Granny Weatherwax
However, the newborn child is actually a girl, Esk (full name Eskarina Smith). Since Billet notices his mistake too late, the staff passes on to her. As Esk grows up, it becomes apparent that she has uncontrollable powers, and the local witch Granny Weatherwax decides to travel with her to Unseen University in Ankh-Morpork to help her gain the knowledge required to properly manage her powers.