I gave it a thought after watching the finale, wondered how "dark" Merlin really could go - and it intrigued me .. a lot. I also wished that
Gaius died in the finale so we could see Merlin go a bit darker with grief in season 2 or something.
And I stumbled upon this little gem on youtube today:
Click to view
and absolutely love it ^^
and now I'm starting to crave for me dark!merlin