How to Use the Book Of Vile Darkness Without Ruining Your Table
I brought this into a game back in 2006 when my group was playing 3.5e and one of the players wanted to run a character who was actively trying to become a lich. The book is dense, poorly organized, and absolutely not suitable for casual gaming, but it does contain mechanics that no other supplement really covers properly. If you are going to open it, you should know what you are actually looking at. It is a Dungeon Master's guide to evil, darkness, necromancy, and corrupt power. The core mechanical value is in the domain options for clerics, the special feats related to evil deities, the new prestige classes, and the extensive list of foul magic items. The book also includes sections on dealing with villainous NPCs, building evil cults, and some advice on how to run morally dark campaigns. Most of that advice is forgettable. The mechanical tables are where people actually look first. The domains range from things like the Evil domain, the Darkness domain, and the Death domain, each with unique powers that are useful for certain build archetypes. The necromancy spells are expanded significantly, with a lot of new rituals and spells that cost material components you might not find in normal shops. That is where the book becomes genuinely interesting for campaign builders.
How I Actually Used It In Practice
The problem I ran into was that the book gives almost no warning level for the content it contains. A player in my campaign found the section on soul gems and wanted to build his entire character around harvesting them. I had spent about forty minutes reading through the relevant pages when I realized there was no clear mechanic for how many souls a single gem could hold before it became unstable. The book mentions instability in a footnote somewhere on page 62, but it does not give a table or any actual numbers. I ended up making my own house rule based on the CR of the creatures being sacrificed and a DC 20 Will save check per soul after the third one, but that was pure guesswork. Another issue I noticed with the book is that several of the prestige classes require evil alignment and specific actions to enter, like killing a sentient being as a ritual. The entry requirements are written in a way that makes them sound mandatory, but they actually conflict with the general rules about when a DM can impose entry requirements. You can enforce them, but players will push back hard, especially if those requirements force them into behavior that contradicts how they want to play. I stopped enforcing those specific requirements after two arguments at the table and just told the players they needed approval from the NPC patron instead.
What the Book Gets Right
The magic item section is actually useful. The cursed items, the dark artifacts, and the wraithbone weapons give you tools for creating threats that go beyond simple stat blocks. Running a campaign villain with a +3 ghost touch weapon and a ring of spell storing preloaded with harm and disintegrate is a memorable encounter if the party finds it early enough to fear it. The domain options for clerics of Bane, Orcus, and other evil deities are also decent if your game has cleric players who want to play antagonists or morally gray characters. The book also has a section on creating haunts and cursed locations that works fine if you strip out the more absurd suggestions. The haunt rules are adapted from other Pathfinder materials and they function adequately in 3.5e with minor adjustments.
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What to Avoid
The racial entries for races like the Dretch and the Manes are mostly flavor text with weak mechanics. They do not add much to a campaign and you can safely skip them unless your villain literally commands a horde of them. The spell section has some interesting options but several of the new spells have caster levels that make them unbalanced at low tiers. I typically remove or rework any spell above 7th level unless the party is already at epic levels, because the power curve in 3.5e breaks quickly once you start introducing spells that can resurrect entire villages or curse a kingdom permanently. The Book Of Vile Darkness is out of print. You can find PDF versions through various marketplaces, but the legality of those depends on whether the seller has a license from Wizards of the Coast. The older 3.0 version is available through some digital retailers, and the 3.5 version is easier to track down secondhand. If you are playing a different edition, this book is not compatible. It is specifically designed for 3rd edition and most of the mechanics reference systems that do not exist in 5e or 4e. There are homebrew conversions floating around on forums, but they tend to strip out the most interesting content anyway. If you are running a game that deals with serious moral ambiguity or wants to explore the mechanics of corruption without reducing every conflict to a conversation about alignment, this book has usable material in it. Just read it before your players do, skip the sections that will cause arguments at the table, and do not hand a player a page full of soul-harvesting rules without having a clear plan for how it will work in your campaign. The book assumes a DM who already knows what they are doing, and it will frustrate anyone who picks it up without that context.
