent, he continued. "Now, our second new teacher" -he moved his hand to Merlin who stood up with a sheepish grin- "Is Professor Emrys who will be filling in for Professor Binns in his absence."

Merlin gave a friendly wave while people looked at him with shock. Clearly the students were not prepared for three position changes, and if anything, they were most surprised by the History of Magic teacher who was so dull and boring would be replaced by a younger looking man who had the aura of fun all around him.

"Where did Professor Binns go?" Asked a Ravenclaw with confusion chiseled on her young face. She stared at Merlin with a mixture of shock and awe.

Dumbledore chuckled. "it seems he has business on the other side of the vail." He didn't go more into it. He just motioned Merlin to sit down and then continued with his speech with a voice that he was not interested in more questions about the staff change. "Now, as everybody in this Hall knows, Lord Voldemort and his followers are once more at large and gaining in strength."

A few studies jumped at the name, even a few teachers flinched but Merlin just sighed sadly. Once again, magic had corrupted the heart of a powerful person. Voldemort wasn't the first and he regrettably won't be the last. He shook his head as he had almost thought of the old days and Morgana. Time had healed him plenty, but it still hurt him and he didn't want to be depressed the day before his new job.

"I cannot emphasize strongly enough how dangerous the present situation is," Dumbledore continued, knocking Merlin out if his thoughts, "and how much care each of us at Hogwarts must take to ensure that we remain safe. The castle's magical fortification have been strengthened over the summer, we are protected in new and more powerful ways, but we must still guard scrupulously against carelessness and the part of any student restrictions that your teachers might impose on you, however irksome you mind find them - in particular, the rule that you are not to be out of bed after hours. I implore you, should you notice anything strange or suspicious within or outside the castle, to report it to a member of staff immediately. I trust you to conduct yourselves, always, with the utmost regard for your own and others' safety."

Dumbledore's eyes swept over the students before he smiled. "But now, you're beds await, as warm and comfortable as you could possibly wish, and I know that your top priority is to be well rested for your lessons tomorrow. Let us therefore say good night. Pip pip!"

Merlin grinned at the leaving crowd of students and stood up himself to head to his chamb... room. Honestly, one thing he hated about modern day times is that no one called their rooms chambers anymore. So many things has changed in the many years he had wandered the earth awaiting the return of Arthur. He shook his head then proceeded on his way, nodding happily to those that acknowledged him as he went. He smiled, tomorrow would be busy, he had to fill the empty role of a teacher that had taught for years. He had to meet new people and teach about the past that no one knew that he experienced himself.

And proceed in his real reason for teaching at Hogwarts. Voldemort is back in power and affecting innocent lives. And it is time he got involved.

Yay! With that done I can sleep. Please please please make sure you review! REVIEWING INFORMS ME OF HOW MUCH YOU GUYS ENJOYED READING AND LIFTS MY MOTIVATION, WHICH WILL CAUSE ME TO UPDATE MORE OFTEN.

The reason I made this is because I recently finished Merlin a week ago, and I can't help but laugh every time someone in HP or Fantastic Beasts says "Merlin's Beard!" And i just imagine Merlin awkwardly shifting.

Now, I must go-