Grover’s Expedition

2. Regarding the Bishop, please explain in more detail, because I don't understand: is he strong, or does he just run away after the victory?
3. Angel Wings? Where did you find them? In Utopia, you can't find anything, only after the quest can you get the Sandals of the Saint. I'll fix the bug with the underground.
4. The Titans and Colossi that you find will need to be upgraded in the fortress.

The battle with the Bishop unfolded as follows:
He had 3 Archangels, 20 Monks, 60 Archers, and 60 Crossbowmen (Warriors). That is, he wasn't very strong. For several rounds, this meant: 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 the victory, he walked away on his own. (Apparently, that's how it was intended)

Regarding the Angel Wings: you can enter the Dragon Utopia several times. After the victory, a certain set of artifacts would drop. One time, the wings were among them.

On the map, there are 6 Tier 6 creatures + 2 Tier 5 creatures. Still not 10. That's the first thing. Secondly, again, I don't know what it's connected to, but the upgrade for the Thunderers is blocked. There's an old mod for NPCs.