By the game's end, it is revealed that the player-controlled Booker DeWitt was taken from another reality and instructed by the Luteces to take Elizabeth away from Columbia under the pretense of having his gambling debts wiped away, in order to prevent a future in which she accepts her place as Comstock's chosen successor. Comstock is in fact an alternate version of Booker himself, who met Rosalind after assuming his new identity at some point in time and became obsessed with the concept of a racially pure paradise.