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The Trisdekan Primer is a homebrew expansion series for Warhammer 40k RPGs that offers players an extensive range of new content, including infantry and vehicles with specific variant rulesets depending on the region or planet they are playing in. This book includes over 300 pages filled with various equipment sets ranging from basic weapons to specialized items such as chemical warfare systems and exotic mounts like camels! The Synaeger Catalog provides pricing information for these pieces of gear that can be used backwards-compatibly into earlier Games Workshop titles, but should not affect the original rules or gameplay.