​Adventuring Aids: Universes

There are many universes within this multiverse, and many multiverses within the ultra-multiverse.

All universes within the same multiverse usually have similar physical laws, and mass/energy in one universe will attract mass/energy in the other universes. Different multiverses usually have quite different physical laws.

Each universe has it’s own time differential and space differential. Our universe’s time differential is 45. Our space differential is 60. Time and space pass differently in different universes. The time ratio and space ratio are the respective differentials, divided by each other. If you travel to a universe with a time differential of 15 and a space differential of 40, the time ratio between there and here is 3, and the space differential is 3/2. So, if you spend 20 minutes there, you’ll return here 60 minutes later (20 times 3 is 60). And if you walk 4 kilometers there, you’ll return 6 kilometers from where you started here (4 times 3/2 is 6).