Рыцарь Бездны
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It's probably easier to do it through the editor, but it can also be done through scripts. And to be able to do it through scripts, you need to at least understand the basics and do something simple. There are manuals available. There is also a journal: "Heroes' Herald".
http://www.woggrad.ru/ru/vestnik-heroes.html
Here is such a journal. In the latest issues, it describes how to create a simple quest, etc.
