during a quest in italy: Percy, Annabeth, Nico, and Will encounter a monster when it is suddenly killed by a single, specific arrow. It had been Y/n—daughter of Hades, Nico's twin sister—. Nico had never told the others about her, but she and Nico had a really good relationship and sometimes they sent each other letters. She was confident, solitary and intense. Her weapon has always been a bow with arrows made of Stygian iron (like the material used for her brother Nico's sword), but she also always had a blade (always Stygian iron) hidden in his pocket. she has always been Bianca and Nico's opposite in character. She was very sexy with a strong character, provocative, calculating, who hides behind a biting irony a deep loyalty, confident, intelligent, and very good at fighting.She lived alone in Italy because she didn't want to deal with all the drama with the gods but she was very good at fighting and really powerful. She had a great relationship with Nyx's son, Jake Crisp. But in truth, he was just using her, and when he decided to get rid of her, he even hurt her. In fact, she has a scar on the back of her neck that was hidden by her hair. No one knew about this or him, not even Nico.