Questions about the Heroes 4 map editor.

Well, that's easier than shelling peas.
Each castle has a dungeon with a hero of the same race. So you can play as whoever you want.

But why have a hypothetical starting castle – it's unclear. It would give a big advantage to those who choose the same race.

Moreover, I would make it so that each player only has, for example, 10 fairies at the start (for scouting the map). And the castle would be transferred via script.