Masterbook is a generic role-playing game that was created by West End Games as a follow-up to the multi-genre role-playing game Torg and the science fiction game Shatterzone, which used a modified version of the Torg system. Like Torg, the Masterbook system utilized two complementary forms of in-game conflict a unified dice mechanic, which was based on a roll of two ten-sided dice, and a game-specific deck of cards (the MasterDeck, similar to the Drama Deck in Torg) that influenced random number generation, character actions, and the game's plot.