Faith Lehane is a Slayer who was activated in 1998 when Kendra Young died at the hands of Drusilla, and the last Slayer to be called by the original succession line before it was abolished in spring 2003.

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Born in Boston, Massachusetts, Faith had a difficult upbringing and life, which left her with various trust and emotional issues. Though she found some stability with her Watcher, Faith retreated to Sunnydalewhen they were brutally murdered by the vampire Kakistos, where she became a friend and ally of Buffy Summers and the Scooby Gang. However, numerous events and circumstances took a toll on Faith's sanity and she defected to the side of the evil Mayor Wilkins, helping him to carry out his Ascension and finally finding the stable father figure she always wanted. On the day before the climactic Graduation Day Battle, Faith was critically injured by Buffy and put in a coma, from which she awakened eight months later.

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She proceeded to wreak even more havoc in Buffy's life and then attempt to assassinate Angel in Los Angeles as part of a deal with Wolfram & Hart. However this was a ruse by Faith in order to get Angel to kill her as Faith had actually become remorseful of her past deeds and wanted to end her life. Nevertheless, with help from Angel, she came to terms with her past and willingly surrendered herself to the L.A.P.D. to face the consequences of her actions. Three years later, Faith busted out of prison to assist Angel Investigations in containing the recently released Angelus, subsequently returning to Sunnydale with Willow Rosenberg after Angel was re-ensouled to assist the Scoobies in their battle against the First Evil and its army. Furthermore, Faith was even appointed the leader of the Scoobies after they lost confidence in Buffy's leadership, only for Buffy to be accepted back as the leader when Faith's first plan led herself and several Potentials into a near-fatal trap.

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After the First was defeated and all Potential Slayers were activated worldwide, Faith initially stationed herself with the new Slayer Organization's Cleveland squad.

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