You are watching: When does morgana find out about merlin
Morgana to learn of Merlin being the mage only in the third to last episode (Season 5, illustration 11, The illustration of the Dark). Mordred tells she at the end of that episode who Emrys is (aka Merlin).
Morgana and Arthur never meet up again after the (or rather, when they meet, Arthur has actually learned already that Merlin offers magic).
You could be mixing up Emrys and Merlin? Morganna knew that Emrys was a an effective Warlock and wanted him dead, return she to be afraid come tangle with him directly.
She go not know that Merlin to be Emrys till it was also late for the details to have any effect.
It is because Morgana underestimate two things: Merlin himself and his relationship with Arthur. She is born and raised a noble woman. Morgana as displayed previously on the serie the she does not really take into consideration the servants on the lengthy term. With Gwen for example: one day she wants to conserve her, the following kill her, and then she doesn"t treatment anymore. Uther mirrors the same form of behaviour toward Gaius: one day he is a precious help, sooner or later he have to be burned, the next he is an ally, another he is prepared for retirement...
It is not because Morgana go not know that Merlin has magic. She does as beforehand as season 4. In S04E06 "A servant of 2 masters", she tells Melin:
I haven"t checked out you because you condemned my sister to a slow and painful death.
So she does know that Morgause"s magical wound was reason by Merlin. He even ask her to "tell come Arthur" due to the fact that he admits in front of her that:
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At the point, Morgana may not accomplish Arthur himself, yet she has actually an influence on the court via Agravain. Castle are even framing Gaius for treason, which he hasn"t done. They could have disclose Merlin for magic, however they don"t also think about it.