Heleg
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The map is designed for five players from the very beginning to the very end. It's hard to imagine how much would need to be reworked to make it suitable for only one player. But if I finish what I started about 2 months ago and then abandoned, it will have exactly what you need.
a map with one castle per faction and one hero, so you can leisurely explore while enjoying a glass of beer, developing at a relaxed pace, rather than rushing around like crazy, because otherwise you won't have time.