I've seen this perk, it's on the ARMORER ANVIL!

To get to it, do you have to go through the light armor side? To get to the dragon's armor, do you have to go through both paths, creating light and heavy armor for all who come? I wish to eventually create the man who welcomed me into the Companions, suitable equipment if he can walk outside the Jormungrr house after he walked into it and looks at the door. (come with me, I will heal you) Also I watched this : http://www.youtube.com/watch?v=JthOwCjmGfE the cat and scale place.

But can I get the man in Skyforge gear, and shadow moves

You can go through either way to get to that perk. Once its unlocked both styles are available.