The Lightning's Castle, August 10th, 1999

The Lightning sat on his dark throne on the dark blue and silver rug on the charcoal granite floor. There was a dark blue rug that stretched across his throne room that led to the throne. Hanging on the granite walls were dark blue and silver banners with the Lightning's thunderbolt logo on them. The Lightning, who appeared as a bald black bearded man in a dark blue robe was looking through his book of demons to find which one to summon.

"So many demons, so little time." The Lightning said to himself. If I want to take over this world, I need to mind control the wizards of Hogwarts to worship me, but what demon to use?" The Lightning was scratching his head, while his white butler with grey hair and a monocle arrived.

"Your tarot cards, sir!" The Lightning's butler named Charlie said. Lightning took the cards and cast a spell with his mind to shuffle the cards. The cards revealed the demon known as KnightMage.

"KnightMage, perfect!" The Lighting said. KnightMage showed up, appearing like the Black Knight from Fire Emblem only with horns on his helmet, dark blue armor and no cape. KnightMage sprouted wings and flew on his way to Hogwarts.

Hogwarts, 1999

The school year of Hogwarts was beginning, as McGonagall began the opening ceremony.

"As we begin our second year after Voldemort was defeated, I would like to announce our new faces at Hogwarts." She explained. "Teaching Muggle Studies is Roy Mustang, who is from the Eastern European nation of Amestris." Roy stood up, wearing his black suit that he wore to visit Madame Christmas. The new students clapped.

"Thank you all." Mustang said.

"Teaching History of Magic is a heroine of the Battle of Hogwarts, Mrs. Hermione Granger!" Hermione stood up, wearing a grey blazer over a pink shirt. The Gryffindors, Hufflepuffs and Ravenclaws clapped, but the Slytherins did not.

"We also have a Weasley's Wizard Wheezes store in the castle, and its owner is none other than Ronald Weasley!" Ron stood up, appearing in his charcoal grey jacket with a scarlet red shirt.

"And finally, the Defense Against the Dark Arts Teacher is Harry…" Harry was not present, instead it was KnightMage, who stood up.

"It is an honor to be your Defensive spells teacher." KnightMage said in his foul, villainous voice. "It will be a great honor to train these students in battle." KnightMage left the Great Hall when the ceremony closed to bring about his wicked scheme.

In the Defense Against the Dark Arts classroom, the new students were talking amongst themselves until KnightMage teleported into the room.

"Good morning, class." The dark knight greeted.

"Good morning, Professor KnightMage." The class said in unison.

"A wizard's bread and butter is stunning." KnightMage explained. "Use the Stupefy spell to counter my attacks." The KnightMage pulled out his magical sword, charging at a Latino Ravenclaw student with long curly black hair and green eyes.

"Stupefy!" The girl said. She did a magic blast to knock him over. He got up.

"Impressive." KnightMage said. "Tell me your name."

"Gina Vasquez." the girl said. "I am an exchange student from Columbia."

"How interesting." KnightMage said. "But can you dodge this!" KnightMage used his magical sword to shoot a blue beam of light towards Gina. She countered with a red beam of light, as the beams connected.

"Concentrate…" KnightMage advised. "Focus." Gina's red beam absorbed KnightMage's blue beam, and it sent KnightMage flying backward.

"Well done." KnightMage said. "Next!" A transgender female Slytherin student with long black hair, blue eyes, and red lipstick showed up.

"Hi, I am Stacy McConnelly, a Slytherin of Irish descent!" Stacy said in her Irish accent which sounded very masculine.

"Try this on for size." KnightMage said. KnightMage attempted to attack Stacy, but she used the Stupefy curse to stun KnightMage. KnightMage was flipped over by Stacy's wand blast charm.

"Next!" The last to step up to the plate was a black student by the name of Leon, who was a Slytherin.

"Interesting." KnightMage said. "You remind me of your father, the Lightning." KnightMage had begun to shoot a blue light beam from his sword, but Leon countered with a purple beam of light coming from his wand.

"Such power." KnightMage said. "As the Lightning's Son he would be a great soldier of his father." Leon's purple light beam absorbed KnightMage's blue light beam, and made KnightMage fall over.

"That's the end of the lesson." KnightMage said. "Applications are available for those who want to join the Lightning's Grand Army." Leon pointed his wand at KnightMage.

"You have no idea what my father did to me." Leon said.

"Wand away!" KnightMage suggested.

"No!" Leon protested. "The Lightning left me with this scar on my forehead." Leon took the bandage off his forehead and revealed a lightning bolt scar similar to Harry's.

"He gave me that after I had stepped out of line." Leon remembered what happened that day.

Lightning's Castle, 1996

Lightning and his Thunder Generals were in a war room, making their plans for the Battle of Hogwarts.

"We may have lost the war in Amestris, but we have just acquired Hogwarts and the British Ministry with Snape and Voldemort as our pawns." The Lightning's General, Lester said. "We need to send the Malfoy Family into battle to defend the homeland for our beloved Lightning Empire."

"The Malfoy Family loves and defends our empire!" Leon said. "We can't throw them away like that!" Leon interjected.

"LEON!" Lester snapped. "By speaking out of turn and interrupting the plan, you have not just disrespected me, but you have disrespected the Lightning."

"Exactly, Lester." The Lightning said. "We will duel outside as punishment." After the war meeting, Leon and the Lighting began to duel in the courtyard.

At the courtyard, the Lightning's demons and the generals sat in the stands, along with Leon's sister, a black woman with a black afro of some sort. Leon and the Lightning drew their wands, and began to duel. Leon shot a purple beam of light at the Lightning, but he countered with his blue beam of light. The Lightning summoned some dark shadows with eyes, reminiscent of Pride, the Homunculus who was the Fuhrer's son in Amestris. He strangled Leon with the dark shadows and aimed his wand at Leon.

"You shall learn respect." The Lightning said. "If you think you can lead better than me, I shall prove it to you by sealing half my soul inside you." The Lightning used the same spell Voldemort used to seal a piece of his soul inside Harry by sealing half his soul in Leon. Leon's sister made a satisfactory smile, meaning she was satisfied that Leon was feeling torment.

Present Day

"He disowned me after that and forced me to roam the world with this lesson on my head." Leon said. "You will perish for siding with a crooked man!"

"CRUCIO!" KnightMage used the torture curse on Leon with his sword, torturing him.

"What is going on here?" Molly Weasley, the assistant headmaster said.

"I am teaching, go away." KnightMage said.

"Expelliarmus!" Molly snapped, disarming KnightMage. "We never use torture as a punishment!" Molly was furious. "Professor McGonagall should have let you know by now. And since you were using the Crucio curse, one of the three Unforgivable Curses, I am going to call Kingsley of the Ministry and he will send you straight to Azkaban." Molly went to send a letter to Kingsley, writing it. She put it in an envelope and sent it to Errol so he could deliver it to Kingsley.

A week had passed, and Kingsley had got the letter. Errol flew back to Molly after dropping the letter off at his office. He opened the letter and sent his team of Aurors to arrest KnightMage.

KnightMage was in his office, sipping his tea when there was a knock at the door.

"KnightMage, this is the DMLE, come out with your hands up!" A random Auror said. Harry unlocked the door, now seen in a black coat with black pants and a red shirt.

"Harry Potter, Head of Auror Office." Harry said. "You're under arrest!" Harry used the Incarceous spell to bind KnightMage's hands together.

"Take him away." Harry ordered.

"Yea, take him away!" A Jamaican-British Auror added. The Aurors transported him to the Ministry where he would stand trial before prison. Leon came in to see Harry.

"Hello, little guy." Harry said. "That scar, it looks familiar."

"I am Leon, the son of the Lightning." Leon said. Harry looked at the emerald green striped tie he was wearing, and realized something.

"You're a Slytherin!" Harry said. "I was once called the Heir of Slytherin, but now I believe it's time to pass the torch."

"Ever since Voldemort's defeat and the collapse of the Death Eaters, Slytherins are still shunned because of the old wounds of Voldemort's reign." Leon explained.

"As the new heir of Slytherin, you will lead Slytherin House on its road to redemption." Harry promised.

"Really?" Leon said.

"Indeed." Harry said.

"Thanks!" Leon cheered. "The Lightning actually belonged to no Hogwarts house, because his existence predates Hogwarts."

"You're the Lightning's son, I presume?" Harry asked.

"Yes, I am." Leon said.

"I will lead you on the path to redemption on a journey that the two of us will go on, together."

"I like that." Leon said.

"I spoke to McGonagall, and this journey will count as class credit." Harry said. He held Leon's hand, and they used the Portkey to go to a distant location.