January 31, 2015 12:44 AM EST
We have a winner.
I'll explain it line for line,
Nestled in the mountains of the Dawn: was main used to give you two different options, you could guess about Dawnstar or Fort Dawnguard, or I guess the East in general as well.
Lies the home of the three sent to slay their formal foe: A defence to Nightingale Hall and them in general.
And shall cry the three: Refers to the Nightingale motto SHADOWS hide you.
for I am with them in stone: The Shadow Stone itself, this is a line basically meant to mean that the shadows are with you (as in close to you) in stone well that the stone part.