Board Thread:General Discussion/@comment-5621713-20121207092202/@comment-3325613-20121207133504

I guess it's really difficult to know since, apart from the "Old Emrys - Morgana confrontation" we saw in "A Servant of Two Masters", in which they only used stunning spells, they have never directly fought one against the other; and obviously that's because Merlin doesn't want to reveal his magic (or simply the writers don't want it yet).

Morgana's magic has grown a lot from Series 4 (let's just think of the ageing spell she held for at least four days, a thing Merlin himself finds terribly exhausting) and Merlin now does fear her.