What If? {Merlin}

What if someone else had been there in Camelot? What if they magic? What if they taught Arthur and Morgana that not all magic is bad? What if they keep it a secret from Merlin? What if this person helped Morgana with her magic? What if this person became Arthur's best friend? What if this person is the unknown factor in the lives of Camelot?
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(I do not own any of these characters other than Kylynn and Maeve. All rights go to whoever wrote this show)