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Message: <blockquote data-quote="Jürgen Hubert" data-source="post: 1449676" data-attributes="member: 7177">GURPS Time Travel has lots of good information on travelling between parallel universe. It also has a campaign setting, Infinity Unlimited (which will get its own book this December), in which two different Earths (one basically like ours, one very authoritan) wage a shadow war across multiple realities to prevent the different timelines from falling into the hands of the other side... while also trying to keep the secret of universe-hopping from worlds like Caliph, which has a starfaring nanotech Islamic civilization despite being only in the local year 1683, or Reich-5, where the Nazis have won WWII... And there's a magic-using parallel Earth called "Merlin" where the Trinity nuclear blast created a permanent "hellstorm" that showered the planet with mana-active radiation and made magic work again.You might also check out the Nobilis RPG, which has a multiverse on a vast scale - including some truly terrifying foes from outside of it. In fact, it would make a handy sourcebook for epic-level D&D in its own right, if you ever despair of what to do with your high-level PCs...</blockquote>