Whore of Babylon
Castiel: This creature has the power to take a human's form, read minds. Book of Revelations call her the "Whore of Babylon."
Dean: Well, that's catchy– , 5.17 99 Problems
In Supernatural, the Whore Of Babylon is a creature of Hell mentioned in the Book Of Revelation who has the ability to take on the form of a human and read human minds. It appears during the Apocalypse in order to harvest souls for Hell.
In 5.17 99 Problems, it takes on the form of Leah - the daughter of Pastor Gideon. It pretends to be speaking to Angels, and helping exorcise demons, which are actually working in collusion with her. In fact, Castiel reveals that the Enochian exorcism she has taught the townspeople actually means "You breed with the mouth of a goat."
It convinces the townspeople of Blue Earth, Minnesota that in order to be among the Chosen who will experience Paradise on Earth, they must follow "the angels' commandments" - a set of behavior restrictions - and anyone who breaks them is to be killed. This, of course, condemning those who do the killing to Hell.
Castiel says that only a true servant of Heaven can kill the Whore, with a Stake of cypress from Babylon. It is decided the only worthy person is Pastor Gideon, but when he fails, Dean completes the act - suggesting he is close to agreeing to be Michael's Vessel.
- Wikipedia entry - in the actual Book of Revelation the Whore is killed by a "beast with seven heads and ten horns".
