Hi I'm looking for a fic called "fLuTtEr" by a user named Anonymouse or something like that. It's a grimdark fic where Fluttershy ends up having a child that grows into a monster and turns her into a monster as well. The story gets really dark. Ponyville citizens start to go missing because Fluttershy was feeding them to her son. Twilight is tasked to solve the mystery of the missing ponies and she goes off on her own to learn dark magic that would help her. Literally all of the mane 6 die. Applejack kills her whole family and is brought back from the dead by twilight to fight Fluttershy's son. By the way his name was Whisperwing Blackthorn. Twilight becomes a death-mage or a dark-mage or something along those lines and completely loses all of her empathy. Pinkie Pie becomes a monster like Fluttershy and Whisperwing. In the end fluttershy and her son are defeated.