I somehow got stuck with this map. I couldn't complete Arnold's quest – I didn't manage it within a month. And I didn't really understand what hat he was talking about. Is it the Helmet of Knowledge? Although, I just killed Arnold later. But now I've cleared the map, but I can't reach the red tent – it's guarded by 10,000 dragons. My hero is level 34. In general, I think I've reached a point where I can't handle these dragons anymore.

Added 1 minute ago
And also – I can't talk to the Druid Britt – it's some kind of bug. And also, some buildings are inaccessible.