2003 Fun Fact: While I was working on Fiend Folio, my wife told me about a terrible nightmare she'd had. I wrote her nightmare into a monster in the book, the soul tick.

— James Wyatt (@aquelajames) January 21, 2020

2003 Fun Fact: Goals for the Fiend Folio included supporting Deities & Demigods with monsters from myth, expanding options for the Improved Familiar feat, filling in the upper Hit Die range for demons and devils, expanding options for the planar ally and planar binding spells, 2003 Fun Fact: Fiend Folio asked each author to make a "new gith" monster—something that might carve out a new place in D&D cosmology as the gith races did in the 1st edition Fiend Folio. The submissions included the ethergaunt, kaorti, maug, nerra . . . and shadar-kai.

— James Wyatt (@aquelajames) January 21, 2020

including a selection of good monsters from the original Fiend Folio, presenting a variety of creature types, and presenting interesting non-monster entries (like the prestige classes for fiends).

— James Wyatt (@aquelajames) January 21, 2020