In the dark spaces between galaxies, slumbering in hibernation, were the Reapers. In setting, the last great technological society, dubbed the Protheans, are not in-fact the creators of the mass relays scattered through the galaxy, but the latest in a long line of intelligent races to unlock the secrets of their use and discover their purpose.

In particular, the idea of technological advancement to the point of collapse is here, as are limited FTL routes, and the heat debt acquired by interstellar travel. Some of the fundamental basis of the Diaspora setting mesh quite well with Mass Effect. I'll refer a bit to the Mass Effect Wiki, which you can find here. Whilst a 'softer' approach than the default Diaspora, there's plenty of scope for characters and their stories. Aspects and stunts seem a good way to model the game's biotic and tech powers without going overboard with the rules. So I've been thinking about Diaspora, and it occurred to me that it may be the system to hack for Mass Effect.