Splatbook

A splatbook or sourcebook is a supplement for a particular role-playing game (RPG) that is not needed for basic play, but is devoted to a particular facet, such as a character class or fictional faction, providing additional background details, scenarios, rules options, or other materials that players can use to extend or enhance the central game. For example, a "swords and sorcery" fantasy game might offer splatbooks for each of the races in the setting: humans, dwarves, elves, and others. A splatbook supplements the core materials of a game, which are typically given in a basic publication known as the core rulebook or by other names — these core books might also be referred to as sourcebooks, occasionally. Splatbooks may also be offered for other types of games, such as wargames or other tabletop games.