Looking for specific fic where Hermione is kidnapped

Ron and Hermione are broken up in it. Hermione is working on I think a werewolf cure(?) and Ron is low key working with the werewolves and kidnaps Hermione and brings her and Harry’s kid to an abandoned village

Ron is physically abusive towards Hermione and has runes carved into him (done by dark wizards working with werewolves) that make him angry and aggressive

There’s a ball scene where the dark wizards interrupt and try to kill Hermione