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Alright, let's see. I didn't call her Serafall Gremory; there's a reason for that.
This is Alternative Universe.
Serafall's father is Lucifer, leader of the entire devils race.
There's only one Satans title as he fought on a different side in the civil war, which was also different.
Serafall is the same as her cannon counterpart beside the crimson red hair and eyes (like Millicas Gremory), which inherited from Gremory line. Rias Gremory is her aunt, obviously.
Along with her Sitri's Ice magic, she also can use the Power of Destruction from Bael's side.
Unfortunately, her mastery in it could not destroy black ice, which tent to be nigh indestructible for seven days and nights.
Lucifer forgot to dispel it on Serafall as he was in panic and she probably bleed out a lot quicker if he did that.
Lucifer = Black Ice, Leviathan = Black Flames, and the Twins = Black Winds.
The last one is like the power of destruction, except it last for seven days and nights.
Just think Rasenshuriken, bombarding the same spot for an entire week.
Lucifer is 12 years old. Leviathan is 11 years old. Serafall is 11 years old. She's older than Leviathan, but younger than Lucifer, her brother. The Twins is 10 years old.
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Serafall opened her eyes slowly, seeing the white ceiling above.
She blinked, wondering where she currently was.
What was the last thing she remembered? Dozens of black ice shards were flying at her with the malicious intents.
She tried to destroy them with her power of destruction after they managed to penetrate her personal ice barrier.
Unfortunately, even that didn't work.
What were those ice made of? She thought.
"How are you feeling?" A soft voice asked.
It was a quite feminine like her mother, but unfamiliar.
The red-haired girl turned her head slowly to the side, seeing a silver-haired matured woman with matching set of eyes gazing back at her.
Concerned eyes, they were.
She opened her mouth to speak, but found her throat was dry.
She nodded instead as a smile formed on the woman's face. It was a heart-warming smile like a concerned parent.
"That's good to hear, Serafall. My name is Grayfia," Grayfia greeted.
Serafall was about to say something, but the Grayfia stopped the girl's attempt with a hand gesture.
She then looked across the bed and over the girl's body to the opposite side.
"Lucifer, please get Serafall a glass of water," Grayfia requested.
"Right away, mum," a familiar voice acknowledged from behind.
Serafall blinked, remembering whose voice it was. It was that boy she just met. His name was Lucifer?
She thought it was a joke initially.
Serafall slowly turned to the opposite direction and saw the boy running back to her with a glass of water.
There was also a silver-haired girl with braided blond strands standing next to her bed, staring back at her. The girl was about her age.
"Here you go, Sera-chan," Lucifer said, offering the water.
Serafall moved a hand up. She tried to accept it but froze up when seeing her body was bandaged all over.
Some of wrapping seemed to be colourful instead of plain white.
She then sat upright with Grayfia's assistance while Lucifer helped her consumed the much-needed liquid.
However, while that was going on, the silver-haired child in the room was still glaring as if she had taken something important, or maybe she did something wrong.
Serafall didn't know which as she drank from the glass eagerly to quench her thirst.
Afterwards, she returned back to the previous posture, lying down.