Random Monsters Map Patcher – diverse neutral armies.

Here is an example of a template file.

	
		
			CREATURE_MARBLE_GARGOYLE
			1
		
		
			CREATURE_GREMLIN_SABOTEUR
			2
		
	
	1887
	12580

As you can see, the types of creatures are specified separately. That is, each combination requires a separate file. :(
The disadvantage of RMG is that, although it places groups of creatures, they are not random in the sense that they do not change if you start playing this map again.