A thing I've started doing a lot is rolling a die when I need to know something about the detail of the fictional world. Can ghosts communicate with the living? Can skeletons write? Sometimes this leads to delightful surprises and exciting turns of events. Sometimes it leads to things that feel a little... "off" I guess. There's many cases where reasoning from principles and making a ruling is the better choice. I'm still figuring out what that line is.
@Sandra I think Eero's approach is also strongly based on deduction from underlying logic, like yours, although he might use a random element sometimes too. I feel like having a strong sense of the setting makes it easier to reason from principles like that. I tend to build the setting through play a lot.
@Sandra Wow that's cool. I've never really used a big published setting, but I think it could be really fun. Eero's doing a Greyhawk thing at the moment which I think similarly benefits from some rich source material. It's got me curious, but I've never really fallen in love with any of the published settings.
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