Each World can have up to 10 different Factions, each vying for control of its World. That done, the dominant Faction can then spread its influence, eventually (perhaps) becoming the Ruler of All Worlds...
Though mostly window-dressing in the Locked version, Registered players can, after building a stronghold, participate in this struggle for control of Mythos.
Players can see the relative stengths of the different factions by click on the Factions Button (see Interface)...Once your Stronghold is built go sit in your throne for your Strategy options...