All the pitches have now been posted! The idea behind these pitches is that we, the community, are going to collaboratively build and flesh out one of them a

As promised, here is the third pitch you can vote for as the location that we will flesh out together during the event. Next week the poll will be posted on

As promised, here is the second pitch you can vote for as the location that we will flesh out together during the event. One more will be posted tomorrow and

As promised, here is the first of the potential locations for the event that we have cooked up. Two more will be posted in the days to come and after that we

We thought it was time to mix it up and do something a bit different. So, this year’s community event will have all of us take part in building a scenario loc

Below are some optional house-rules with somewhat more gritty and detailed mechanics that you may or may not like. I hold that the narrative is sacrosanct, no r

Earth. Ceres. Mars. A colony beyond the Ring. And one very dangerous slingshot race. The Expanse RPG Fan Community is happy to share a new collection of five

"The Fictional Sport/Game" is a fun world-building trope used by sci-fi and fantasy authors throughout the entire history of genre fiction. The idea being that

Joshua Romig has been actively creating content this year, we are no releasing his first Wellerman misadventures series, which includes "Phoebe's Song" and "Ghost Ship of Theseus," and more.

Today finally sees the release of the fifth volume of one-page adventures! The collection includes all 6 adventures from the 2025 one-page adventure jam in a single PDF. The theme of the 2024 jam w…

Joshua has introduced new house-rules for space combat in The Expanse RPG. It enhances the space combat gameplay and flow. This hack simplifies mechanics while adding plot protection, and includes …

Joshua Romig has been actively creating content this year, we are no releasing his first Wellerman misadventures series, which includes “Phoebe’s Song” and “Ghost Ship of Th…

The Expanse Transport Union Edition PDF rulebook, released on December 18, 2025. It updates gameplay for the decades between Babylon’s Ashes and Persepolis Rising, while maintaining original …

After more than a week of voting, a winner emerged: Ghost Ship of Theseus by Josh Romig! Congratulations Josh! This is a story about some very unnerving unintended side effects of Builder tech on human minds and ships. Check out the winning adventure and the other five submissions from this year's jam over on Facebook! Soon these will join the four previous years' jams in a collected volume here.

My name is Nicole Lindroos, co-owner of Green Ronin Publishing. Diamond … Nicole Lindroos needs your support for Support Green Ronin in Critical Legal Defense

The deadline for 2025 One-Page Adventure Jam "Echoes of the Builders" has come and gone. Six submissions this year, from puzzles to potential planetary doom, the dangers of human curiosity, altered minds, and moral choices. The voting has started on Facebook. In about a week we should know the winner and soon thereafter some dates will be decided for the live-stream of the winning submission.

Some of the content of this post was originally posted with the spaceship collection update, Here they are again, together with some more untested ideas. Ship Qualities The Couple Reactor and Parallel Reactor qualities do the same thing in different ways. I'd suggest you to choose one to test in your game. I prefer the Parallel Reactors for gameplay reasons, but I can see arguments for preferring "Coupled Reactor".

Whether your players' characters are merchants, smugglers, mercenaries, pirates, marines, scientists, or miners, they all share in largely being subservient to some political, ideological, or corporate superiors. Marines of the MCRN protect scientists on missions to the various new worlds beyond the rings, the scientists in turn serve both political endeavours as well as the free curiosity-driven research. UN ambassadors have to broker deals with the OPA on Ceres and Medina, both parties with one or several agendas for the betterment of their peoples or increase of power.

A small update of the tactical spaceship maps (found here) has been finished, as asked for by at least one person a few years back. The colours have been adjusted, and the font has been adjusted to make the damage dice code is more legible. Both the print and VTT versions have been updated, in colour and black and white. Format is still A3 sized. Different dimensions can possibly be made, also different resolutions. Just comment below and let me know.

A new edition of The Expanse Roleplaying Game with expanded rules that focuses on the 30-year span between the novels Babylon’s Ashes and Persepolis Rising. The campaign also includes 3 supplements, d...

Familiarity with game mechanics and a game's setting seems like obvious prerequisites to write an adventure. I am not saying it is not. However, it is not. Not really. It takes a brave person to write an adventure for a game and world with which they may only have passing, limited, or superficial knowledge. However, it is certainly doable. Writing a one page adventure certainly requires some skill.

Create a one-page adventure about the risks and promised rewards of Builder technologies. Found throughout the 1373 systems, Builder artefacts are sought for the secrets they hold, by corporations,…

So, you may be considering participating in the annual one-page adventure jam. That would require you to write. Writing is a process. Trying to figure out or structure your process could lower the threshold for taking part in the jam. There are many ways to break down a process. Process tracing itself is an interesting method used in the political and social sciences to understand and makes sense of organisational practices and decision-making.

After a reread of the starship combat rules, and discussion with community members, I have realised that the starship collection previously uploaded on this site may give the wrong idea about starship combat with regards to serious losses. The updated versions of these files are now uploaded. The reasoning behind the changes are laid out below. To clarify. Normal Losses (NL): can be taken multiple, up to six (6) times, increasing the effect.

To assist participants keep within the formal requirements, and to give hints and tips on form, structure, and content, we have made a Word template for one-page adventures. It is pretty self-explanatory and can be found on the Sheets and Reference page. Good luck and have fun writing up your one-page adventures!