But they were more than a creepy but altruistic cult. The entire religion was elaborated by the Master to cultivate a pool of normal human operatives in the wastes and to prepare the world for his coming. Every person the CoC converted to their faith was one more person who could willingly be dipped in FEV. All Children eagerly awaited their chance to be baptized in the great baptismal font to the north - the vats of FEV in the Military Base.
The game takes place in the year 2161 on the West Coast of what used to be the United States of America, particularly in California. It begins in Vault 13, the protagonist's home. Vault 13's water chip, a computer chip responsible for the water recycling and pumping machinery, has broken. Armed with a PIPBoy 2000 and meager equipment, the protagonist is sent out into the remains of California to find another water chip.