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There's a bug. In the script, Orcs appear only if that creature is present in the hero's army, but in reality, they always appear, somehow ignoring the condition. (Sorry, I was digging through your scripts, I'm making a map myself and want to make it better:))
Added 11 minutes ago
Although, it's possible I misunderstood the script. Logically, only one unit should appear, but I get goblins/centaurs/orcish warriors appearing daily, and it doesn't matter what army I have (for a significant part of the time, it was an Elven army).
Added 3 minutes ago
Stop, I meant creating regions around the QUEST artifacts, not that I have problems with blockades. I'm talking about your solution to their theft. I suggested something like that.
P.S. And I might be wrong about the Orcs a hundred times.