User blog comment:Aithusa07/List of Plotholes from Merlin/@comment-32920116-20170822062432

Morgana is a high priestess of the old religion, but she can't figure out that Emrys is standing 5 feet away from her. Ok, I'll buy that...but couldn't Morgeause have told her that Merlin has magic?? Given that Gaius and Merlin both blasted Morgeause in the throne room at Camelot and that Morgeause STILL managed to travel with Morgana all the way to the Isle of the Blessed before dying (which we know is many days away from Camelot), they certainly had plenty of time to have that conversation! "Uhm, sister--you might want to keep an eye on that Merlin fellow, being that he's a bit of a sorcerer who used magic to mortally wound me and stuff..." And then Morgana could have put two and two together.

Beyond that... it's not really a plot hole but a bone of contention: as much as I loved Merlin, the tragic iron is that he was basically responsible for Arthur's early death. If he had been honest with Morgana and told her that he had magic when she was scared and vulnerable, she never would have needed to turn to Morgeause. If he had built a friendship with Mordred and built on a decent but confused kid's inherent desire to do the right thing, Mordred might have developed loyalty. Facing Merlin's narrow eyed suspicion at every turn, Mordred was eventually worn down and succumbed to evil.

And finally: for God's sake, man: WHY did you go traipsing through the woods with a badly injured Arthur instead of calling the dragon?? No, he wasn't a horse, but desperate times called for desperate measures! I'll never understand that one.

Merlin was a great, great character, and I love the job Colin Morgan did. But Arthur dying was not "destiny": it was a self-fulfilling prophecy. :(