Returning from a quest, 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 big sister, and Bianca di Angelo's twin sister- Nico had never told the others about her, but she and Nico had a good relationship. 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 is outgoing, with a strong personality and humor. She had taken a sabbatical because of a promise she made to her twin: She would have to take a break from everything until she had unlocked all her powers to be able to better protect Nico (only she and Bianca knew the details of the promise, Nico only knew that she and Bianca had made a promise). During her sabbatical, she met a boy (Jake) with whom she had a relationship, but for certain circumstances it didn't go ahead and he had used her. He wanted to make a deal where he would become her only priority but she refused. And after fighting she left him but with a scar on the back of her neck. but later in the story he'll reappear