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Well, it could work just like monsters spawning in tibia. Probably "spawner" object, with objects in inventory, and values of how often new object is created, what is the randomn range from the spawner object, in which object can apear. Also, how many of created objects must be on map for spawner to stop creating new objects.

This way spawner with range=5, food=3, time=180 and 2 goblins and orc in inventory would be creating new monster (66% goblin, 33% orc) up to 5 tiles away, each 3 minutes, and would stop creating monsters after reaching 3 created monsters. Of course it should continue creating monsters, after someone kills some or all of them.

Just my proposition.