The Fiend Folio is a collection of monsters for use with Advanced Dungeons & Dragons, similar in format to the original Monster Manual and effectively a supplement to that book.

    BASIC ROLEPLAYING is designed to be intuitive and easy to play. While character attributes follow a 3D6 curve, most of the other BASIC ROLEPLAYING mechanics are even simpler. Virtually all rolls determining success or failure of a task are determined via the roll of percentile dice.