[MajinDragon]

How about just making islands beyond the five Kingdom's? which are full of monsters of different levels and experience yeilds. These islands would not have the normal towns we see around main, they should just be small outpost which the kingdom that the island is nearest to has control over (this does not mean other kingdom members can't come there, but if the other kingdom is an enemy to the controlling kingdom they can't enter the outpost). Beyond the outpost would be different types of terrain, depending on the island. Each island would have their own unique monsters and some similar. Some islands would be desert like, others jungles and some just the normal grassland.