For example, it is mentioned that Rutger was captured by Greystone and imprisoned in a dungeon.

I would also look there, but the wizard's hut revealed the dungeon. That's why I was in a hurry to free him, so that Rutger wouldn't be interrogated.
By the way, my wizard's hut shows the area around the dungeon three times (from slightly different angles). Was that intentional?
The fifth installment of the series instilled a strong reflex: if there is a gatekeeper's outpost, you won't be able to access the area behind it without a similar tent. It is probably necessary to get rid of this narrow-minded approach (and your map contributes to this), but small hints would be helpful. For example: "despite the rubble, refugees from the Greystone area somehow get here... and so on (this could also explain the joining troops)."



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