Added after 20 hours and 40 minutes
I completed the fourth mission of the single-player campaign in three months. Well, the author is quite inventive. I haven't had such difficult and exhausting battles in a long time, especially against the three heavily armored Key Guardians. I had to first send a secondary hero with a leveled-up "Spell Lore" skill against them. He significantly thinned out their troops with "Berserk" and ran away. Then, the main hero, the mage Cyrus (level 29), joined the battle and finished them off, and the weakest one was killed by the hero Alex (level 27). The elf hero Alaron remained at level 1 – he spent the whole game in the castle, which actually made the game easier for me. The barbarian with meat was very useful at the beginning. This allowed the mage to relatively quickly acquire "Spell Lore". The mentor is in the right place. Overall, despite the terrible battles, I didn't like the map. As in the previous two missions, the enemy is static and quietly awaits its fate. But if he were more active, for example, making sorties, the game would be much more interesting, in my opinion. Well, each to their own. I'll finish the fifth mission and write (I think the game has no castles, which is a pity).