Comstock's actions, convinced Rosalind to help him bring Booker to the reality where Columbia exists to rescue Elizabeth. Elizabeth explains that Comstock will always remain alive in alternate universes since the Luteces have enlisted the Bookers of numerous different universes to try to end the cycle. Since stopping Comstock requires intervening in his birth, Elizabeth takes Booker back in time to a baptism he attended, in the hope of atoning for the sins he committed at Wounded Knee; she explains that, while Booker changed his mind, some Bookers in alternate universes accepted the baptism and were reborn as Zachary Comstock. Booker, joined by other universes' Elizabeths at the baptism, allows them to drown him at the moment of his choice, preventing Comstock's existence. One by one, the Elizabeths begin to disappear, the screen cutting to black on the last. In a post-credits scene, a Booker awakens in his apartment on October 8, 1893. He calls out for Anna and opens the door to her room before the screen cuts to black. Gameplay BioShock Infinite is a first-person shooter with role-playing elements. Infinite adapts the gameplay formula of BioShock, with weapons, powers, and upgrades often functioning similar as those in the earlier game, albeit named differently. The player may carry only two weapons at a time, and can collect other weapons and ammunition from defeated enemies or the environment. In addition to guns and melee attacks, the player can use superpower-bestowing Vigors; these include the ability to shoot lightning, disable enemies by launching them into the air, or controlling enemies or machines. Vigors can also be laid on the ground as traps. Vigors require Salt, the equivalent of magic points, to power the abilities. Booker has health and a damage-absorbing shield; the shield automatically regenerates out of combat, while health must be replenished with medical kits or food. If Booker dies, the player revives in a safe area at the cost of money, while local enemies are also partially healed. Items called Gear grant passive abilities that can improve the player's strength or damage resistance. A piece of Gear attaches to one of four slots; only one piece of Gear can be affixed to a slot at a time, with extras stored in the player's inventory. Player attributes can also be improved by finding Infusions, which upgrade the players' shield, health, or Salt meters. The player is opposed by enemies representing