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Sig: Manual of the PrimesClick to magnify

Sig: Manual of the Primes


Welcome to Christmas in July! In celebration, this digital title has been marked down by up to 40%! For more of Santa's savings, visit our Christmas in July sale page.


Sig is the nexus of the multiverse: a city connected to everywhere, a refuge for the oppressed, and a prize for tyrants. It’s a launching point, allowing fools and heroes to venture into the eternal planes of existence.

Play as one of the Giants of the Plane of Stone or the Wyrms of the Plane of Destruction. Challenge yourself in scorched wastelands of the Crucible in the Plane of Flame. Seek answers to hidden secrets in the Umbral Delta of the Plane of Shadow. Defend yourself in the Final Court, where the Seven Magistrates provide final remedy to any injustice.

Want to try Sig out? Download a free Quickstart for Sig, which includes everything you need to run a one-shot session.


Chapter 1 presents the rules of play. It offers tools for collaborative scene framing, free-wheeling roleplaying, tense conflicts, and revealing interludes.

Chapter 2 is about creating compelling characters. Build your own freebooter, be they descended from planar heritages or immigrants from the prime worlds. Weave a web of connections and characters who bind the group together.

Chapter 3 describes the Eternal Planes of Existence, their inhabitants, and their supporters. Each plane has their own landmarks, native inhabitants, friendly Factions, and resident divine Powers.

Chapter 4 is the Atlas of Sig, describing the various neighborhoods of the city and the important people who represent them. Discover the Hive, where the destitute and the desperate struggle to survive; or the glory of Highspire, home of the mighty.

Chapter 5 speaks of the infinity of prime worlds, those familiar mortal realms. These include rules for collaborative world-building and a list of exciting worlds to explore, as well as 8 new prime worlds prepared by a roster of professional designers.

Chapter 6 provides other resources to run the game, including detailed examples of character creation and an example of play. This chapter also offers the Night Market adventure, exploring what happens when the Shard Realm of Empire binds to the City Between.


Sig focuses on collaborative narration and difficult decisions. When two participants propose different outcomes to a situation, each participant rolls dice, adding in bonuses if they have applicable Talents. The participant in the conflict with the highest score gets the desired outcome and must pay the Price of Victory.

Players gain Influence by confronting their Beliefs, and they use that Influence to shape the world around them and encourage each other to grow. As the player characters change, so too does Sig; the city’s tethers to different planes of existence shift and reorganize, changing the fundamental nature of the city itself.


Read Katherine Cross’s review of Sig on Gamasutra!

Listen to an actual play podcast of Sig !

Listen to this podcast interview on the Modifier Podcast about aligning setting to mechanics, or this one on the Misdirected Mark Podcast where I describe the game.

Check out the free Sig quickstart,

Print copies of the full-colour, glossy hardcover book are available at Indie Press Revolution.

A crowd of diverse fantasy characters

Welcome to Sig!

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Reviews (6)
Discussions (4)
Customer avatar
Andrew B October 11, 2023 2:38 pm UTC
So is this the same book as Sig: City of Blades except they both use different systems. Just trying to figure things out. Thanks in advance for your response.
Customer avatar
Daniel D May 12, 2022 9:33 pm UTC
Recently I've found that I don't like some of the fifteen Planes. So I spent a couple days coming up with fixes.

Justice: Somehow doesn't feel coherent or evocative. Is it about high standards and tests of mettle, or a nice place where people help one another? Replacement: PLANE OF COMPASSION: Here, Mind flows as a great river across the landscape, cascading down endless terraces and canyons. In the lands of Compassion, energy is derived from understanding and empathy, and the Powers here have arranged things around identifying and solving the problems of natives and visitors alike, to keep the river of Mind flowing and clear. To some, this endless compassionate network of mutual aid is a paradise; to others, the lack of privacy presses close, and the inhabitants seem like busybodies who can never leave well enough alone.

Dreams, Shadow, Freedom: All three are described as ever-shifting places with reality emerging from and melting back into a fog. They feel too similar and too indistinct....See more
Customer avatar
Neil S July 13, 2021 5:31 am UTC
Customer avatar
April 29, 2020 10:54 pm UTC
Any chance the map of the city could be released as a single image file and/or one-page PDF?
Customer avatar
JASON P June 01, 2020 8:24 pm UTC
The full version of the map is available over on our website at
Customer avatar
August 06, 2020 2:22 pm UTC
Awesome! Thanks.
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28.07 MB
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File Last Updated:
October 01, 2017
This title was added to our catalog on February 07, 2016.