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KycoK_3a6opa, it's quite possible that this is the case: even though the game was released 13 years ago, some attentive players sometimes manage to discover something in it that was previously unknown. If you have the time and desire, you can experiment yourself and then tell us about the results.
Added after 13 hours 39 minutes
I checked today, and it really turned out that the units that appear in the Pandora's Box directly depend on which Castle the area where the box is located belongs to!
Even if, for example, a Stronghold is located somewhere, but the soil type is Infernal, then the Pandora's Box will give units specifically from the Stronghold!
Stop hard - Go Pro!:smile49: