This is just a small story I thought of because of the approaching Season 5 episode 3 of Merlin where we get some ghost action. I couldn't stop myself my mind went automatically to Supernatural. After failing to find a crossover fic that suited what I imagined I decided THE HECK WITH IT IM GONNA WRITE ONE MYSELF. And so I did.

Basically thought of this whole story while at work so I've been filling in the blanks. Hopefully shouldn't be that long cause I don't have a lot of time to devote to writing while I'm at school. But if at least one person likes it then I will be happy I guess.

Just fyi. No slash. I prefer Arthur and Merlin's Friendship above all else. So just profound bonds all around okay?

Oh well, enjoy!

-C

…..

Chapter 1: The Book

"So explain this to me…one more time." Dean said starring at the ancient book he held gingerly in his hands. He was forcing himself only to breathe through his mouth, in fear of sneezing and obliterating the leathery tome. The thing was practically turning to dust in front of his eyes as is.

"In order for this spell to be…effective," Castiel sighed pausing to look up at his human charge with emotionless eyes. He was a patient man, or angel in truth, but sometimes even he could feel it thinning. Days like now, when he found himself in the frequent company of the hunters, Sam and Dean Winchester. "In order to be effective, this spell requires a magical conduit. The spell, currently scribbled onto the pages of that ancient text was created by one of the most brilliant minds ever to exist." He returned his gaze downward at the circle that he had just finished etching into the cement floor, examining it one last time. It had to be perfect, he keep chanting to himself. He had studied the book and its notes for days and paid close attention to the warnings scribbled on the brittle pages. One wrong angle or missed spelled word could prove to be catastrophic.

"Okay that much I think I understand." Sam said reaching out and carefully taking the ancient book from his brother, fearing the reckless man would destroy it. "So all we need to really do is make a kind of ultimate-hex bag, right? That will conduct the spell and we then can call forth this…this uh weapon?"

"Yes." Castiel straightened up and watched the two brothers, and he felt a great weight drop in his chest. It took him a moment to comprehend the feeling; never had he really felt the power of time before meeting these two men. He had lived for countless centuries, doing the bidding of his father and brothers never questioning anything. But now…His life had slowed down to a pace he was not familiar with. Ever since taking the vessel of Jimmy Novak…

He snapped out of his thoughts and returned to the present. "Yes, but it is not that simple."

"Whenever is it?" Dean cursed rubbing his hands on his pants leg trying to get the layers of dust and dirt off.

Castiel nodded. "The spell, from what I understand it, will have to come in two parts. First we must summon the ingredients for the 'hex bag'. This spell was never meant to be done by anyone but the owner of that book, so we will require a piece of that person to be able to conjure the second spell at all."

"Okay, so like a reliquary? A bone or some kind of physical…" The younger Winchester said, still focused on the words on a certain page before his head snapped up. "Wait, why can't you just zap back in time and grab it yourself? Doesn't this sound a bit, oh I don't know unnecessary?"

"No, Sam. I cannot travel that far back without a key."

"A…Key?" Dean scoffed. "Since when do Angels need keys to time travel?"

Castiel shook his head, neither offended nor amused by him. "I traveled as far back as I am allowed just to attain that book. Any further, without assistance would not only damage my vessel beyond repair, but wrought unknown havoc upon the time stream. It is much safer to do it this way."

"Ah well when you put it in that perspective huh," Dean smirked coming to stand next to the angel, jokingly shoving his shoulder. "Don't want you to go a ruin that pretty face now do we?"

"No Dean. There are still great risks. Neither one of you are really up to par with the magical ability it will require to do just this." Castiel made an effort to get the seriousness across to the man. This was no laughing matter. "If we are to stop Crowley for good, we need this weapon." Sighing the angel went to stand in the circle, he reached into his trench coat, pulling out a bowl filled with the necessary ingredients and placing it at the exact center.

"I will need some of your hair Dean." Castiel said holding out a hand to the oldest brother. Dean looked taken aback.

"Why me? Sam's the one with all the luscious locks, I'm sure he's got some to spare."

"No. It has to be you. What we exchange must be somewhat equal in value to what we hope to obtain. That way we stay away from dark magic, and our intentions remain good." He watched as the blond man reached for his pocket knife and sheared off a small handful of hair from the top of his head, his hand still out –stretched.

"I still don't understand why it has to be me, I'm not that special." Dean grumbled.

"You were the first seal in the apocalypse, a righteous man arisen from hell by God's own command to walk the earth once more. The intended vessel for the arch-angel Michael, the Michaels Sword, and do not forget that without your constant resistance the world we know would be no more. Do not scorn your importance Dean, not ever." The two starred each other down, green eyes meeting blue. After a long slightly uncomfortable moment Dean sighed placing the few strands in the angel's hand before sulking away to check the building's security once more.

Castiel looked to Sam, sensing his insecurities without having to ask. "It is not that you are not righteous or worthy, Sam. But there is a dark power deep within you left over from Azazel, no matter how much you ignore it and it will always remain. To play it safe, we will use Dean."

Sam let his shoulders fall, only now realizing that he had been holding his breath. He nodded, still worried. He moved out of the circle handing the book to Castiel as he passed. "I don't think you actually mentioned the owner of this book, Cas. I couldn't find a name written anywhere. Whose hairs are we exchanging for Dean's to make the hex bag?" Sam asked once Dean returned to his side.

Flipping through the pages absent mindedly Castiel sighed, "Merlin Ambrosius, Royal Advisor to Arthur Pendragon King of ancient Camelot."

AN:Edit