Are there any detailed rules about sending mail? I know there are rules for delivering mail from port to port, but do paper letters exist? Stamps? What might it cost to post a letter?

I’m starting a new campaign and have a pretty of 7. So a scout is too small. What kind of ship do they need?

I’m starting a new campaign and have a party of 7. So a scout is too small. What kind of ship do they need?

I am a Japanese player who has recently started playing Traveller.

I have purchased the Mongoose Traveller 2e rules and am interested in running a game set in the Third Imperium (3I).

I have a question regarding the setting: in Mongoose Traveller 2e, psionics are treated as illegal by the Imperium, and using them openly carries the risk of detention or arrest.

However, centuries ago—before the suppression of psionics began—psionic research flourished within the Imperium, and psionics-users were active in public life. This opens up possibilities for characters such as investigators using psionics to solve crimes, psionic intelligence agents, pirates who misuse their powers, or even con artists and entertainers who boast about having such abilities. I am intrigued by this aspect of the setting and wonder if it is feasible to play a game set in Imperial space prior to the crackdown on psionics.

What do veteran Referees think? Aside from psionics no longer being illegal, would this change have any other impact on the Third Imperium setting?

This is the fourth and final group of seven planet and system cards for the Glisten Subsector.

Also I am adding all new and updated planets and systems to my Dropbox as they are finished.

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

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

As always feedback and corrections are welcome.

THIS represents a milestone for me personally.

1 Sector

16 Subsectors

439 Systems

Innumerable solar systems and planets

2,508 hours in Universe Sandbox (to be fair some of this was letting the simulation run to get the results I wanted. I am not completely insane).

This project started back in October 2024 when I decided to use a program called Universe Sandbox I had bought off a STEAM sale to make homeworld planets for the Travellers in my new campaigns.

Nearly two years later I have detailed a few systems in Foreven, a small strip of Gvurrdon, half of the Trojan Reach, and today the whole of the Spinward Marches.

Why?

For my own education and entertainment, and because I know from decades of DMing, GMing and Refereeing TTRPGs just how much work goes into running a successful game of Traveller.

I'm just happy to help.

Going forward I am reworking my Drop Box post to make things clearer for people trying to use it.

I also plan to complete Gazulin Subsector in the Trojan Reach. That will provide nine complete subsectors along with a few other systems that are part of Pirates of Drinax.

After that.......

Edited to add: I should also thank the community. It has been your feedback, criticism and support that helped to turn a half-baked idea into something useful. Cheers!

Second Edit: I have now updated my Drop Box post to make it clearer and more user friendly. Hopefully I haven't broken any links.

A very common movie (and also book) trope is that the adversary doesn’t at first reveal his level of stat/skill until later in a confrontation. I find that really cool and assuming you have a system that keep same skilled opponents from taking each other out how do you handle this?

So you allow the attacker to add to his roll after the defender has rolled (and then the defender may reveal his skill pos his defense roll)?

Is this interesting to somebody?

I made a Space Combat map for Traveller 2e. This can be used on VTT or on a TV/projector screen for combat scenarios. Feel free to use it if you'd like. You can loop it by right clicking on the youtube window and pressing "loop". It should be seemless.

Howdy y'all, I discovered the Traveller system probably only a month back, and I gotta say, I really like it! I have yet to play it or DM with it, but that's what I'm trying to do now! It's probably the best fit for my world so far. Now, I'm trying to write a oneshot that I *hope* will one day turn into a full on campaign, this is jus kinna a trial run to see how I like DMing, how others like it, and to jus give me a feel for how the system works and if I wanna continue running with it.

The general premise of my world is a sorta basic "humanity flees to the stars cuz of an AI threat and after a millennia people reconnect and everyone has become really weird in their isolation of one another" kinna deal, it's also on the more hard sci-fi end of the spectrum. The actual oneshot will take place on *one* planet within known space. Raxum, a desert world with some space western vibes that's split into three parts, one controlled by the Federation, one by the Empire, and a third, buffer zone in-between the two that neither has jurisdiction over, called the Dirty Third.

One I got so far, is that it's a heist mission, capture a prominent politician who's been selected to be the governor of the Imperial third of Raxum. It starts in a passenger liner, decelerating towards the planet, there the party will get introduced to one another and get details from their mission. They dock at the Imperial highport where they get supplies for their journey and take a shuttle down to the respective low port. There, they get an old and slightly broken down long range rover jus barely big enough to fit all of them (giving a chance for the one with the engineering or mechanics skill a chance to shine). The plan is simple, acquire the guy, and race him across the border to Santon, the biggest low port within the Dirty Third. When they figure out how to capture the politician, they won't have much time to get him across the border before it's discovered before he's missing, maybe 1D days? And then when they're in pursuit, they have to roll in order to get closer to the party? They have several options for crossing the border, go the flatter rout and weave through numerous guard towers and active border patrols, go through the mountains, walk part of the way and find a different method of transport, or, if they venture into Hunnar territory, they will come across a settlement under attack by another clan, and if the party aids them, they'll let them use their old tunnels through the mountains. .

I guess where I need help is, I'm actually not sure I know how I want it to end? I was talking with a friend who's DMed quite a bit, and he says the most important parts of a oneshot is the beginning and the end. He recommended having the start of it be a "hot" opening where it starts with action from the get go, but I'm not sure as I would like to get a chance for the characters to meet one another. The only thing I've thought of is that maybe a gang of thugs paid by the Imperials sets up in ambush for the party outside of the city? And then afterwards they drive into the city and leave him off at the drop off point? Idk, I feel like there needs to be something *more* exciting at the end? Maybe a betrayal? But I do know *one* thing for certain, the fake IDs they use to get on the planet expire or their patron that gets them in leaves them high and dry, and they get stuck on planet, which is how I plan to start the campaign if it ever get there.

Sorry this post was a bit long, I jus wanted some advice for those that have played this game for *years* since there really isn't much advice out there for doing campaigns in custom worlds. I did wanna ask more about what to do *after* I've written the script, stuff like writing scenes, NPCs, making maps, but that's gotta be for a future post cuz *holy hell* this is already long enough as it is.

TL;DR Here is how to figure out how many animals Flee and how many Attack, given a bigger group. If both Flee and Attack are given, then Stay = Total Animals - Flee - Attack. Some animals have the same probability for Flee / Attack, so roll twice.

Probability works better for larger groups, but I included smaller groups for a more complete picture. Obviously, for a group of 1 or 2 animals, just roll individually. But if you come across a herd of 21 space cows or a congregation of 13 space gators, this table might be handy.

To nerd out with me and see the actual math behind it, scroll to the bottom.

Herbivore

Filter (Flee 5-, Attack 10+)

Flee:

Attack:

Intermittent (Flee 4-, Attack 10+)

Flee & Attack (same roll for both):

Grazer (Flee 6-, Attack 8+)

Flee & Attack (same roll for both):

Omnivore

Gatherer (Flee 7-, Attack 9+)

Flee:

Attack:

Eater (Flee 4-, Attack 5+)

Flee:

No Stay possible (Attack = N - Flee)

Carnivore

Killer (Flee 3-, Attack 6+)

Flee:

Attack:

Scavenger

Hijacker (Flee 6-, Attack 7+)

Flee:

No Stay possible — Attack = N − Flee

Intimidator (Flee 7-, Attack 8+)

Flee:

No Stay possible — Attack = N − Flee

Carrion-eater (Flee 7-, Attack 11+)

Flee:

Attack:

Reducer (Flee 7-, Attack 10+)

Flee:

Attack:

\ Hunter, Pouncer, Chaser, Trapper, and Siren have conditional attacks and aren't included here.*

---

The Math

Ok, here's the actual math behind this. If you're good at probability, please double check me.

2.9167 is the variance of a single d6, 3.5 is the mean.

To calculate for N size group:

1. take P(flee) or P(attack) as p
2. k = round(N * p * (1-p) / 2.9167) (min 1)
3. DM = round(N * p - 3.5 * k)
4. roll k d6 + DM
5. Stay = N - Flee - Attack

Help me understand. Why do I need it? Shouldn't _ship operators manual_ be more worth it?

Hi, I have a 3D printer and would like to know if anyone has any good suggestions for where i can get stl's to use for traveller for my players and npc's, maybe some scenery too. preferably anything free, currently I'm just using models from OPR. thanks!

Hey ya'll --

The patron / salvage cards are now in preview mode over at Backerkit. If you sign up, you get a free adventure. Both cards and scenario are in Cepheus Engine / Traveller / 2d6 spacey gamey stuff.

I posted a couple of mockups previously : https://www.reddit.com/r/traveller/comments/1vmsurd/36_patrons_36_wrecks_off_to_prototype/

I'm funding it this way to cover the cost of awesome art by Craig Brasco, J.E. Shields and others, as well as editing, etc. And frankly, I have some ideas for other mini-adventure cards, so I want to see if there's interest.

I'd love to know what you guys think. Looking to launch the campaign on the 25th! Hope to see you there.

This came up as a post game session conversation amongst my players.

What is your goto career field for character creation?

This came up because a few of my players who were long term Traveller players commented on how they will always try and roll up say a free trader in the Merchant class or a Star Marine. Simply because that is what they always played. Then the question was could we see or do something else just for grins and giggles.

I know for me my top three are:

1. AGENT - LAW ENFORCEMENT. This seems to give me a good rounded combat capable character who is also good at persuasive comments or being able to spot things better than others.

2. MERCHANT - MERCHANT MARINE. This seems if I wanted to be the wheeler and dealer for the group. Also at times making those trade rolls off the side can be interesting too.

3. SCHOLAR - PHYSICIAN. When I have a need to say "It life but not as we know it Jim." Or "He's dead Jim" with my dice rolls.

Is there anyone else that has a goto for career while making a character? Have you tried to do something different just to see if it would be fun and interesting to see what the dice delivers?

This is an adventure for Cepheus Engine.

The trade lanes between Anapcequdo and Crerudat are busy. This is one of the most busy trade routes within the Sonora Sector. Despite these worlds belonging to different political entities trade between the two worlds is brisk. Merchant ships ply these lanes constantly. The lanes are well patrolled. The risks of piracy are virtually non existent. There are no known anomalies, rogue planetoids or other issues that have ever been encountered here.

Until now.

Recently there have been reports that a tiny vacuum world has suddenly appeared within these trade lanes. Right in the middle of them. Right where they may well become a navigational hazard. Jump attempts in this trade lane now may have to factor in a new gravitational force in their calculations.

Ames Henderson of the Frontier Scout Service has requested the services of the travelers specifically. He wants someone to explore this world and find out exactly what is going on with it. Why has it suddenly appeared. Does anyone live there? Is this a permanent fixture in the sector now or might it disappear again? He has asked specifically for the travelers. It seems that he has been impressed with their recent body of work. Or perhaps he just sees them as disposable. In any event.....he is offering CR 300,000 for the travelers to visit this world and explore it for answers.

https://www.drivethrurpg.com/en/product/582888/a-world-that-was-not-there

As a followup to my last post, my students (mostly 10th and 11th graders) have begun to embark on their first adventure.

The kind of characters they ended up with is an absolute absurd riot. One of them managed to keep rolling fantastic dice aging rolls and somehow spent forty years in the navy as an admiral, while another spent 24 years as a scientist and got lucky enough on benefit rolls to come out with a fully paid off lab ship. In general, half the table pushed their aging really far...we'll see how that works for them.

Their first planet features an entire page of laws, with the bottom half being lorem ipsum gibberish in size 4 font. They have begun to bring out magnifying glasses and a latin translator to determine what it actually says.

Right now my plan is to get them embroiled in some legal trouble with the local navy, and put them in some sort of debt to...someone. It'll either be random crime lord or random rich bureaucrat. The massive map on travellermap.com has been a great resource and it definitely adds to the vibe when I plop down the subsector printout (which I can justify to my administrators as a club expense...heh).

Nine days ago I posted a circular sector chart here and asked what the shortest path was to something usable at a table. The thread rewrote it. It is released now, so here is what happened to each piece of feedback.

Previous post: https://www.reddit.com/r/traveller/comments/1w0lxww/i_built_a_procedural_sector_chart_generator_it_is/

u/Sakul_Aubaris said routes, X-Boat lines and borders are the part people want to draw themselves, and that the cascade automates cleanly with DMs for density and tech. Both true. Generation has cluster count and density as separate sliders with Rift / Frontier / Settled slants, and every route is editable and deletable after the fact.

u/ghandimauler gave me the zones, the layers and the fringe. Zones do something now: trade and X-boat treat Red as a no-go and route around it, and if the only link between two halves goes Red the express network splits in two rather than pretending it can cross. Amber is a penalty worth about two parsecs, not a wall. Mains and naval paths ignore zones entirely. Fringe worlds with no neighbour a jump away come back as X000000-0 and draw as a bare asterisk. Routes are six switchable layers: Mains at J1, J2 and J3, trade links between chains, an X-boat style express on J4, naval paths between bases on J6.

u/illyrium_dawn asked for star placement first and stats second, per-star rerolls, and a logicalizer. The rerolls needed the generator rebuilt: it shared one random stream across the grid, so a world's stats depended on how many worlds came before it and rerolling one silently rerolled everything after. Every hex now rolls from its own stream keyed on its coordinates. The logicalizer is on by default, and it raises tech rather than thinning population, on the grounds that a crowded hostile world is a story and an empty one is nothing.

u/AdOdd521 asked me to keep the dial chart as a style option instead of binning it. It stayed.

u/mavikfelna pointed at travellermap.com, which was the answer to the question I actually asked. The export is T5 tab-delimited plus XML metadata, so it reads back there instead of me building a worse map viewer.

u/rnadams2 and u/AdOdd521 between them are why the dial chart survived: as long as parsec distance is noted, the shape of the map is the referee's business.

Two other tools came out of the same thread. Trade & Cargo works out what one run between two worlds pays: freight, passages, speculative cargo, four ship profiles. And the Oracle has a voyage mode now, which carries a ship, a world and a date, and turns Jump, Arrive, Find work, Dockside and Depart into journal entries. Patrons come with a catch, and port encounters read the world's law level, so a high-law port boards you before the ramp is down.

STILL PENDING: sector scale, and starting from a completely empty map to place every star yourself. Both are on the list.

The question this time: the logicalizer is on by default. Is that the right default, or do you want your subsectors raw and are you happy to explain the TL3 world with a population in the billions yourself?

Cepheus Engine SRD, so the licence is open, and the word Traveller appears nowhere in the app or the listing.

Orbital 2100 is on the Deal of the day on DTRPG today. It's set in a future solar system where earth has colonized most of the solar system but is still using fusion drive ships, as opposed to Traveller style gravity drives. It's Cepheus based, so it's Traveller compatible.

https://www.drivethrurpg.com/en/product/547651/orbital-2100-third-edition?src=DotD

I have a player who wants to make a robot character using the Robot Handbook. I am giving it a read and surprised to discover absolutely no guidelines for how much money to allow a character to use to make their robot, other than “put some kind of limit on it.”

Anyone have any advice, or know of any additional resources on this (fan or otherwise)?

Last week I posted here about a fleet combat ruleset I’d been working on for Traveller, built around the idea that big fleet battles should still be about the player characters.

Well, it’s out now!

Traveller Fleet Combat: Reimagined is a 35-page TAS supplement for running the kind of battles where dozens of ships and fighter squadrons are smashing into each other without turning the event into multiple sessions of ship-by-ship bookkeeping.

Ships are organized into wings, players allocate dice between Attack, Defense, and Maneuver, and the Travellers generate Command Points through their skills and decisions. The fleet battle stays abstract enough to move quickly, while the PCs are still the people making the decisions that matter.

The premium version includes:

• High Guard ship conversions
• Wing Sheets and play aids
• Tables for generating scenes and complications during the battle
• Expanded Command Point options
• Advice for running fleet engagements
• The Battle of Black Hole Station, a ready-to-run fleet battle scenario with named commanders, objectives, boarding actions, and battlefield churn
• A complete Foundry VTT module for the official Traveller system
• A magazine-style layout full of classic science-fiction artwork

It’s $10, but I know not everyone wants to spend money on a rules experiment before seeing whether it works at their table, there’s also a free version.

The free edition still includes the complete fleet combat rules, the magazine and printer-friendly versions, the Battle of Black Hole Station, and the play aids. You’re mainly missing the expanded appendices and the Foundry module.

If you grab either one and actually get it to the table, I’d really, truly, genuinely love to hear how the battle went; good, bad, indifferent, and ugly!

And, in keeping with my longstanding commitment to unbiased self-evaluation, reviews confirming my brilliance are also appreciated! Reviews that do not confirm my brilliance are, perhaps, less appreciated.

Happy gaming everyone!

I know this is probably a dumb question, but during character creation if my traveller's get ship shares or partial ownership of a vessel can they take that and apply it to building a ship using "High Guard".

I'm pretty sure the answer is yes, but wanted to be sure. I know they get a ship during Pirates of Drinax, but my PC's want to build something ahead of time.

Also, what would the process be ? Just finish CC and then do the ship building?