Here's what you need to know about them:
* Description: Furies are monstrous women with snakes for hair and wings. They are often depicted as being fearsome and vengeful.
* Purpose: Furies are associated with vengeance, especially for crimes against family, and they are tasked with punishing those who have committed such crimes.
* Role in the book: The Furies are central to the plot of *The Lightning Thief*. They are sent by Hades to punish Percy Jackson for stealing his bolt of lightning. The Furies chase Percy throughout the book, trying to capture him and deliver him to Hades.
While the term "fury" in the book might make you think of an uncontrollable anger, in this context, it directly refers to the mythical creatures.
Let me know if you have any other questions about the book or Greek mythology!