From BioShock Infinite
Elizabeth is a character and A.I. companion in BioShock Infinite. With the game set in 1912 on a sky city (named Columbia) , Elizabeth is to take over the city once its current leader (or "Prophet"), Father Comstock, dies. Elizabeth can make and exploit "tears", rips to other universes, allowing her to move between them and/or bring in items from them. To prevent her from leaving Columbia, a remote "Siphon" is made which limits her powers, and she is locked in a tower under study and guarded by a giant mechanical bird known as Songbird.