How to defeat Voldemort step by step |Regulus Black|

Basically you are badass?

The members of the Order who witnessed the duel between Moody and Regulus started talking about it to the people who didn't have this opportunity. Meanwhile Regulus, who first asked Moody with look to don't spy on them with his magic eye, pulled Harry in his old room.

"What do you need help with?"

"Do you know how you survived the killing curse?"

"Professor Dumbledore said my mother sacrifice shielded me?" Harry said unsure.

"This may have been a factor but not only." Regulus sit on his old bed and motion to Harry to do the same. "You are a horcrox Harry Potter." He was talking on parsetongue.

"But—how?"

"He planned to make a horcrox that night, he started the ritual with killing one of your parents, he wanted to finish it with your death, but something happened. The killing curse somehow ricocheted. I don't know how, it may has been Lily's love, it may not. The important part is that his soul was cut in halves and one of them attached to the only living thing there. You. This is why your scar hurts, why you can speak parsetongue without spending years learning it and probably some other things you don't know about."

Harry believed his godfather's brother. It sounded absurdly, but it explained a lot of things. But if Harry was horcrox, does this mean Voldemort couldn't die unless Harry is dead too? He looked at Regulus without any fear in his eyes.

"You came here to kill me, didn't you?"

"If I can to get the horcrox out of you without killing you it'll be the best."

"If you can't I will be okay to die."

"Sirius and everyone down in the kitchen would kill me, not to mention my wife and Lily Potter. No, I found a way to get the horcrox out of you without killing you, but there is a little risk."

Regulus took out a little phial filled with something silver.

"Do you know what is this?" Harry shook his head. "Unicorn blood. It's tricky thing. If it's taken forcefully the user lives a cursed life. However, if it's given by unicorn it could save lives just like Phoenix's tears. It's one of the purest substance on the planet."

Harry had heard what happens if you drink unicorn blood. He didn't know it could save someone, but Regulus seemed genuinely.

"I'm going to ask you if I could conjure cursed fire and burn little part of your skin, so I would be able to get the part of the Voldemort's soul out of you and I will gave you the phial. When the black smoke that will come stops, you have to put a drop of the unicorn blood on the place I have burned you."

"And you are sure I'm not going to die?"

"98%."

"Go on."

Regulus conjured the fire and made a little hole in Harry's skin. Black smoke started coming out. Regulus didn't let it fly away, he destroyed it company with the cursed fire. When the smoke stopped coming, Harry put a drop unicorn blood on the burn. Regulus made sure there wasn't any smoke before he stopped the fire.

"To make sure everything is ok I will say something on parsetongue, if you don't understand the horcrox is destroyed."
Regulus made strange hissing noise, probably parsetongue, but Harry couldn't understand. They smiled.

"Now I have to kill Nagini." Regulus said. "I have a plan."

"I would love to hear it. Now I understand why you wanted to tell me first."

"That's good. Be careful to who you tell, it's not going to be taken easily."

"I will, but I think I will tell Sirius when everything is over. And Ron and Hermione, they deserve to know."

"It's your choice."

When they returned everyone were talking. Sirius immediately asked.

"So, Harry, what did my brother want?"

"Your brother is here." muttered Regulus.

"I will tell you some other time."

"But—"

"It's my choice."

"Okay."

The golden trio put heads together to talk. Sirius returned to his conversation with Remus. In the meantime, Moody and Regulus were talking to set when they would duel. Tonks interrupted them.

"What do you want Nymphadora?" growled Moody.

"It's Tonks." she turned to Regulus. "To put it short, you are badass ex-death-eater with turquoise hair, who found a way to kill Voldemort, faked his own death and broke in Gringotts actually managing to steal something."

"Yes."

"And we are something like cousins?"

"Yes, something like cousins."

"Cool."

Sorry, it's kind of short. What do you think?