The end of an Era has come. Magic is broken. New Heroes are needed to face the challenges of the new Age!
Note that Finn only has light fortification from the Heart of Earth/Water combo. So 25% chance to negate a critical.
Is Gnorton ordered to dispel the terrain illusion as part of his sentence? Or does it expire during the 11 months that passed?
If we have time between sessions, Finn will scry each assailant at the first opportunity - starting with the bladelord, woman, gnome, in that order.
While he never admits to having done it, it becomes apparent that he was the mastermind behind it being put in place. It does not expire during the 6 months he was in jail. The judge makes it clear to him during sentencing that any action that occurs that propagates a deception in the lands will result in Gnorton being brought in for questioning.