I saw this AU on Pinterest and thought, "I should write this." I hope you like it. And Y/N isn't a part of this. Sorry.

Warnings: Dark HP universe

Enjoy~
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He remembered it clearer now. An 11 year old boy, a scrawny, knobbed knee boy stared at the giant bearded man at the door. "You're a wizard, Harry." Harry had stared at the man with slight hesitation but accepted the offer of studying at the School for Witchcraft and Wizardry, Hogwarts. Anything to leave the abusive uncle and aunt he had. Once he had jumped onto the train to Hogsmeade at platform 9 3/4 and settled into a caboose, a fiery haired boy with freckles jumped in in search of his chocolate frog. Oh boy, there he knew, a friend and accomplice to be. "Hi." Harry had said to the boy. The boy didn't reply but sat down next to him, devouring the chocolate frog. "My name's Harry. Harry Potter." The boy with blue eyes looked at him and glanced up and down at him. "I'm Ron Weasley. Pleasure meeting you.

There, as they shook hands, they knew a strong alliance formed but it felt incomplete. "Is there anyone sitting in here?" They looked towards the caboose door and saw a girl with buck teeth and brown hair that sat like a mane. "Sure. Sit down." In the girl's hands was a big thick black book with a title Harry couldn't make out. "Hermione Granger." She shook hands with the two boys and continued reading her book, intriguing Ron and Harry. "What's that?" Hermione looked up and answered, "A book about Dark Magic. Interested?" The two boys looked at each other, a spark in their eyes glinting of curiosity and need. "Sure." They moved next to Hermione and they shared the book, reading quietly the rest of the trip. As expected from all three brilliant minds, Harry, Ron and Hermione were sorted into the green house, Slytherin.

There in the snake's house, they learned powerful magic. Teachers grew to love quick thinking, smart Hermione Granger but Severus worries at how Hermione's curious eyes side look at the Forbidden Area of the library. No one would dare bad mouth half bloods, nor bully mudbloods because they know Hermione is watching. She knows all the tricks in the Dark Magic book; painful spells that are irreversible, deadly potions that have no cure and hexes beyond imaginable- and Hermione knows how to not get caught. No one outside of Slytherin would pay attention to the second youngest child of the Weasley family, Ronald Weasley, so quiet compared to his brothers but that is a big mistake. He casts his first dark spell and immediately he craves for more.

Ron sneaks into comfort of blood and makes outlawed sacrifices to forgotten gods. He wonders why his family could abandon this happiness in the favor of a flickering light. Harry Potter, the chosen one, the special one, the abandoned one. He took a side glance at the light, at the people who did nothing for him and dives into the dark side. The trio have no mercy upon anyone even their teachers, its just no one can pin it back to them. "Hello, my devious companions." 12 year old Ron slid next to Hermione who was elbows deep into a book about curses and hexes. "See you're studying for nothing, again." Hermione grumbled back at him and flipped to the next page, her eyes grazing over each word in a fast motion. "After Potions, during free, I was thinking." Ron stated with a look of mischief in his face.

Harry scoffed, "You? Thinking? That's dangerous."  Ron stuck at his tongue out at Harry and grinned. "Anyways, I was thinking to pay Colin a... Visit." It intrigued the other two so much that Hermione looked up from her book and marked her page. "What kind of visit?" Hermione mentioned. "Not the good kind of course. I'm just bored and my bloodlust is going through the roof right now." Harry laughed maniacally and scared some other students and a few teachers. "Sounds legit. We are settled. Colin, Forbidden Forest, after Potions." Ministry Officers found Colin in the woods, swinging from a noose, covered in warm blood. They never traced it back to the trio and no one ever will. Then, teachers began dropping like flies. After the murder of Colin, Professor Lockheart was diagnosed dead from drinking poison of a viper. Snape finds the trio huddled around Pettigrew's mouse form, paws spread wide and nailed to the ground. And don't even get me started with 5th year.

When Aurors found Umbridge's remains, they vomited in the fireplace in her prissy pink office. All the work of some kids and the Wizarding World didn't even notice. "Eye of newt." 16 year old Hermione read our from her list. "Check." "Dragon's blood." "Check." "Viper scales." Ron plopped the scales in the cauldron. "Check." "Deer hide." "Check." "And... Done! Now, stir slowly." Ron twirled the spoon in the cauldron slowly but was immediately stopped by Hermione who fussed. "Too fast, moron! Like this." She spun the the spoon as slowly as she could, handing the spoon over to Ron once she was done. "Sheesh, Mione. So serious." Harry chuckled and sighed. "I'm so glad we're friends." Hermione said, crossing her arms across her chest. "Or else, you'll be a pile of ashes on the floor right now." They shared a laugh as the concoction was ready. "Perfect." Harry and Ron works to slowly poured the mixture into a vial. They looked at the label which read, "Our First Original Potion".

Next morning, Professor Slughorn was found poisoned and strangled to death in his office with the fire roaring in the fireplace. The trio congratulated themselves and gladly celebrated with Butterbeers and Cauldron Cakes. Then, they were 17 and Voldemort attacked Hogwarts where three people from there that destroyed his hocruxes. He'd thought he would be facing an old wizard and a bunch of goody two shoes. But he thought wrong. Instead in their place was a girl with the most brilliant mind and has no mercy, a 17 year old wizard that delights in bloodshed and manipulates people like chess pieces and a bloody, broken boy that's won their loyalty. He could've mistaken them for Death Eaters gone good but he was wrong.

Voldemort falls at the hands of the 17 year old trio.