I recently started a D&D space opera campaign which I’m quite pleased with. It’s in a homebrew setting (I hesitate to use the term “original” here) designed to be a giant mashup of all the spacey tropes, in the same way that standard D&D is a mashup of all the fantasy tropes. So we’ve got not-Jedi, we’ve got a “good guys” Federation and a “bad guys” Empire, battledroids, bug-eyed monsters, and so on. It’s a lot of fun!

So when it came time to figure out spaceships and the whole economy of trawling around in a little freighter, I naturally looked to Traveller, the grand-daddy of space RPGs and pretty much the unacknowledged model for things like Babylon 5 and Firefly. Its “tonnage + Credits” ship-building model has been imitated dozens of times by dozens of other games, and its interplanetary trade matrices have appeared in places as weird as Savage Worlds’s gothy-fantasy pirates 50 Fathoms campaign.

But you can’t just lift those systems out of Traveller and plug them in to D&D—the numbers are crazy and designed for a very specific gameplay loop. As SirPoley describes succinctly in his Four Table Legs of Traveller series, the game assumes that your party will be paying out huge amounts of money to pay for their ship every month, which will in turn drive them to engage in trade and/or exploration to scrounge up enough money to keep the bounty hunters off their tail. This trade/exploration is procedurally handled by the GM via random encounter tables and except for the random appearance of “Patron” encounters, could all be done faster via computer if you were so inclined.

And this is where we come to why I’ve never run Traveller. Just like I have little patience for grinding in a video game, I ain’t got time to build self-populating spreadsheets just to watch the numbers roll. Patrons, those rare high-paying jobs that actually force you to get out of your acceleration chair and go do stuff, are intended to be the spice of Traveller, a fun diversion that creates a break from the core gameplay loop. And I’m just… no. -.- For me, that should be the meat of the game, with the trade/cargo/passengers business being a fun little mini-game for the people who are interested in it.

So while I’m lifting some of the trade rules and tables from Traveller, the math is going to require some heavy tweaking to make it work for my purposes. The Enigma Sector characters already have a small ship that they used to escape from their Badguy Empire captors, and there are enough planets it could reach that they never have to upgrade if they don’t want to, so the “exorbitant debt payment” motivator is out. In its place, I’ve reduced the amount of money that cargo and passengers will make, and increased the operating expenses of the ship itself (in the form of fuel and spaceport fees) so that it’s still worth engaging in that system, but not to the point where taking time off from cargo hauling to go on adventures seems insane. (As SirPoley mentions, the pay scale for Patron encounters in Traveller is keyed off the size of your party’s cargo hold rather than having a diegetic in-universe value in order to guarantee this, which is taking handwavium just a little too far for me.)

I also want the players to be able to spend money on gear and such—partly because this is still D&D, and partly because at least one of my players just really loves that and I want them to be able to engage on that front. If they’re breathing fumes as far as money is concerned because they have to pay $50,000/month just to keep their ship running, they’re more likely to dump the ship than to go out exploring, which kinda negates the purpose.