Post-nuclear war. Go with a cross of Mad Max and Gamma World (Google it).
An alternate timeline where technology never advanced into the electronic age, or even into the internal combustion engine.
The New World was never discovered, and now the inhabitants of these unknown lands are invading the Known World.
Maybe make a Dark Sun MMO.
A Ringworld MMo.
An inter-planetary MMO (not EVE), but without starships and such. Use something like Stargates or portals to travel from one to the other. Expansions would be new planets added to the game world.
A word where Rome never weakened and fell.
An alternate timeline where technology never advanced into the electronic age, or even into the internal combustion engine.
The New World was never discovered, and now the inhabitants of these unknown lands are invading the Known World.
Maybe make a Dark Sun MMO.
A Ringworld MMo.
An inter-planetary MMO (not EVE), but without starships and such. Use something like Stargates or portals to travel from one to the other. Expansions would be new planets added to the game world.
A word where Rome never weakened and fell.