Board Thread:Questions and Answers/@comment-5621713-20121107190457

I am in the midst of watching the whole series for the fourth time( a little obsessed with it??) and was wondering if anyone knows why Morgana, and not Morgause, had to be killed inorder for the Knights of Medhir to be stopped? Morgause is the one who woke/summoned them, so why did Merlin need to kill Morgana and not Morgause, who is clearly a strong and powerful enough sorceress to do this on her own. And, by the way, why did she put Morgana to sleep, and return her to her bed as if she dreamed their meeting in the forest the night before. Morgana had pledged her support, why did Morgause need to set it up so that Morgana wasn't sure if she dreamt their meeting? 