These swarms of bosses attack in a mob of 100. This may be incredibly intimidating at first, especially since most likely the characters are weak from the stage before it. However, take note of the fact that they can be Frozen. Thus, the strategy for this boss fight boils down to sitting in a corner, while a Magician with Permafrost freezes parts of the swarm constantly, while other ranged characters deal damage to them. When the bosses start to get close, quickly throw the characters to the other side of the screen and repeat the process. Each boss has an astronomical 9999 gold drop, meaning it's possible to make a lot of money in this stage (If reviving isn't used at all in the stage before it).