Walkthroughs for custom maps.

I didn't understand this either.

I have some thoughts on this. The strategy is the same as with one angel; in terms of losses, it should result in two fairies being lost. I can try to demonstrate it in a video.

Just to be clear, here's a Chinese-style explanation of the exploit.
I know that boosting a hero without units is a good and fast strategy, and that it can be done by hiding the hero in a castle and then dismissing a unit through the kingdom view. But in the HD mod, this seems to be fixed. However, it is definitely prohibited in the "house rules."
Later, I saw screenshots from a player showing that they had the Heroes executable file open, an internet browser, and Paint (or something similar) for taking screenshots. No Prospector, no HD+.