Stuck here myself, how do you open the 2nt barrier? I tried the amulet, dosn't seem to be working.
There's a second barrier? What about the first?
Well, the Barrier after the boss.
Right, this one. There was also an ice elemental trapped at the northen part of the map, who apparently knew how to sneak inside the treasury, but I killed him with snowmen guards. Maybe there's a way to make him talk?
And also to the left of the room with Boreas there's a portal to a small room with a dead imp and a note about four statues, but it seems a dead end.
And on Steam there's a discussion about it as well:
http://steamcommunity.com/app/230230/discussions/0/45350244880967635/Someone mentioned a book called "Forgotten Language of the Faery" - it is sold by Victoria the librarian at Cyseal. Maybe someone can check this out?