Rexsar
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I have no idea where it comes from. I haven't experienced this myself. The only script related to a town only works when the town is captured, not during the AI's turn. Does the console work? Maybe something is reflected there before the game crashes?
Could it be another consequence of the same issue that occurred with the creatures from the dwelling? Did the demon castle survive? I'll check the script to see what might be wrong.
Yes, the demon castle is still there.
No, I launched the console. Initially, some gibberish is displayed there. When I press the "end turn" button, nothing happens in the console; the game simply crashes.