Mirrored Soul

After reading a book where the main antagonist suffers a foolish and poorly written death, Sælinne (Selin) decides to write all her complains to the author. And exactly that less than adequate email had invited her to write her own ending of the book as she sees fit, to replay and dissect every scene and every arc of the book, starting with the very first one, where the villainess kills most of her other siblings that would pose a threat in her ascension to the rank of the sect leader later on. However she will not be the author of it, but the villainess herself.