Back to the animals. Don't forget about day/night as well. There are nocturnal animals as well as diurnal animals. That could add some diversity as well. Some of the areas are already themed to represent some of the things we might see on certain terrains, like Bir for instance. Maybe in the deep south of the world map, where there aren't any areas (other than Ash? Is that south?) we could have Ents or some king of magical creatures that don't necessitate armour, but that could still be higher level. This could be a scenario where the populated areas forced some of the other creatures to go further south. It would also force people to explore the world map and maybe even make such a huge map somewhat useful.