The universe is composed of many dimensions. The simplest view of these is as cables in a bundle. At the centre of the bundle is baseline, (0,0), the parties’s home. Each universe out from that diverges slightly at some point in the past.
First come historical changes: Japan invades Russia during WWII, preventing them from using Siberian troops against the Germans; WWII never happens as Hitler died in 1929, The Roman Republic managed civic reforms that prevented it from becoming an Imperial state; China discovered America and gains access to its natural resources during the middle ages; The Egyptian Empire avoids cultural and technological stagnation and still stands in the 22nd century. In a cable this is the thin strands of copper at the center.
Further out from that in the bundle metaphor lie worlds that diverged far enough back in time so as to have biological changes: Empires of Cat-people, dog-people, Civilizations of dolphins, lands where dinosaurs roam the earth. While there are many more of these dimensions then there are of the Historical dimensions there is much less known about them due to the fact they have been far less heavily explored. This would be the strands of rubber insulation around the copper.
Then you have the rubber coating of the cable: These are realms where things diverged back when the solar system or universe was forming. Earths locked in ice ages; earths backing in the sun; earths with CO2 atmospheres and whatnot all exist here. Very little is known about this region as exploring it is very dangerous for obvious reasons.
Beyond that lies Terra Incognita, the land unknown. This is the strange region that no one really understands. Almost no travellers have returned from here, and those that do report wildly varying laws of physics, worlds full of magic, worlds with psionic and stranger things. Most expeditions to this region have not returned, and it is thought this is because they traveled into areas in which dimensional travelling technology does not work, or areas where the laws of physics do not support the existence of human life. This is normally described as the area beyond the cable.
This is the basic outline of the universe my next campaign will take place in. I’ve given some of the ideas I am working off of before, but what with running this campaign very soon I thought it would help with the adventure to set things down on digital paper. I will freely admit that most of this is taken directly from Tangents, which is the backdrop of my campaign, but with my own ideas mixed in. I’ve started out with tangents as the base, which I’ve posted a summary of below, and then will spend latter posts documenting my divergence from this idea, including the problems with the cable model, the fuzzy nature of individual strands, tears in the universe and how to travel using them and what the Z-coordinate means.
Until Next TIme, Stay Geeky