[Ammit]

While Armageddon does meet most of your requirements...

this example can theoretically happen, but clans in Armageddon tend to be fairly powerful and so its extremely difficult. Although off the top of my head I can think of many instances that players have effected the world. Either from the small or to the large.

Also Armageddon is currently going through an end of the world story-arc, which has let us give players a much greater influence over the game.