The cover art for each expansion has had a large image of the main protaginist in the centre. Reaper, Lord of Darkness & Ice Queen. So the large eagle is the eagle king. IMO.
Hopefully as a highland expansion you will be able to find some haggis, or use a set of magical bagpipes to scare away enemies with terrible wailing. Possibly a loch on the lower levels that will reveal a monster on the roll of a 1? The blurb did mention a magical river that could be hiding some kind of beastie.




