But then again, you don't know that much.
From what you have written, it seems like you have moved into the room in formation, and Anna is checking the appropriate side of the pillar for niches and so on.
First - she finds a tiny square crack in the stonework and thinks that a stone panel could be prized loose, revealing a secret space inside the column. The panel is not very big (1x1), and not opened in a very long time.
Second - she spots some tiny runes running around the crack, and recognises these as the same magic language that Tiana has been pouring over in the spellbooks (the Salenish magic runes). She immediately averts her gaze, because she knows what happened to poor Wen back at the undertaker's house, when he tried to read runes which looks like that.
So - secret door and possible trap found. No major hobgoblin invasion so far.
