Necropolis discussions.

I don't quite agree about luck, I prefer to level up Enlightenment to Mentorship and then there's a lot of it.

In a long game, hero retraining often happens. We start with one, level up Mentorship, and use it to create a foundation for another combat hero for the endgame (teaching spells), and then we can level up Luck for him. Large and long maps are generally difficult to play with just one hero.