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Message: <blockquote data-quote="Nagol" data-source="post: 6156583" data-attributes="member: 23935">For me, the primary reason to have a cosmology set up has nothing to do with setting up an adventure -- it's for the PCs to figure out what/how they can interact with/take advantage of the "stuff" in the game world.  A strong secondary reason is to act as inspiration for situations and NPC plans/actions.Are there nearby transition planes like the Ethereal that allow covert intelligence gathering?  Do some effects (bodily functions, ageing, poison, curses, divination magicks, etc.) cease on some planes and can the campaign movers factor that into their plans ?  How easy/hard are the planes to traverse?  Are there specific dangers stories speak of for traveling away from this world?  About how difficult is it to "break free" of the base plane?  What known magic exists that deals with planar traversal?  A default cosmology grants the basics for these answers and has me consider consequences and implications for the game world that I then use to introduce and evolve situations.  The use of a default cosmology also gives me one less area I need to brief players on for knowledge the characters would have since I can tell the players to RTFM (or at least limit the briefing to what changes I've made to the default).</blockquote>