D&D 5e Sourcebook Review: The Book of Many Things
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The Book of Many Things uses the Deck of Many Things as an organizing theme for a broad DM toolbox. Its contents include ways to use cards, puzzles, traps, magic items, character options, factions, locations, and creatures. It is more substantial than a long explanation of one magic item, but less cohesive than a conventional setting or campaign. Its strongest sections provide places and groups you can actually use.
The card structure connects a varied collection
Chapters take their names from cards and develop ideas associated with them. Key discusses introducing and using the deck. Balance offers card-based prompts and procedures. Puzzle includes riddles and trap rooms. Gem develops treasure and magic items.
This structure gives a mixed supplement a recognizable identity. The subjects are broad enough that a DM can use much of the material without putting the dangerous deck itself into the campaign.
The cost is reference convenience. A thematic chapter name is not always the clearest indication of where a rule or tool lives. The organization is attractive to browse, but a reader looking for every magic item or every location may prefer a more conventional arrangement.
Card tools offer an alternative to ordinary random tables
Card Sparks, Inspiration Hand, Journey Spread, and Encounter Deck are among the book’s methods for using cards to generate or organize ideas. They give the deck a role in preparation beyond its famous in-game effects.
I like that broader use. Drawing imagery and combining associations can suggest a different kind of prompt from rolling a single number on a table. It is particularly appealing to a DM who enjoys visual connections and improvisation.
It remains a preferred method rather than a necessary improvement. Someone already comfortable choosing ideas or using random tables may not gain enough from the card procedures to justify the purchase alone. Their value depends on whether this way of working actually suits the reader.
The factions and locations are the more concrete attraction
The Solar Bastion, Moonstalkers, and Heralds of the Comet provide organizations with associated characters, places, and adventure possibilities. The Seelie Market, Harrowhall, Gardmore Abbey, and Donjon Sphere supply different kinds of settings to explore.
That is where the book most clearly becomes useful beyond a famous artifact. A group, a headquarters, or a mapped strange location gives a DM something more substantial to develop than a suggestion to “add uncertainty.” Several sections can function as independent campaign ingredients.
Their variety is also the limit. They do not form one setting with a clear geographical or political structure, and they are not chapters of a complete adventure path. A DM chooses which ideas belong together and provides the reasons the characters encounter them.
Character options are a small portion of the package
Rewarded and Ruined are the two backgrounds. They connect character history to a dramatic turn of fortune. Cartomancer provides a card-themed feat, with a small spell selection adding further player material.
These options fit the theme, but this is not a large class expansion. There is no broad subclass collection comparable to Xanathar’s or Tasha’s. Players buying only for one feat or background will use a small fraction of the contents.
The backgrounds also belong to the book’s original 2014-era presentation. A revised-rules campaign should review how their benefits fit its background system rather than selecting the name alone and assuming the mechanical package is identical.
The deck’s consequences receive meaningful attention
Some classic card results can remove a character from ordinary play, disrupt possessions, or change the direction of the campaign. The book addresses those possibilities with material around effects such as Donjon and Void, including ways to keep play moving.
This is a worthwhile improvement over introducing a catastrophic artifact and then having no adventure ready for its consequences. The printed tools make disruption more usable, but they do not make every possible result welcome to every player.
I see the deck as a deliberate campaign choice. Its uncertainty can create memorable stories, while a group attached to a particular ongoing arc may find that same uncertainty frustrating. The book offers support for the consequences rather than proving that the deck belongs in every game.
The book and the physical card set are different things
The Book of Many Things is the sourcebook. The physical Deck of Many Things boxed product includes the book, a card reference guide, and sixty-six cards: the original twenty-two plus forty-four additional cards. A digital book purchase should not be assumed to include physical cards.
That distinction matters when comparing listings. The more elaborate package has a physical presentation appeal, but the content decision is whether you want the book’s toolkit, the card materials, or both.
B3’s verdict
This is a worthwhile specialized supplement for a DM interested in card-based inspiration, unusual factions, themed rewards, and modular adventure locations. It is less compelling as a general player purchase or a continuous campaign. Its best material shows that the deck’s imagery can inspire much more than random disaster. Buy it for those actual tools, not just the fame of the artifact on the cover.