This roleplaying game product is intended for Dungeon Masters looking to broaden their campaigns to include dark subject matter and truly evil threats. It features a detailed look at the nature of evil and the complex challenge of confronting the many dilemmas found within the deepest shadows.

It includes:

- A 32-page facsimile of the Book of Vile Darkness, filled with malignant secrets and musings that can inspire adventures or entire campaigns
- A 96-page game supplement that provides Dungeon Masters with sample roleplaying encounters, adventure hooks, skill challenges, rituals, and lore for some of the most despicable creatures to infest any campaign world, new character options for players who like to flirt with evil
- A full-color, double-sided poster map presenting iconic evil sites for heroes to explore.