Honestly, I was really enjoying your story right up to the end of chapter 3, but chapter 4 lost my interest almost completely. Your first few chapters felt really focused, but the Delacour section in chapter 3, which you've since removed, was a complete tangent, and this time/dimension travelling Demon Sword OC just left me scratching my head. Given we aren't invested in Harry's history with her, her appearance has almost no impact, and her defeat even less so. It felt like this was a sequel to a story I haven't read. I also thought the fight went on too long and became boring which was surprising considering how well your previous fight scenes flowed.