Season seven deals with the Potential Slayers, normal girls around the world who are candidates to succeed the Slayer upon her death. It is revealed that Buffy's resurrection caused an instability which allows The First Evil, a spiritual entity that Buffy encountered in the third season, to begin tipping the balance between good and evil. It has inactive Potential Slayers hunted and killed by Caleb, a sinister and misogynistic preacher turned serial killer who heads a cult called Bringers, who worship The First as a god. Inside the Hellmouth it raises an army of Turok-Han, an ancient and powerful sub species of vampire. Caleb destroys the Watchers' Council.