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If you just need a dummy unit that always stays in the town, you can place it next to the town and use scripts to disable its AI and make it move to a point with the coordinates of the town (or the entrance to the town). I haven't tested it, but it should work.
Справедливость - авторский глобальный мод
ColouredText - список заклинаний и их уровень в описании существ-колдунов
ColouredText - список заклинаний и их уровень в описании существ-колдунов