Rock of Grimheim

This is the second-to-last wave. They are usually defeated with Summoning, but I suspect that the randomness of behavior, initiative, and morale can be very favorable to the AI and not at all favorable to the player. As for Giovanni... you can try blinding the celestial warriors with vampires. Of course, provided that they don't have vampirism from the opponent's hero. If I remember correctly, the hero with darkness goes there on one side.

I killed Jessica on the 150th attempt (probably a combination of 100 factors of luck made it possible), and I even managed to get a resurrection so that it would be without losses. Godric turned out to be even tougher. After about 100 attempts, I found the right strategy to defeat him, but even then, it didn't quite work out. I lost all the archers from the second and third stacks, and it's unclear how to repel the next attack, which will probably be even tougher, without archers.