A Space Opera Setting for Unbelievably Simple Roleplaying
From the introduction:
One hundred billion citizens of the galaxy all saw it. The vision flashed before them for mere seconds, but what they saw stuck with them ever since. A black ship over a white moon. This seemingly innocuous image became burnt onto the brain of every man, woman and child across the galaxy. The event became known as the Somnium. Life would never be the same again.