I've toyed with the thought that Newt's Patronus must be a dragon, but seeing dragon as his daemon is so much better. I love so many things in your fic - obviously daemon being a dragon, Newt's mind feeling like a forest, Jacob's reaction to seeing Newt's daemon...
Hmmm... I wonder - is the name Argotera taken from Greek?
Anyway... Truly enjoyed reading this, very nicely done. Kudos!