Hags are wizened old women, or powerful shapeshifting deities, who appear in folklore and children's tales. They are often seen as malevolent, but may also be benevolent.
Greetings, child. I am Baba Yaga, the witch of the woods. I have been watching you, and I see that you are a child of great potential. I would like to offer you a chance to learn from me, and to become one of my apprentices. What do you say?