I really don't like it when they give you two heroes at once. It's just confusing; you don't know if you have enough resources on the map to develop both, who to prioritize, and who will be carrying the team in the third mission (a level 18 hero who cleared the map or a level 3 hero who was stuck in the castle). Why is this the case in all scenarios/campaigns?
It would be so simple to give a small hint – for example, Sandro could tell Markel to go collect resources, while he fixes the walls.
P.S. The first mission went smoothly; I even cleared the second garrison for extra resources.
In the second mission, it's probably better to send Markel on expeditions; even though he's an apprentice, his specialization hints that he should be collecting resources through leadership. But then you think about the fact that Sandro is the main hero, his avatar is the priority, he has upgraded troops, and more spells.
So you just sit at the beginning of the mission, scratching your head. That's what I'm talking about.
P.S.S. And by the way, I don't believe in coincidences – although anything is possible)) I went with Markel, and I found the Summoning book right near a peasant on the coast (the others had money and a flesh tunic, which was also good). I'm sure that user Katangens, who found the Book of Darkness, was playing with Sandro.
The Cloak of Silana was in the cart near the genie, and I bought the Book of Darkness in the shop.
And yes... I almost forgot... the cartographer doesn't reveal the map, but it wasn't really necessary – I have money to spend, so I just checked and reloaded.