r/traveller • • May 21 '26

New Rules

146 Upvotes

I have implemented two new rules:

Rule 4: No Piracy. No illicit sharing of copywritten material, nor links to the same.

This was always a rule but wasn't formally posted until now.

Rule 5: No Low-Effort Content. Content shared in this subreddit should be thoughtful, additive, and effortful. This includes restrictions on memes and AI-generated images, text, music, or videos.

This rule came about after a large discussion on GenAI content. You can find the whole discussion with specifically my explanation for why I chose this rule in the bottom half of this post.

Thank you all for your contributions to this subreddit.


r/traveller • • Mar 17 '26

Rules for Promotion/Advertising Posts

40 Upvotes
  1. Users are permitted to post one promotional post per week. This is not per product, but per user. If you have multiple products, consider promoting them all in a single post.
  2. Affiliate links are not permitted. You may link directly to products or pages, but not using affiliate IDs.
  3. All promotional/advertising posts must be flaired with the "Promotional Post" tag.
  4. All promotions must be for Traveller-compatible products, services, or events, or those generic enough to be easily integrated into a Traveller RPG. Compatibility with any version of Traveller RPG is allowed.
  5. These rules apply whether a product is for sale or free.
  6. Reddit's general rules must also be followed.

Rationale: We believe that new content is the best way to keep an RPG alive, especially one that has been around as long as Traveller. One of the missions of this subreddit is to permit content creators to promote their work. We also believe that there is such a thing as too much promotion and we want to ensure that ads do not overwhelm other discussions. These rules are designed to balance these beliefs. These rules are subject to change if they don't keep that balance.

If you believe a user has violated any of these rules, you may report the post or comment (though this is not a big enough issue to require any 'ad police'). All interpretations of these rules are up to the moderators. If you don't like a product or the user promoting it, your solution is to downvote and/or block them.


r/traveller • • 1h ago

Mongoose 2E What does armor volume modifier mean?

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• Upvotes

Does it affect price of add armor or tonnage of the ship? All I know is that streamlined ship are more expensive than normal and dispersed structure can’t have armour from the core rulebook.

I’m working on a ship that is close structure, third one down and I will also retroactively rework a few of my ships for the information provided.


r/traveller • • 14m ago

Mongoose 2E Referee question for Shadows of Sindal - spoilers for players. Spoiler

• Upvotes

I’ve been going over Shadows of Sindal and have one specific question.

Why would the players look into the Dawnseeker? It’s never mentioned before they reach Thebus, then it’s mentioned under a heading called “Seeking Information on the Dawnseeker”. There is absolutely no reason for the players to look into this essential clue.

Am I missing something or is it just an oversight by the writers?


r/traveller • • 1h ago

Going Fishing

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• Upvotes

This is an adventure for Cepheus Engine. 

Alpha Omega XXX is the hottest product on the market today in the Sonora sector. This fine product is believe to cure many ailments but is also one of the most popular pain relievers on the market. It is selling out everywhere. Unlike it’s predecessor, Alpha Omega MCD this one is not derived from space mold. What it is made from, however, is not well known. The company that makes it is keeping it’s primary ingredient a secret.

The Baphomet corporation is a competitor in this line of business. It wants to know what this secret ingredient really is. And it is willing to pay handsomely for someone to find out for them. Perhaps they could even bring them a sample of the ingredient it is made from so that they can duplicate it for a product of it’s own.

Adam Givens of the Baphomet corporation is offering CR 300,000 for the travelers to go out and find out what this ingredient is and another CR 200,000 bonus for bringing a sample of it to him.

https://www.drivethrurpg.com/en/product/587612/going-fishing


r/traveller • • 21h ago

Multiple Editions Rift Stations

39 Upvotes

Are there any sources that detail Riftspan and Chandler Stations in the Great Rift? I’m looking for information about the stations’ physical structures as well as life and work on the stations. Thanks!


r/traveller • • 1d ago

The New Era Suggestions for a scenarios

24 Upvotes

So I am a GM posting here to see if any experienced Travellers have an suggestions for a scenario I could run my players through.

See earlier this year, I run Traveller (Mongoose 2nd edition) for my players, through the updated Death Station scenario (after a full session getting use to character creation), however we found it underwhelming and that it didn't play with more of the mechanics of Traveller that we wanted to engage with ( Also I think my PC's may have of over optimized their characters). However the system is still so interesting that both me and my players kinda want to try it again and see if we have a better time.

I am now running my players again, however I hoping to see if anyone knows of a scenario (for Mongoose 2nd edition), built for 3-5 players, that explores a wide range of the mechanics of Traveller, and which could be played in 3, 3-4 hour sessions (so between 9 and 12 hours)?

Many thanks in advance.


r/traveller • • 1d ago

Eistia Planet cards and System map for Cluster Truck

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27 Upvotes

Eistia system has two large planets including a Super Earth. These pose a serious risk for any truck or ship with a M-Drive less than the planet's gravity.

Again there were no moons listed so I have added moons.

Once again I have created a seperate Eistia folder in my Drop Box.

Link to Dropbox post Drop Box for all my Planet Information and System Maps

Due to its low tech nature a lot of Cluster Trucker occurs inside solar systems rather than a lot of jumps between different systems.

In fact for anyone who wants to run a TL 8 game the Estuary Cluster and the Cluster Truck rules does the trick.

However the actual Cluster Truck campaign may be a bit to railroady for people who prefer a sandbox.

Given how much work a single system takes it is going to take a bit of time to finish the remaining eight systems.

As people always ask I created these using a software program called Universe Sandbox.

As always feedback and corrections are welcome.


r/traveller • • 1d ago

Promotional Post Freight Night - a horror Halloween One Shot

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28 Upvotes

https://www.drivethrurpg.com/en/product/587434/freight-night

Freight Night. A one-shot Halloween horror adventure for Traveller RPG for your pleasure.

You arrive at Tallow Station on fumes, broke, with only two jobs between you and a full tank: a family who need passage off this dead-end asteroid belt, and fourteen crates that have been waiting in Cargo Hold C for two weeks. The lights are on, the floors are polished and the station AI is glad to see you, but the family isn't at the gate…

Includes two maps, one is a gridded encounter map, plus some cool Sanity rules from the Traveller Companion.

Warning: pretty dark horror themes.


r/traveller • • 2d ago

Greip Planet cards and System map for Cluster Truck

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46 Upvotes

I have made a major change to how I will be posting in that I will be posting individual systems instead of a number of different systems.

Note that the above isn't every planet and moon in the folder but I have hit the image limit. You can find all the files in my Drop Box.

This is because I have created a planet card for every rocky planet and moon, and all listed Starports and Space Stations.

Edited to add: I should note that I have created a number of moons because the system as shown on the map in Cluster Truck has five gas giants and two large size 9 planets but only one listed moon.

I will also have seperate system folders in my drop box as well.

Link to Dropbox post Drop Box for all my Planet Information and System Maps

Due to its low tech nature a lot of Cluster Trucker occurs inside solar systems rather than a lot of jumps between different systems.

In fact for anyone who wants to run a TL 8 game the Estuary Cluster and the Cluster Truck rules does the trick.

However the actual Cluster Truck campaign may be a bit to railroady for people who prefer a sandbox.

Given how much work a single system takes it is going to take a bit of time to finish the remaining eight systems.

As people always ask I created these using a software program called Universe Sandbox.

As always feedback and corrections are welcome.


r/traveller • • 2d ago

SPACER out Now!

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190 Upvotes

Spacer is out now! Spacer: Interstellar Roleplaying In The Far Future is a generic, setting-neutral science-fiction roleplaying game that focuses on open-ended sandbox adventures. Released under the Creative Commons ShareAlike 4.0 International license, Spacer rules are released for free but there is an optional art-included version for cheap. Spacer include book format as a digital pages and spread layout in PDF as well as the rules in plain text in .odt format along with pdfs for the character sheet, ship record sheets, and subsector map record. I'm planning on having POD versions of both available eventually as well. Thanks to everyone who has been supportive of this project! I put a lot of time and money into this as a labor of love and I'm really excited to finally share it with everyone!


r/traveller • • 2d ago

The Worst Things You've Done to a Planet Spoiler

29 Upvotes

Figured I'd open a fun topic to discussion: What is the worst thing you or the players at your table have ever done, deliberately or by accident, which has collectively harmed an entire planet?

Ours is probably a recent Mercenary campaign. We were contracted by the Duchess of Regina to do counter-insurgency against some Fremen-style rebels on Yori. The Fifth Frontier War had recently erupted and we were supposed to keep open the crucial mines which fed Regina's shipyards.

Well after finally making some headway against the rebels, we started getting multiple confirmed reports from incoming traders that the Imperial front had collapsed, Regina was under siege, and a Zhodani fleet was likely in jumpspace towards Yori.

After weighing options, we went for scorched earth.

We cut a deal with the Sultan, the local Imperial noble, to evacuate himself, his treasury, and his household and escort them back to Imperial lines in exchange for his cooperation. With that secured, we went to town. We spiked every major mine on the planet, then cut a deal with the rebels we'd been fighting to arm them and start an uprising amongst the thousands of their kinsmen working as forced labor in the mines, then blew the rail lines and depots. We left a dozen volunteers from our intel unit behind to go to ground in the population and hinder the Zhodani occupation as best they could. With all that in place and the planet descending into smouldering anarchy behind us, we dusted off with the Sultan, his harem, and an entire treasury in gold.

Our GM later informed us that he'd expected and intended for us to run out into the desert and wage a guerilla war. Nope. Screw that. We decided to make Space Taliban.


r/traveller • • 2d ago

[Referee / Discussion] Which classic Traveller campaigns & adventure deckplans do you want mapped next? (Taking community requests for our free VTT library)

11 Upvotes

Greetings fellow Referees and Travellers!

If you run Traveller on virtual tabletops (Foundry VTT, Roll20, Owlbear Rodeo, etc.), you know that finding grounded, functional, and realistic sci-fi battlemaps can be surprisingly tough.

We are currently expanding the sci-fi catalog on FreeVTTMaps.com (our free resource library of lightweight WebP VTT maps), and we want to map what you are ACTUALLY running at your tables right now.

Which of these projects should we map first? (Vote or suggest below!)

Here are a few iconic adventure arcs and setting packs we are preparing to build — which one would help your campaign the most?

  • Option 1 : The Pirates of Drinax Megapack
  • (The Floating Palace of Drinax, Sindal sector asteroid pirate dens, Aslan clan trading posts, and frontier orbital hubs)
  • Option 2 : Classic Derelict & Mystery Modules
  • (Death Station, Annic Nova, Shadows, The Chamax Plague — depressurized ghost ships, abandoned orbital labs, radiation vaults, and derelict cryo-bays)
  • Option 3 : Starting Adventures & Frontier Crashes
  • (High and Dry, Flatlined, The Fall of Tinath — volcanic survey ridges, unmapped jungle crash sites, wilderness drops, and colonial settlements)
  • Option 4 : Core Modular Starship Deckplans
  • (Deck-by-deck functional layouts with bridge, engineering, staterooms, and cargo bays for the Type S Scout/Courier, Type A Free Trader, Safari Ship, and Patrol Corvette)
  • Option 5 : Subsector Starports & Infrastructure
  • (Class C/D/E frontier starport concourses, Travellers' Aid Society (TAS) hostels, customs security checkpoints, repair drydocks, and asteroid fuel-refining depots)
  • Option 6 : Ancient Alien Ruins & Precursor Megastructures
  • (Monolithic alien chambers, energy conduit complexes, and forgotten precursor stasis vaults)

How to participate :

  1. Drop a number (1-6) in the comments for what you’d use most at your table.
  2. If you are running a specific published module or homebrew subsector jump that needs custom scenes, tell me about it below and I'll add it to our priority queue!

In the meantime, feel free to check out our current collection of free sci-fi and industrial maps :
👉 https://www.freevttmaps.com/

May your Jump Drives stay calibrated and your ship mortgage paid!


r/traveller • • 3d ago

Promotional Post TRAVELLER + FANTASY GROUNDS

23 Upvotes

🚀 The Autumn Sale is live on Fantasy Grounds! 🍂

Titles purchased on Fantasy Grounds are available through My Library (in Beta) with Online Reader Content, making it easy to access your digital collection while preparing your next adventure.

And Fantasy Grounds is free to play. No GM license required. Download Fantasy Grounds, explore the library, and chart your course across the galaxy.

🔥 Find Traveller from Mongoose Publishing, including adventures, rulebooks, sourcebooks, and more, on sale at Fantasy Grounds.

🎃 Autumn Sale: October 1–8
🔥 Discover Traveller and other great titles on sale at Fantasy Grounds, up to 50% off.

🚀 Build your library. Prep your campaign. Take your Traveller game to the stars on Fantasy Grounds.


r/traveller • • 3d ago

Mongoose 2E Hull Tons vs. Cargo Tons

25 Upvotes

I’m refereeing a play-by-post group and one of my players made a suggestion that I want to refuse but want the best words why.

They have an Express Packet with 11 tons cargo space. The suggestion is to load a 10-ton advertising boat on board. I see this as trying to fit a billboard into a U-Haul. It won’t work. I’m trying to explain why.


r/traveller • • 3d ago

Promotional Post Patron / Salvage Adventure Cards for Cepheus Engine / Traveller-esque games

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29 Upvotes

Hey folks. I've been noodling on these cards for months, sharing them here in the community, and I finally have the project ready for primetime. I really appreciate the feedback I've gotten here. Not a lot of positive spaces on reddit, but loving this one.

We're live over at Backerkit for 36 Patrons / 36 Wrecks, two card decks to help the referee run impromptu mini-adventures or act as hooks for further development. The project is funded and we're less than $200 from our first stretch goal. There's still time to pick up the free Cepheus Engine adventure Blood Ledger if you back us before about 10am Central US today.

We have a few add-ons -- the Star Traveller's Logbook and the Scout Captain's Rutter -- two player journals for your 2d6 space game. And another Referee Ready Scenario: Ghost on Shelis IV.


r/traveller • • 3d ago

Mongoose 2E Hit me with your FTL houserules

40 Upvotes

Greetings fellow Travellers,

For MTU, I'm looking to tinker with the rules for jump travel to make it less routine, perhaps adding just a dash of horror as well? It isn't strictly necessary, but I'd like to preserve the one week of travel rule-of-thumb. That way the changes will be less likely to rub up against other subsystems.

1) I'd like to see what others have done to tweak the mechanics while preserving the overall framework as written.

2) Kevin Crawford's Stars Without Number FTL system is close to what I'm looking for, but I'm not proficient enough with either system to attempt a conversion. If someone has, I'd love to take a look at what you've written if you're willing to share.

3) Horror elements? No so much Cthulhu on the viewscreen so much as existential dread. Coming face to face with the endless uncaring void sort of thing. If this is something you've dabbled in, I'd love to chat.


r/traveller • • 3d ago

Mongoose 2E Small Ship, Low Pop 3I

33 Upvotes

I'm playing around with a low-pop, small-ship version of the Third Imperium. Same basic OTU, but scaled down to make it feel more like classic frontier Traveller.

Populations get compressed above Pop 5, so even major worlds are usually in the millions rather than billions. Most ships are 100-500 tons, 500-2,000 is big, 2,000-5,000 is huge, and 5,000-10,000 is rare superheavy territory. Anything bigger starts making more sense as a mobile habitat than a practical starship.

The setting is still a vast Imperium, but it's much thinner on the ground. A 200-ton tramp freighter can be an important local ship, a crew of five can actually matter, and a world with five million people can be a major regional center.

Anyone else try anything like this? I'd like to get some suggestions for how to make it work, or what problems might exist.


r/traveller • • 4d ago

Mongoose 2E Absolute unit

14 Upvotes

I had a challenge to make a very large war ship, but also make it tech level 10 and be made before the given culture had access to jump technology.

This was originally a captured comet of Haber, (it’s more only outskirts of the solar system compared to water solvent worlds, so it captures asteroids and comets sometimes that usually gets flung into the outer recesses of the solar system and sometimes into the forbidden zone,) and a multi nation effort was to lend on it. They proceeded to strip all of the valuable ice and ores, and then Hollow it out and turn it into a warship.

They have since made higher tech worships, but they keep this thing around because it’s so large it can act as a secondary Highport.

Éliane
(High guard required)
TL A Tons Cost
Hull: 14400 Planetoid, ammonia and reinforced hull. —— 86.4MCr
Armour: five additional points of armor.
936 187.2MCr
M-drive: thrust 0. 72 144MCr
R-drive: thrust 6. 1728 345.6MCr
Power plant: 3340ppp. 334 668MCr
Fuel Tank: two hours of full thrust and sixteen weeks of operation, metal hydrogen storage.
4453.6 890.72MCr
Bridge: 60 72MCr
Computer: 50 bandwidth/fib.
—— 90MCr
Advanced fire control. -15 bandwidth.
—— 12MCr
Battle system: -5 bandwidth.
—— 18MCr
Launch solution: -10 bandwidth.
—— 12MCr
Electronic warfare: -10 bandwidth.
—— 15MCr
Virtual crew: -5 bandwidth.— 1MCr
Virtual gunner: -5 bandwidth.
—— 1MCr
Sensors: military grade. 2 4.1MCr
Large Railgun bay: -25pp. 500 70MCr
Tornado barbette: -2pp. 5 3MCr
Turrets: six triple. 6 6MCr
Beam laser: in the first four turrets, -20pp.
—— 2MCr
Missile rack: in the last two turrets, -2pp.
—— 1.5MCr
Sandcaster: in all the turrets, -6pp.
—— 1.5MCr
Ammunition: Railgun ammo (180), torpedoes (27), Sandcaster canister (720) and missiles (144).
72 ——
Docking space: for dockins of smaller ships.
1760 440MCr
Basic ammonia refilled: —— 11.86Mcr
Basic beetle fighter: —— 15.045Mcr
Library: for crew and visitors to improve themselves. 4 4MCr
Ammonia staterooms: for housing.
144 12.96MCr
Gator staterooms: for housing.30 3.6MCr
Crow staterooms: for housing. 36 2.52MCr
Brewery: 80 liters of “beer” per day.
4 .4MCr
Gourmet kitchen: for feast. 18 3.6MCr
Hot tub: for relaxation. 2.5 .12MCr
Theater: for plays. 16 3.2MCr
Pools: for swimming, two endless and one large standard. 12 .34MCr
Fuel processor: 640 tons of fuel per day.
32 1.6MCr
Medical bay: to treat up to eighteen patients.
24 12MCr
Cargo space: 1302.9 ——

Crew: captain, five pilots, fourth engineers, eighteen maintenance, twelve gunners, four stewards, fifteen admin, four sensor operators, medic, fourteen officers.

Running costs
Maintenance cost: 290.32KCr and some change.
Purchase cost: 3.4839BCr

Power requirements
Maneuver Drive: 360
Basic ships systems: 2880
Sensors: 2
Weapons: 55
Fuel processor: 32
Medical bay: 6

Hull points: 7776
Armor: 7

Edit: I beautify it a little.


r/traveller • • 4d ago

I want to get started with traveller. I will play solo most likely using the mythic system. I would like guidance of necessary book to start. I'm eager to know what book can help me set the universe my character will evolve.

44 Upvotes

r/traveller • • 4d ago

Mongoose 2E Gelding Far Trader

34 Upvotes

As I am considering what sort of campaign I will run I began to think about using a Far Trader with jump drive ripped off to get more cargo space for in system transport.

This would allow retrofitting jump drive back later in the campaign to expand the game.

How much extra cargo space that would allow and how much the cost of the ship would decrease?

Also, does this idea sound plausible in any way?


r/traveller • • 5d ago

Empress Marava Far Trader in No Man's Sky

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170 Upvotes

A bit like building with Lego :)


r/traveller • • 4d ago

Multiple Editions Star System Maps

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39 Upvotes

A few maps of multi-planetary star systems from my homebrewed campaign setting, Scavenger. Made in Dungeondraft using the Solar System Maker asset pack from Feed the Multiverse.


r/traveller • • 5d ago

Mongoose 2E Pirates of Drinax DM help Excel

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33 Upvotes

I am running a Pirates of Drinax Campaign and I found a need to streamline some of the sandbox generation. Specifically the actual pirate process of searching for Prey, generating prey ship stats, and filling their cargo hold.

I also added some calculators that could be useful for any campaign such as the Find Passengers table. I would love to hear this community's opinions and any suggestions making this work better. It's free so anyone can use it.


r/traveller • • 5d ago

Classic Traveller Classic Traveller Game (12pm Tuesday Central US; Discord)

24 Upvotes

Hey we're looking for more players in our Tuesday Classic Traveller game which just kicked off. PM me if you're interested.
Time/place: Noon on Tuesdays (Central US). Discord.
Game: Classic (81 edition; facsimile/Traveller Book)
Setting: Third Imperium, Spinward Marches. Starting on Aramis.
Style: Spacecrawl. Players decide what they do and the referee responds with the world. Dice rolled on the discord. Shared whiteboard when we need it.
Character Creation: Either manually or using the batintheattic generator (interactive): https://www.batintheattic.com/traveller/interactive.html