334 Cepheus
Introduction: What This Is
334 Cepheus is a complete, standalone science-fiction roleplaying game built on the bones of the classic 2D6 tradition—but rebuilt for the way people actually play at the table today.
It is a game about competent people in dangerous places: merchant captains one bad jump from bankruptcy, Marines who know the cost of every bullet, drifters who have seen too much of the dark between stars. The universe is vast, uncaring, and full of opportunity. Your ship is your home, your crew is your family, and your next decision might make you rich, famous, or dead.
334 Cepheus is not a setting. It is a toolkit: rules for generating worlds, designing starships, running trade empires, fighting boarding actions, and navigating the political minefields of interstellar society. You bring the universe. We bring the engine.
Why 334 Cepheus?
There are dozens of science-fiction RPGs. There are several excellent 2D6-based systems. So why this one?
Because the Math Should Get Out of Your Way
The classic 2D6 engine is elegant—until the modifiers stack so high that the dice become decorative. 334 Cepheus caps modifiers at ±4 and replaces excessive bonuses with Boon and Bane dice (roll 3D6, keep two). This preserves the bell curve, keeps skilled characters reliable but not invincible, and means a natural 12 is always worth cheering for.
Because Character Death Is a Story Beat, Not a Chargen Tax
You spent forty minutes building a character with history, scars, and a reason to care. Then a single bad roll killed them before the first session. 334 Cepheus says no. Death during creation is optional. Mishaps create drama, enemies, and debts—not deleted save files. Your character emerges wounded, interesting, and ready to play.
Because Combat Should Feel Like Combat, Not Accounting
We replaced characteristic damage with a Stamina and Lifeblood track. Armor subtracts from damage properly. Initiative is rolled every round, so the battlefield stays dynamic. Suppressive fire pins enemies. Grenades have blast radius. A skilled marine with a rifle will drop an unarmored target in one burst—because that's what rifles do. Combat is fast, brutal, and decisive.
Because Your Ship Should Be a Character, Not a Spreadsheet
Starship combat uses Ship Combat Cards —one index card per vessel, no fleet-management software required. Missiles are abstracted. Bridge Drama lets your captain shout something inspiring and actually change the dice. Sensor Ghosts and silent running mean space combat is about tension and positioning, not just DPS races.
Because Trade Should Reward Preparation, Not Luck
The speculative trade system in 334 Cepheus adds Trade Legwork: dockside rumors, market analysis, corporate espionage. A captain who spends a week talking to dockworkers before buying cargo will outperform a gambler rolling dice blindly. The universe rewards competence. The dice reward the prepared.
Because Psionics Should Be Dangerous, Not Superheroic
Psionic powers are subtle, exhausting, and illegal in most jurisdictions. Using them costs Strain. Pushing them burns your Lifeblood. The telepath catches surface thoughts and lies, not entire memories. The telekinetic jams a trigger or slows a bullet, not lifts a starship. Psionics are a biological anomaly—a stress fracture in the mind—not a power fantasy.
Because the Referee Needs Tools, Not Homework
World generation takes five minutes and produces a planet with personality. The 5-Node Mission structure builds non-linear adventures. The encounter tables cover space, wilderness, and social situations. The complication tables rescue stalled sessions. You can improvise a sector at the table or build one meticulously over weeks. The system supports both styles.
Who Is This For?
| You are... | 334 Cepheus offers... |
|---|---|
| A veteran Traveller player | |
| A new GM | Clear procedures, quick generation tools, and a "Referee's Toolbox" section that tells you when to roll and when not to. |
| A player who loves character depth | A lifepath system that generates backstory, allies, enemies, and debts organically. Every character has history. |
| A tactical thinker | Position-based combat, meaningful armor, dynamic initiative, and crew roles that matter in ship combat. |
| A story-first player | Effect-based resolution, Bridge Drama, social skills that create opportunities rather than mind control, and a system that defaults to "yes, and" for competent professionals. |
| A publisher or homebrewer | Full Open Game Content under the OGL. Build your setting, your ships, your guns. The rules are yours to remix. |
The Design Philosophy in Six Principles
- Competence is reliable, but never safe. A skilled professional should succeed at routine tasks. The danger comes from the situation, not the system punishing them.
- Randomness creates texture, not walls. Dice should surprise you, not invalidate your choices. The bell curve is respected; modifier inflation is banned.
- Preparation is a mechanic, not just roleplay. Legwork, reconnaissance, and proper equipment are built into the math. The game rewards players who think ahead.
- Every system should fit on one page. If a rule requires more than a few minutes to explain, it is too complex for the table. Ship combat cards. Slot-based encumbrance. Broad-and-narrow skills. Simplicity is a feature.
- Consequence is king. Actions have fallout. A bribe creates an enemy. A pushed psionic power costs life. A marginal success leaves evidence. The world remembers.
- The referee is a collaborator, not an adversary. The rules give the Referee tools, not cages. The difficulty table, the reaction rolls, the complication tables—all exist to spark ideas, not replace judgment.
What You Need to Play
- Two or more six-sided dice (three is better, for Boon/Bane)
- Pencil and paper (or a digital character sheet)
- One person willing to be the Referee
- Two to six players willing to be desperate, ambitious, and occasionally brilliant
That's it. No grids. No miniatures. No proprietary dice. No app subscriptions.
The Pitch
If you want a science-fiction RPG where your ship feels like a home, your crew feels like family, and every jump into the dark is a gamble you chose to take— this is your game.
If you want a system that gets out of the way when the story is flowing and steps up when the lasers start firing— this is your game.
If you want to build a universe that is yours, run adventures that matter, and remember the names of the characters who lived and died between the stars— this is your game.
Welcome to 334 Cepheus.
Now generate a character, pick a destination, and hope your fuel holds out.