Cepheus Engine vs Diaspora
Compare Cepheus Engine and Diaspora side by side. See differences in complexity, dice, genre, and more.
| Cepheus Engine | Diaspora | |
|---|---|---|
| Genre | Sci-Fi | Sci-Fi |
| Tags | Sandbox, Toolkit, Ship-Based, Career-Based, Skill-Based, Random Character Creation, Random Tables, Exploration, Simulation, Tactical | Worldbuilding, Collaborative, Tactical, Simulation, Toolkit, Sandbox, Tag-Based |
| Core Mechanic | Roll 2d6 and add the relevant skill, characteristic modifier and difficulty modifiers. A total of 8 or more succeeds. The margin above or below 8 is the Effect, which determines the outcome where the rules call for it. | Roll 4dF (four Fudge dice, range -4 to +4) plus a Skill from the character's 15-skill pyramid, compared against a fixed difficulty or an opposed roll. Spend a fate point to invoke one of your Aspects for +2 or a reroll; the referee compels Aspects to push the story and pay fate points back. |
| Dice | 2d6 | 4dF (Fudge dice) |
| Complexity | High | Medium |
| Availability | Free core rules | Paid |
| Runnability | 4 of 5 book tools | 4 of 5 book tools |
| License | Open Game License 1.0a | OGL v1.0a |
| Third-Party Publishing | Commercial publishing allowed — Open license | Not yet researched |
| Summary only, not legal advice. Check current terms before publishing. | ||
| Publisher | Samardan Press | VSCA Publishing |
| Year | 2016 | 2010 |
| Languages | English, Italian, French | English |
| Best For | Groups who want interstellar sandbox campaigns built around trading or exploring aboard a shared ship. | Groups who want to collaboratively build a six-to-ten-system star cluster at session zero, then play hard-SF interstellar campaigns where personal firefights, vector-based ship duels, social confrontations, and platoon-scale battles each run as their own dedicated mini-game. |
| Highlights | Career terms generate experienced characters whose skills and starting assets reflect their prior lives. Planetary trade codes modify cargo prices, giving merchants a reason to compare routes and markets. World and encounter tables provide the referee with material for an interstellar sandbox. | Cluster generation rolls Technology, Environment, and Resources for each star system on a -4 to +4 scale, then the table maps slipstream links between systems before play: the setting is built collaboratively rather than handed to the players. Space combat collapses range and velocity onto a single -4 to +4 vector track, so a torpedo-heavy frigate trying to hold standoff range and a beam-armed cruiser trying to close create real positional tension without grids or hex maps. Personal, social, and platoon combat each run as separate mini-games sharing one fate-point economy, so debating a planetary council, leading marines into a city block, and a knife fight resolve in the same language while feeling mechanically distinct. |
| Considerations | Failed career survival rolls kill characters by default, with an optional mishap alternative requiring referee approval. Damage reduces physical characteristics, weakening injured characters until they recover. Operating a ship requires tracking recurring expenses alongside its income. | Built on the pre-Fate-Core 2009 version of the Fate engine: terminology, the aspect-invocation flow, and the older stunt design predate later refinements, so players coming from Fate Core or Fate Accelerated will need to relearn the conventions. Cluster creation, system linking, and the five-phase collaborative character generation are designed to fill a full first session before play begins, so the game does not support spontaneous one-shots or solo character prep. Vector-based space combat enforces momentum, fuel, and reaction-drive constraints, so ship scenes resolve as deliberate tactical exchanges rather than narrative-first cinematic dogfights. |