From the introduction:
Worlds Without Number is a fantasy role-playing game set in the far future of the Latter Earth, after innumerable eons of human history, alien rule, and unfathomable arcane evolution. The players take up the role of adventurers in this fading age, raising sword and sorcery against the foes of humanity and the obstacles that hinder their own ambitious aims. Many will perish on the spears of bitter rivals, be rent by the talons of monstrous beasts, or fall prey to their own reckless daring. Others, however, may yet live to obtain a name more glorious than kings.