Or buy the digital PDF version:
WHAT IS DECUMA?
Decuma is “the R&D for your RPG”: a tarot-inspired card game that helps the GM and their players collaboratively create all the important details for their campaign, including key locations, character connections, and setting conflicts. Plus, Decuma can be paired with any tabletop RPG setting or system, including D&D, Savage Worlds, Powered by the Apocalypse, Pathfinder, and more—so you never have to worry about compatibility.
Decuma uses a unique set of question cards that give the whole experience a feeling of mystical interconnectedness—as if Destiny herself is guiding the campaign! Decuma saves the GM a ton of prep time and can be easily customized to focus on (or exclude) specific aspects of campaign creation. You can use it to add depth to a pre-written adventure or to create a home-brewed world from scratch!
Best of all: this big world-building tool fits into a little card box! There are no books to lug around!
WHAT DOES DECUMA DO?
Character Connections: The Sun Cards – Suits of Wands & Cups
Players come to the table with basic character concepts, but by using Decuma they create backstory and connections with one another that enrich the story. It gives the players and the GM lots of story elements to work with so no more strangers meeting in a tavern!
Location Building: The Star Cards – Suits of Coins & Swords
Decuma facilitates collaborative world building for any setting! Whether you need a fantasy village, a generation ship in space or a neighborhood in an urban city, this game can make it! By the end of your session you will have a map to reference during your campaign, NPCs the party can interact with, and cultural elements, such as slang terms or philosophical beliefs. Best of all, the players know the location as well as the GM so lots of explanation time is saved later!
Group Dynamics: The Moon Cards – The Major Arcana
Your PCs shouldn’t just have history with each other! They have been interacting with the rest of the world too! Who are the party’s allies? What do they believe in? What big event made them famous or infamous? Building another layer on the location and character connections, they players also gets to build a collective history that will impact how they interact with the game world as a party!
Decuma can be easily customized to fit your needs just by including or excluding cards!
Running a pre-written D&D adventure in Waterdeep? You already have a location! Leave out the star cards and just build character connections and world dynamics!
Playing a PBTA game like Masks or Demigods that has built in character connection mechanics? Just play with the star and moon cards to build your location and your world dynamics!
What are people saying about Decuma?
Decuma is player investment in a box, at your fingertips, and plays just as well on its own or as the opening to a campaign.Senda Linaugh, She's a Super Geek Podcast
Decuma is one of the most fun and engaging games I've ever used as a session zero! The way it ties your players' characters together before regular play even begins is invaluable to anyone who wants to run a great campaign.Spencer Stark, Creator Alice is Missing & Icarus: How Great Civilizations Fall
We have played RPGs at our table together for years and don't have any issue world building, but using Decuma added new ways of thinking about our worlds, along with new questions to discuss, a simple and collaborative map build, and with the dealing of the tarot cards - the element of chance which we as ttrpg dice rollers love.Brandon 'Rev' Wentz, The Critshow Podcast
Decuma is both simple and powerful, but also proves to be extremely versatile. It turns world building into a blend of collaborative storytelling and adds enough game elements to provide structure without getting in the way. I see it becoming an essential part of every session zero we do.Aser Tolentino, The Redacted Files Podcast
SEE DECUMA IN ACTION

- Watch creator Kimi run Decuma to create a Sci-Fi world on the Happy Jacks RPG Network
- Listen to Decuma used for Vampire 5th Edition (Decuma starts around 0:30:00) on The 12-sided Stories Podcast
- Watch Decuma used for Shadowrun 5th Edition on the Happy Jacks RPG Network
- Watch Decuma adapted to be used without character connections for Masks: PBTA (Masks already has a great character connection system built in!)
- Watch Decuma used to create a Supernatural Depression-Era Carnival , Livestreamed from the Strategicon Convention
- Listen to Decuma build both a gritty Wild West town and a TSA-style Space Port on The Critshow Podcast
- Listen to Kimi run Decuma for the Redacted Files Podcast
- Listen to Decuma build a monster-filled Wild West town on the She's a Super Geek Podcast
- Watch Decuma used to build a steampunk fantasy world and a corporate-owned Mars colony on Saving Throw Show!
- Listen to Kimi talk through Decuma and give some examples of its abilities on the Fear the Boot podcast!
THE DECUMA TEAM

Kimi Hughes
Writer and Creator Kimi has been creating table-top RPG content for over a decade. After playing and GMing dozens of systems, she developed a fondness for TTRPG systems that included collaborative world and backstory development. That fondness gave her the idea for a card system that could add these elements to any RPG system: Decuma! With her company Golden Lasso Games, she develops indie RPGs and tools for gaming. She also manages the Happy Jacks RPG network of streams and podcasts.

Samantha Terry
Samantha is a professional designer and artist. She has designed merchandise for a number of companies, including Blizzard, DC Comics, and Warner Bros. Entertainment. A talented artist and tarot enthusiast, Samantha is drawing incredible custom designs for the cards in the Decuma deck. She also uses her skill to create custom clothing custom clothing and jewelry for her company, Stiarna. With her company Golden Lasso Games, she develops indie RPGs and tools for gaming. She also manages the Happy Jacks RPG network of streams and podcasts.

Aabria Iyengar
Aabria played in the very first test game of Decuma, and had been instrumental in the development of the game since that day. She is a social media wizard and is currently the CMO and acting CEO of Dice Envy. A skilled GM and table-top RPG player, Aabria can be seen streaming games regularly on HyperRPG, Saving Throw Show and Happy Jacks RPG.

Mac Beauvais
Mac Beauvais is a seasoned brand professional specializing in licensed product management and development. She has 10+ years experience in the entertainment business overseeing thousands of products on over 30 brands, from concept to completion She also has a personal interest and passion for the entertainment field, having immersed herself in mediums such as film, console gaming, online gaming, literature, comics and more.