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Set after series 5 for Merlin and after The Battle of Hogwarts for Harry Potter when Harry and everyone is back at school to 'redo' their final year. Merlin being bored and with the war over decides to check out the damage done to Hogwarts by becoming a teacher. Slight AU because Gwaine lived, cause he's awesome!
Merlin Returns
Chapter 1: The Return of Dragoon the Great
If anybody had been checking this particular section of the road that led to Hogwarts School of Witchcraft and Wizardry they would have noticed a boy, a young man really by all appearances with a thoughtful expression that if one looked closely would have noticed his eyes that betrayed a lifetime of knowledge, an amount only seen in recent years by the former headmaster of the school Albus Dumbledore, sharing a similar mischievous look in his eyes.
Ahhh Hogwarts back again, those stupid death eaters better have not completely destroyed the school after all the work I put into helping those wand-wavers build it thought Merlin as he was walking down the path towards the school in question shaking his head and laughing under his breath. Stepping behind a tree before he got in sight of the school he said "Miht dagan, beþecce me. Adeadaþ þisne gast min freondum ond min feondum" transforming himself to look like an eighty year old may Dragoon the Great is back, though I may have to bring in my "grandson" to do some snooping later. Oh well if there's trouble it will find me.
Sighing when he reached the gates and seeing the Aurors, who were no doubt good at their job but after a little over a thousand years he still thought it funny when those who did not know who he was thought of him as weak and that they could defeat him haha if only they knew he thought giving his head a slight shake missed by those guarding the gate.
"Hello! I'm the new Defense Against the Dark Arts teacher. Dragoon Emrys. Here's my letter of introduction. Now be a good boy and open the gates don't want to keep an old man waiting now do you?" he croaked out remembering a situation with the knights where he had to use a similar tone of voice laughing to himself he thought at least I won't have to knock them out and use them as a ladder! Gwaine never let me live that down.
Slightly confused the aurors let him in after reading the letter and showed him where the carriages were that were there to take the teachers and workers up to the castle before the term started. "Aww threastles, good beast those though with a terrible reputation." He said looking at the young man beside him who was his escort up to the castle. "Yeah though I expect some of the students to freak out when they get here tomorrow what with the battle and a bunch of them being here at the time. By the way my name Auror Jones." He said shaking his hand and the ride up to the castle was quite after that.
When the castle finally got into view Merlin could see that there had already been a great amount of work put into it and excepts for a few chunks of ground and some of the places where suites of amour set was now empty one could almost imagine that there had been no battle between good and evil but Merlin could sense the magical residue of the fight. Saying good-bye to his escort he made his way up the stairs to the castle he had not been to in years.