Splatbook

A Splatbook is a non-core sourcebook for an RPG that provides additional rules and material that can be used with the main system. An example of a well-known splatbook is the Book of Weeaboo Fightan Magic.

The White Wolf fandom is often cited as the origin of the term. The names of the supplemental material books for World of Darkness would vary depending on which branch of the game they were for (clanbooks, tribebooks --say that three times fast!-- , tradition books, etc.), but they still all followed the same naming conventions of [SOMETHING]books. On Usenet newsgroups, these came to be known as "*books", after the asterisk's function as a wildcard character in computing. Common CIS slang calls these "splats", because they (kind of, sort of, if you squint) look like star-shaped splatters of paint, slime, blood, or some other slightly viscous fluid.

Splatbooks tend to be known for their containing significantly more powerful classes, feats, etc. than the core books for the respective system.

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