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In page Slayer (Buffy the Vampire Slayer):

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Thousands of years ago in ancient Africa, a group of tribal elders known as the Shadow Men used powerful magic to infuse a captive girl with the heart, soul and spirit of a demon known as the Shadow Demon.[1] This process granted the girl great strength, speed, agility, reflexes, healing, endurance and psychic abilities in the fight against evil, she became the First Slayer, called to fight the vampires and other demons that populate the Earth. The Shadow Men's descendants went on to form the Watchers' Council, an organization dedicated to finding, training, and supporting Slayers.[2]