AlekseyS
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The battle with the Bishop unfolded as follows:
He had 3 Archangels, 20 Monks, and 60 Archers and Crossbowmen (Warrior). So, not very strong. For several rounds, it went like this: I eliminate his troops, the battle ends, and it starts again. A total of 2 times.
He simply disappeared from the map when he died.
The last time, after winning, he walked away on his own. (Apparently, that's how it was intended)
Regarding the Angel Wings: you can enter the Dragon Utopia multiple times. After winning, a certain set of artifacts drops. Once, the wings were among them.
The map has 6 Towns + 2 Castles. Still not 10. That's the first thing. Secondly, again, I don't know why, the upgrade for Thunderbirds is blocked. There's an old mod for NPCs installed.
I just checked the battle with the Bishop, and it works fine for me. I don't know why it's happening for you.
The Dragon Utopia also works normally for me, and you can't start the battle again after winning.
I'll fix the issue with the Titans, but it's best not to use any mods.