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Message: <blockquote data-quote="Jürgen Hubert" data-source="post: 1755013" data-attributes="member: 7177">You might take a page from the latest edition of GURPS - they have a setting ("Infinite Worlds") where a civilization (="modern-day Earth") has learned how to travel to parallel universes. They used this to explore different worlds and exploit the resources of uninhabited or thinly inhabited parallels.Then, sometime later, they made contact with another civilization that learned how to travel parallel worlds - and they are trying to rule the different worlds. Usually from behind the scenes, as they don't have the manpower to do it through brute force, but they can get pretty nasty when required."Infinite Worlds" has technological rather than magical plane-hopping (though it does have an evil, magical "Cabal" and psionic dimension-shifting Nazis), but you can steal ideas from it nonetheless.First of all, come up with a general cosmology: How fit the different worlds with each other? Some might be easily reachable from the next, while others are more difficult to reach - and others still impossible (you have to jump to one or more "intervening" worlds). Try to come up with some sort of "Shiftweb", where the relationships between the various worlds are explained.Second, come up with one or more dimension-travelling organisations or even civilizations - and why they are keeping the secrets of cheap dimension-travelling to themselves (if everbody did it, the impact on the various campaign worlds would be huge...). One might serve as the "good guys", while others will serve as the villains. Each of them has a different world as their "main base", and each of them has different motivations - and perhaps, means of travel.That should be enough to get you started. Now throw your PCs into the mix, and see what happens...   <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" /></blockquote>

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