Gez
First Post
I think I prefer the approach found in the Ultima games, especially in UW2: Labyrinth of Worlds -- the more alike two planes are, the easier the travel between them is. There are many symmetries possible -- symmetry of events, of geography, or populations, of languages, and so on -- and you can try to bring your plane closer to another by altering one of these possible symmetries.
Thus, say, creating a hellish realm could eventually open a portal to a diabolical world.
Thus, say, creating a hellish realm could eventually open a portal to a diabolical world.