Book of Water
The Book of Water contains advanced and optional rules, rules which the GM and players can decide to use or ignore as they please. These rules add more variety and customization options to the game. They include information on playing a character from one of the Minor Clans or Imperial Families, and a variety of special mechanics such as Alternate Paths, Advanced Schools, Kata, Kiho, Ancestors, and the sinister secrets of black magic (also known as maho) and the Shadowlands Taint.