The Harrow deck is an integral part of the 2nd Adventure Path Curse of the Crimson Throne, and can also be used for in-game divination... and there's a pure card game you can play with it as well when not even role-playing (or if you have need for in-game gambling!).
Publisher's blurb: "In the Pathfinder Chronicles campaign setting, the Harrow deck has long been a sacred tool of Varisian fortunetellers. In skilled hands, the Harrow deck can predict crop results, divine the gender of your unborn child, or give hints about your immediate future. In unskilled hands, the Harrow deck is a sacrilegious gambling game - a cutthroat diversion for ruffians in every port to lose their hard-earned fortunes."
More when I get hold of a copy!
Book Details:
Authors: Jason Bulmahn, Mike Selinker, and Teeuwynn Woodruff, card art by Kyle Hunter
Publishers' Reference: PZO9200
ISBN: 978-1-60125-124-4
54 cards + rulebook for divination and card game
Date: March 2008
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Product page last updated: 15 March 2008