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I imagine Hanno is going to have his Choir judge Cat and find out that she really doesn't want to hurt Good, and from there is willing to continue the alliance against the Dead King.

I'm still wondering if the Dead King is the final boss or if they move to fighting the Bard directly at some point. The DK isn't actually that important except as the Sauron type threat; he doesn't represent the battle between Above and Below that Cat is trying to get rid of, and his motive in attacking everyone else is still unknown.