From the introduction: Individual realities consisting of a single timeline are called “universal streams.” Axiom Nexus has catalogued and documented 15,962,782 of these realities, and estimates the existence of at least 59,927,225 streams that have yet to be catalogued. Most universal streams can be classified into one of a number of “universal clusters,” groups of similar realities. In what cluster your game takes place (if you choose to use a documented cluster) will affect both the nature of the setting and its history. What follows is a list of universal clusters and a brief description of their commonalities. User summary: This game contains uncredited art that is probably copyright-infringing.