Hee, if you're looking for some plot, I can help you out, by giving you an idea. I remember having a dream(?) about something similar, two actually, but one of them was about the lands being connected, so I probably won't tell you about it.
Anyways, in the dream, each island (12 or 13) has an element -- the element affects the environment, what creatures live there, and the inhabitant's hair color, and maybe temperament (Ex. Red = Fire & is emotional, e.g getting angry easily, hot-blooded, etc).
The protagonist was summon by a tribe with near transparent hair -- pretty much depending on where they are, they can use the elements available there, and their hair color is the color of that element. Reason he was summon was because they're pretty much weaklings in an uber-leveled area -- something caused the monsters to become that high, or they kept losing warriors due to all the assaults or w/e, and now they're pretty much in isolation (one village with a barrier around it), and depending on you to help them; by gaining knowledge about the elements from each island, recruiting people, and delivering supplies, such as food, equipment, etc. How you do this is... I think it was teleporting? or was it you're invincible so you can just walk/ride/whatever to each land?
And that's about all I can really remember, or care to talk about. You can use bits of this exert if you want.
Ps. The other one was pretty much; Each area is represented by a race, and you're suppose to try and conquer the other areas, or something like that
