Nico Di Angelo goes to Hogwarts :)

Thats a plan

"You see?" he whispered. "It was a name I was already using at Hogwarts, to my most intimate friends only, of course. You think I was going to use my filthy Muggle father's name forever? I, in whose veins runs the blood of Salazar Slytherin himself, through my mother's side. I, keep the name of a foul, common Muggle, who abandoned me even before I was born, just because he found out his wife was a witch? No, Harry - I fashioned myself a new name, a name I knew wizards everywhere would one day fear to speak, when I had become the greatest sorcerer in the world!"

Harry's brain seemed to have jammed. He stared numbly at Riddle, at the orphaned boy who had grown up to murder Harry's own parents, and so many others... At last he forced himself to speak.

"You're not," he said, his quiet voice full of hatred.

"Not what?" snapped Riddle.

"Not the greatest sorcerer in the world," said Harry, breathing fast. "Sorry to disappoint you and all that, but the greatest wizard in the world is Albus Dumbledore. Everyone says so. Even when you were strong, you didn't dare try and take over at Hogwarts. Dumbledore saw through you when you were at school and he still frightens you now, wherever you're hiding these days--"

The smile had gone from Riddle's face, to be replaced by a very ugly look.

"Dumbledore's been driven out of this castle by the mere memory of me!" he hissed.

"He's not as gone as you might think!" Harry retorted. He was speaking at random, wanting to scare Riddle, wishing rather than believing it to be true.

"To business, Harry," said Riddle, still smiling broadly. "Twice - in your past, in my future - we have met. And twice I failed to kill you. How did you survive? Tell me everything. The longer you talk," he added softly, "the longer you stay alive."

It was clear Harry was thinking fast, weighing his chances. Riddle had the wand. It looked bad for him, all right... but the longer Riddle stood there, the more life was dwindling out of Ginny... and in the meantime, I noticed suddenly, Riddle's outline was becoming clearer, more solid... If it had to be a fight between us, better sooner than later.

"No one knows why you lost your powers when you attacked me," said Harry abruptly. "I don't know myself. But I know why you couldn't kill me. Because my mother died to save me. My common Muggle-born mother," he added, shaking with suppressed rage. "She stopped you killing me. And I've seen the real you, I saw you last year. You're a wreck. You're barely alive. That's where all your power got you. You're in hiding. You're ugly, you're foul--"

Riddle opened his mouth but froze. He had just caught sight of me. he closed his mouth and when he opened it again, he let out a burst of mirthless laughter.

"Nico Di Angelo. How are you... son?" I stared at him hatred evident in my pitch-black eyes.

"son?! You're his son?!" Harry yelled.

"well, I'm actually his grandson, but whatever."

"so- so this was a trap! You're working with him." Harry exclaimed, backing away from the two of us, trying to pull Ginny with him. I visibly flinched at that. Me, working with this nose-less git? As if. 

"Harry Potter." Riddle sighed a cruel smile etched on his face. "I work alone. I do not want an heir. I do not need one. I am immortal, no one will take my place. Your friend is an insult to me, as though I could ever die." he gave a short harsh laugh. I snorted, the gods were immortal, yet they still have heirs, this guy is getting a bit too cocky.

"my friend..." Harry said slowly. "you want to kill him." it was my turn to laugh now.

"well you got that wrong didn't you, Voldy? We ain't friends."

"either way, I will succeed. The three of you, will be dead by tonight. Your skeletons will rot in the chamber forever. But first things first, Harry."

He turned back to face Harry his face contorted. Then he forced it into an awful smile. "So, your mother died to save you. Yes, that's a powerful countercharm. I can see now... there is nothing special about you, after all. I wondered you see. There are strange likenesses between the three of us, after all. Even you must have noticed. all half-bloods, basically orphans, me and you Harry, raised by Muggles. Probably the only three Parselmouths to come to Hogwarts since the great Slytherin himself. We even look something alike... but after all, it was merely a lucky chance that saved you from me. That's all I wanted to know."
"Now, I'm going to teach you a little lesson. Let's match the powers of Lord Voldemort, Heir of Salazar Slytherin, against famous Harry Potter, and my own heir. Son of hades, legacy of Hecate.

Riddle made a strangled noise that I recognised as Parseltongue for: Speak to me, Slytherin, greatest of the four. I had to agree with him there.

Suddenly a door at the end of the hall burst open, and a huge snake slithered out, hissing angrily. The Basalisk.

"parseltongue won't help you now boys." riddle said as he strolled along, to a grand door, that was moving ever so slightly, as though someone was pounding it from the other side. at that moment, I found out exactly who was pounding it. Or should I say what.

Hundreds of Greek and roman monsters flooded the chamber, Dracaenae, Empousa, Ephialtes, Kampê, Karpoi. I couldn't even name them all.

"how did you even get these monsters? How do you even know what they are?" I asked riddle, practically shaking with anger.

"let me introduce myself, Voldemort, son of Hecate, legacy of Hermes." He took a short bow, and I turned to Harry who was looking petrified.

"well it looks like we got ourselves a fight." I yelled, over the noise. The monsters seemed to have stopped for a moment, taking orders from riddle, who was finding it hard to keep them in line.

"fight?!" Harry shouted, "we are out-gunned, out-manned, out-numbered, out-planned. We'll die."

"out-gunned? We don't need guns. As for out-manned and out-numbered," I grinned at Harry, placing my hands beside me, pushing them up slowly. Around two hundred skeletons rose steadily from the cracks I had created in the floor. there were still more monsters, but it gave us better chances. "and out planned? How could you think I don't have a plan?"

"you have a plan?" Harry asked hopefully.

"duh." I rolled my eyes, "warriors," I yelled to the skeleton army I had created, "attack everything, kill anything that gets in your way. Except me." Harry coughed, "uh yeah, except me Harry and Ginny."

"that is possibly the worst plan ever."

"I'm Greek. That's what Greeks call a plan. oh, and don't rely too much on the warriors. Once their broken they stay like that. The more I summon the weaker they are."

"I don't even know how to use a sword I think I'll just use magic." Harry said.

"magic won't work, so you better figure out how to use it or you'll lose your life, and more importantly mine!" I yelled.

"great." Harry muttered sarcastically. "I'll take the basalisk. You can have the rest of them." With that he raised his gold sword and charged at the basalisk. Wait- since when did he get a sword? I have more pressing things to worry about right now anyway, like my life.

I marched forward with my army and slashed at the monsters, left and right, whilst trying to keep an eye out for Harry, and of course Ginny who was lying close to death on the ground. Suddenly I couldn't see Harry anymore, and I slashed through the monsters, maybe around half of them gone, I looked around frantically for him, he must've gone into one of those tunnels.
No time to worry about that now, I thought as I continued to slash through the army.

If he died at least one of us could make it out alive.