The whole "A Magical Society" series of releases from Expeditious Retreat Press is a goldmine for GMs of all sorts. I have a complete collection, some of them in print, and all in PDF. They are essential reading for planning and running a campaign that lives and breathes.
Today's Deal of the Day is A Magical Society: Silk Road for $12 in PDF until tomorrow morning (usually $30). Commerce, trade routes, and more.
A Magical Society: Silk Road is a 160 page supplement detailing great overland trade routes. Borrowing extensively from the caravans of Central Asia,
A Magical Society: Silk Road covers a variety of topics: what factors engender great overland trade routes, what elements accompany the existence of silk roads, and how do caravans function on the road (with consideration to terrain). Due to general unfamiliarity with Central Asia, an entire chapter is dedicated to the historic Silk Road with maps detailing the major trade destinations. And last but not least, there is a trade system with over 1,000 trade goods, giving ultimate tools for economic simulation.
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