Walkthroughs for custom maps.

You can't attribute this to bad luck; the theory of probability doesn't allow it.

Actually, neither luck nor probability plays a role here. As I noticed (using the example of starting artifact drops), regardless of the settings in the editor, certain artifacts often drop repeatedly, while others don't drop at all.
In the fourth game, the situation is even worse when, during a level-up, only one unwanted skill drops (instead of one of four, according to the theory of probability).
In short, probability in Heroes differs from the generally accepted one. :D