Revived

I played. I killed Duncan, and on the next turn, he's standing there again. I killed him again. I captured his castle. The quest wasn't marked as completed.

I think I understand what's happening. You probably killed him, the script for his resurrection started, and then you captured the castle, but he hadn't resurrected yet.

Wait a couple of days; he should respawn near the tavern one last time, and then kill him. I'll fix this in the next version. I'll just put him directly in the tavern, in the castle.

Did you get the sword after capturing the castle?

You can get to the other side by either building a Mage Guild in your castle to learn the spell to summon a ship, or by trading with the prophet on the meadow for levitation boots in exchange for a bag of gold.

Just in case, I'll ask (just to check from the outside if everything else is working)

What week is the game currently in? Have Erathial and Glen arrived? Did you resurrect Stefan? Was Schultz there?