Note, i'm using colored text to implement spoiler tags. Highlight to see it all.
Anyway, Cloak of Illusion seems to be stuck. I found it odd when I got defiance early before going to get the cloak. I got the cloak, the shield, and the quest is still running and I can find all three dwarves, whom have no dialog related to the shield, but I can't find where Finnu went. He does not appear to be at Brass Horn's Cave. I don't recall finding him there to begin with, so i searched all over inside, all over outside, around the far border, no dice. I feel like probably found him elsewhere, but I can't even find where that elsewhere is, and the quest description says I should find him at Brass Horn's Cave.
Next we have the Rescue Freda quest. Not solved, not failed, not active, and the Shaman of Stonley's castle isn't talking about it. I figure it's a catch-22, because I gave her the money to take off the moment i got to the holy island and found her, so i believe i completed the quest prior to starting it, and now starting is impossible. Did i loose anything worth while?
And lastly, here in the old tunnels, there seems to be some hidden enemies where i marked them in green. I don't know if they're guarding anything important, either.
EDIT: Deleted one, 'cause i found the hidden passage. If you're seeing the above, they're still unaddressed if not below.