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I don't know, I don't know; Nicholas roamed wherever he pleased in my game. To be fair, there was a rather specific situation. The first time, I pitted phoenixes against him and naturally lost. Of course, after the victory (I wrote about how I defeated Nicholas's superior forces
here), he resurrected near one of his cities. After numerous victories, I managed to capture all Necropolis cities, but Nicholas still kept resurrecting. Then I replayed it so as not to make that mistake again, and the victory was even faster than I had planned. I was disappointed that I didn't get to properly develop my army in this mission.