Board Thread:Spoilers!/@comment-24674051-20150609161411/@comment-26225812-20150611115639

ChocolatEyes613 wrote: I was thinking that Morgan Le Fay might be Merlin's daughter, and that is why she chose to become the first Dark One. The casting call described Merlin, as "someone who has always put duty in front of his own desires, even at great personal cost." Wow !!! Amazing theory :)