Amaranth was ready to embrace death at last after living for long. Many years since she defeated Voldemort.

But she didn't expect for herself to be reincarnated into a new life.

Or would be a hell?

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In a certain room in an old mansion, Cordelia was catching her breath after giving birth to 3 children at the same time. 

"Mistress, you have two sons and a daughter. The daughter has a lighter version of your hair color." a nurse said.

A daughter. She was able to have a daughter! Now this was something she could show off to her husband. 

She took a look at her newborns, specifically the daughter, and her eyes opened a bit.

They were a vibrant shade of green, greener than her own, and looked like they could shame the finest emeralds she'd ever seen. 

Oh! Her little girl would grow to be a heartbreaker with those eyes, she could feel it!

As her husband finally came into the room, she bounced to him, full of pride.

"Oh love! I have good news! We have two sons and a daughter. Our daughter is exceptionally beautiful. Come look at her!" 

-------

Karlheinz  didn't expect to gain two sons and a daughter. Rather three sons, like he planned. He seemed skeptical at first. Then he saw something on his new daughter's neck. It looked like a triangle with a circle in the middle with a line bisecting it. 

He had never seen this symbol before. What did it mean?

Then a doctor appeared to him with a look of shock and surprise on his face asking to talk to him.

"What is it?" 

"We just finished looking over the results for your new children. The sons have mostly inherited after you, but the girl is another story. She seems to have gained the vampire and founder genes from her mother."

....What?

"At least that's good news, your daughter will be immune to the Endzeit disease. And there's something else. We looked over the symbol on her neck, and one of our nurses recognize it. You see, the nurse was half-witch, and she said this is the symbol of the Deathly Hallows. The mark of the long lost Peverell Family. She also said it had been fortold that the legendary GWL, the Savior of the Wizarding World, and Mistress of Death would be reincarnated. And that's the mark that predicted she would be reincarnated as the being she is now." The doctor said catching Karlheinz by surprise. 

This...This is considered historic for vampires. A powerful witch reincarnated into a vampire, and in his clan among all others. And she's gained the founder gene to combat the Endzeit disease on top of that. 

This....

This could work. He thought as he smiled. Karl returned to Cordelia with his 'smile' in place and he lifted his wife surpising her.

"Cordelia, my love! You're a miracle worker. Our daugher has inherited the founder's gene from you. The clan has a fighting chance against the disease yet! And she's gained something more. The doctors said she's the reincarnation of the late Savior of the Wizarding World and she will regain her power with time. You've given me a future female heir worthy of the clan. A new future mother of a new race." Karl 'praised' his wife.

Cordelia, absorbing all of this information couldn't be more proud of herself. Happy that she was the one to give Karlheinz this joyful honor.

The daughter was named Diantha, meaning 'god-flower', as a nod from Karl that his daughter was a godsend. Her brothers were called Ayato and Laito; the former being the oldest, the latter the second-born, and the daughter as the youngest. 

Though a lot of things would change with this setting over time.

=============

Now there was some things about Diantha that was puzzling as time went by.

Unlike normal babies, she'd rarely cry, which Cordelia found as a relief in addition to the servants. She also developed a strange way of communication with the servants that she was hungry by tugging on clothing and mimicking eating food, as she couldn't talk yet. And when one servant was reading to the triplets, they noticed that Diantha was the only one listening with attentive ears. Some of the servants even wondered if the daughter was some kind of genius being the reincarnation of a powerful witch and all.

Next was her relationships within the family.

Having retained her memories and better judgement, Karlheinz reminded Diantha of Lucius Malfoy in a way. A gentle face hiding the harmful poison underneath. She only saw him the most as a baby. He rarely talked to her and her brothers, but it would mostly be directed towards her, saying she will be a 'great queen, a mother of a new race' one day. As she got older, she saw him less and less. She already knew she would be another one of his experiments.

Her new brothers; Ayato and Laito, although their mother was grooming Ayato to be the next male head, both boys were drawn to her and stuck to her like glue, when Ayato wasn't at his studies. Laito, having little of his mother's attention, would be at his sister's side most of the day. And with their sister's gentleness that Cordelia never gave them, it was hard for them not to like her.

Then there was her 3 half-brothers. It was hard to comprehend Subaru at first, but the sister would always find a way to comfort him because of how things were going between him and his mother Christa, who also was her dad's cousin. Vampire genetics and how they worked still baffled her. But Diantha had visited her once in her prison, and vowed that she would beat her father at his own game and free her brothers from him. And Christa did hear that promise before her life would end, so sadly, Diantha wouldn't know if she would be happy to hear that.

Shu was originally cheery back when they met, he even owned a cute puppy at one point. After Beatrix, his mother died, he didn't seem to care about competing to be the heir and would only listen to music all the time. The only time he wouldn't is when he'd listen to his sister talk, or even sing a little. 

Reiji was more of the figurehead of the siblings, something Diantha was grateful for since she was tired of always having to be the one looked up to the most in her past life. She really didn't have to worry about responsibility since she was well-behaved. Reiji allowed her to be around him as long as it didn't intervene in his studies at first. Then she would help him out on other things since she was the only female heir. He wouldn't show it, but Reiji was grateful for this. Back in their childhood, Reiji had little attention from his mother. Whenever Diantha could, she would read with Reiji, which he soon gained feelings for her.

Then there was Cordelia herself. Honestly, Diantha wished that Beatrix or even Christa was her birth mother. because of that woman's upbringing, she practically was full with pride, and lust. Especially since she would bring 'friends' over and try to teach her daughter how to show her love to others. But Diantha always refused to let herself sink to her level. She even saw how Cordelia treated her brothers apart from treating her like a trophy.

Apart from the family, Diantha did slowly regain her powers with time, but she had to be careful who she used them around. She would never hear the end of it from her mother boasting how powerful her daughter was.

As time passed, Diantha went from adorable to beautiful like her mother. The only difference was that Diantha had chastity that she intended to save for real love unlike Cordelia. She was even more disgusted with her own mother after what she did to Ayato to push him to be the best, and to Laito for her own sick amusement. But it was their sister that kept them holding on. 

It wouldn't take long for all the brothers to develop such emotions for their own sister. It was supposed to be wrong. Then again, Christa was their dad's cousin and being vampires they don't suffer from birth defect from such relationships. 

Their father knew this too, so he decided to let his children take things a step further. For the sake of his experiment.

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Well, I got interested in diabollik lovers as well, and decided a reincarnation/crossover with Harry Potter.

Plz comment and stay safe!