Whatever we do I'd advise against something that isolates either east or West. One of the things that's always made Dwilight an exciting and dynamic place to play was its central sea. If we want to push the realms in a certain direction I suggest towards the center. Perhaps we could make all lands along the coast of the central sea a temporary "safe" zone. Or if that's too many regions maybe just the cities and strongholds. That could create an interesting element reminiscent of Roman and Greek colonies.
Perhaps for the sake of player engagement we could make it possible for adventurers to create a buffer zone. Like if they hunt often enough in a certain region not only will rogue groups not form there but rogues from outside will avoid the region.
