Discworld's witches, based around the rural and mostly vertical kingdom of Lancre, deliver babies, treat warts, and keep an eye on troublesome kings, vampires, and incursions from other worlds. They don't have leaders, but Granny Weatherwax is the most highly regarded and steely of the leaders they don't have, assisted by Nanny Ogg - mother of fifteen and brewer of lethally strong cider. Equal Rites introduces witchcraft on the Disc, but the core trio forms in Wyrd Sisters, which sets the template for the series: sharp parodies of well-known stories (Shakespeare, fairy tales, opera) filtered through Pratchett's rural comedy. Across six books, the cast expands to include Magrat Garlick and later Agnes Nitt, and the stories move from Lancre to Genua and back again.