Hi, so I’m looking for a harry potter fanfic but forgot the name does anyone know it? The character’s name is Marina and she’s a Slytherin, and her parents are Voldemort and Bellatrix, but her real parents are Regulus Black and Bella Swan and those 2 just adopted her when her real parents died. Just like Harry her name is magically put into the goblet of fire. During the Triwizard Tournament Voldemort gives her this seaweed that allows her to transform into a mermaid, but she later finds out it’s genetics and her mom was a mermaid and during the Triwizard Tournament she has to save Draco. And she accidently bruned down the Malfoy mansion killing Nacrissa and that’s how she’s able to use the Elder’s wand with Harry to kill Voldemort. She was also a hocrux but was killed and came back to life” I don’t remember why but she was sent to Hogwarts.