In the otome game, Royal Nightmare, there are four dungeons in the third event.
The first one was the Dungeon of the North, where all the main characters gathered. With the Imperial Princess Estella, her imperial brother, Prince Ephraim and other characters, they were able to conquer the dungeon after thirty attacks.
The monster boss was a terrible and huge Blue Wolf that spit out ice.
The second dungeon was the Dungeon in the East, where the Holy Country was able to conquer it by defeating the Skeleton python that corroded anything with its breath. However, since in reality right now, with the East being destroyed, then perhaps after Ephraim was done with the North dungeon, he will take care of that.
The third dungeon in the West, a fire breathing huge red chameleon. With the Argens, they should be able to handle that as well.