Hogwarts Steps in

House of Black Returned

"Bellatrix, you may return to your business hours. Bill and Charlie, you may return to your work. Note to not just prepare for the mind of Albus but also a Gellert.", Lord Black first says as Bellatrix stares at him hard before quickly apparating away. Bill and Charlie pause as well before disappearing.

Harry turns back to the rest of his family. Expecting answers and questions from Narcissa.  Narcissa stares undaunted, "You are a young Lord but I am a seasoned Black. I want to know what you plan under threat of Grindelwald.".

Draco stares at his mother in horror. Gellert Grindelwald!! One of the most darkest wizards of the modern era! What the hell, Potter!

Lord Black pauses staring at Draco Malfoy  who sits clearly terrified to death next to his mother. Lord Black looks at the little scarred boy.

Draco Malfoy was groomed both by torture and love of Narcissa and Lucius. Groomed to be the "right hand" man of Voldemort.  Also learned of the terror and horrors of Grindelwald. To Draco, the true terror striking monster is him.

"Narcissa, please inform your heir of his position in your house and my gracious gift to him. He's never going to survive being Lucius's son. Draco Malfoy-Navaneeth, you are dismissed.", Lord Black declares harshly as the family magick violently grabs onto Draco. His body turning into particles of ash one by one until he vanished like a wild cracker back to Malfoy Manor.

There was a long pause of silence passed between Harry and Narcissa. Everyone stared at the two beings waiting for Narcissa or Harry to crack the tension. Ironically it was Harry, "He won't survive being Lucius's heir. It was the best way in the limited time to keep him quiet of this meeting place and make him start learning.".

Mellowed over by a simple fact and the fact that Lord Black didn't attempt killing her son, Narcissa heads straight to her point, "Grindelwald? Voldemort?".

Lord Black turns to Fredrick and George Potter-Black. George turns away as Fred utters out the truth, "He can't see anymore. Gellert. We have begun the right of conquests.".

Here's the tricky thing about draining magic from a magical. It's an abomination. It fundamentally breaks every single thing of what is scared of magic. Many who have even attempted such a deed, had their bloodlines cursed. Just as those who didn't properly cast dark magic or understand dark magical theory, were brought down with the curse of madness and decay.

Even those who rejected dark magic outright faced the same problem with light magic. Bill even hearing a word of their plot would be considered a war crime against nature itself.

The problem was light magic gone too far is dark magic. Dark magic going to far is literally Chaos Magic. The reason the Ancient Royal House of Black was so feared is the simple fact that their family magic was founded by a chaos mage who sought to destroy the very concept of Black magick.

Black Magick being a special type of chaos magic that dealt with manipulating reality. The entire idea of how is and what it shall become. What is the laws of this world and what is truth. That's how by magic the mage's house was decreed an Ancient Royal House. And also as a Black never fails, no one remembers what Black Magic even is.

The Blacks were feared as by legend and truth as they have turned Black Magic into their family magick. No one shall remember it except those who own the blood of the Ancient Royal House of Black. No one, besides those in of this house, even cast it without destroying themselves. Lord Blacks are the most feared as per tradition, they are the ones most trained in the family magic.

So when Harry James Potter discovered his heritage, there was no simple way to say other than the entire Wizarding World was fucked. Fate has no power over him anymore as Harry James Potter was trapped with nothing but the sentient magic of the Black House and Holly. All but too willing to teach him everything.