User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/WORST plot hole in the HISTORY of 'Merlin'/@comment-4916403-20121014212601/@comment-4190137-20121017053230

Hi lurker. :)

Whether all druids have magic or not, Mordred was one of those apprentices who possessed magical abilities.

And besides, in Series 1 Gwen saw Mordred use magic and I would highly assume she'd tell Arthur.

I would say there is more evidence pointing towards Arthur formerly knowing that Mordred has magic. But I could be wrong.

Anyway, it's just a plot hole, it's not like they are going to base any episodes around Arthur discovering Mordred's magic so it would be something just to ignore. ;)