Whether you want to run a ninja-based campaign, or intend to have them as effective enemies for your samurai players, this contains a wealth of information.
Publisher's blurb: "This book Includes a detailed history and description of a number of historical shinobi (aka "ninja") ryu or clans, NPC write-ups, and a sample shinobi village."
More when I get hold of a copy!
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Click HERE if you want to buy this book from Amazon.com or HERE
if you prefer to use Amazon UK.
Book Details:
Authors: Darren-Jon Ashmore and Mark T. Arsenault
Publishers' Reference: GRG1004
ISBN: 1-890305-40-5
Paperback and PDF, 64 pages
Date: November 2002