Well, mine has to do with this place called the "Void". It's a huge, inbetween universe realm that is a HUGE black space that acts as a bottomless pit. In the Void are these large cubes that clump together to create what the denizens of that realm call "Clusters", which are basically like continents. There are thousands, millions, billions of Clusters, each one different from the last.
The realm is also full of devilish creatures who will try to harm you. The character you play as just wants to get out, no matter what will happen.