Fiend Folio

Fiend Folio is any of three products published for successive editions of the fantasy role-playing game Dungeons & Dragons (D&D). All three are collections of monsters, making each Fiend Folio a sequel to that edition's version of the Monster Manual.

The bulk of the material in the first edition came from the British gaming magazine White Dwarf, rather than being authored by Gary Gygax, the game's creator. Readers and gamers had submitted creatures to the "Fiend Factory" department of the magazine, and the most highly regarded of those appearing in the first ten issues were selected to be in the publication.