Benihime, wearing a white v-neck shirt, blue skinny jeans, and a fox mask over her face, stepped away from the coffin while carrying her katana. Kisuke followed her to ask her for the complete story first before examining the coffin because he found Benihime's seal on it while also leaving Le Fay to reinforce and remove the traces of the summoning.
"What exactly is that?... No... Since it's a coffin, who exactly is that?" asked Kisuke while analyzing the Demonic Power that's coming off from it, 'It's unusually dense but also a bit different that of normal Demonic Power?'
"I don't know." Benihime shrugged her shoulders, "When I arrived, some of Hades' men seemed to be extracting blood samples from it. I took a peek and the only thing I could figure out was that it was a woman. I'm not really sure if she's a Devil despite all of that Demonic Power, and the most surprising of all was that she's still alive, even though her body was already half decayed. It must be an agonizing torture to be kept alive that way."
Kisuke thought about it for a moment while Benihime was unsealing the coffin from her position and a certain person came to mind, which made him open his eyes wide, 'Could it be!?'
"Benihime, don't release the seal!" Kisuke turned around and saw that Riveria approached the coffin out of curiosity while no one else did because they were still in their defensive position, "Riveria!"
Riveria stopped her steps and turned around with confusion, however, Kisuke couldn't continue his words when a mass of Demonic Power exploded under them, crushing through all the floors and arriving in the hall. A young-looking beautiful woman with lavender eyes and bright crimson eyes tied in a two-sided updo and a small crown-like accessory on the top of her head.
"P-Progenitor!?" Zeoticus exclaimed upon seeing the woman covered with a very dense crimson Demonic Power that's only second to what a Super Devil could emit.
However, the newcomer ignored his call and only set her eyes upon the coffin with great concern reflected on her eyes. And upon seeing Riveria who was closest to it, she immediately marked her a threat to the coffin and instantly took action. Instead of a normal set of Devil Wings, hers was made from pure crimson Demonic Power that she emitted. These crimson wings then flapped, instantly propelling her forward in an attempt to remove the threat.
All of a sudden, a man with pale blonde hair wearing an oriental outfit appeared in front of the green-haired Elf. However, that didn't matter as he was only added to the list of threats. Extending her hand out, it was covered by her Demonic Power and formed into a set of large claws that was in no way inferior to Crom's or maybe even sharper.
Everyone else in the room tried to take action with Issei even going straight into his Cardinal Crimson Promotion form, Vali into his Empireo Juggernaut Overdrive mode, and Vasco releasing a massive amount of Holy Power in an attempt to stop the clash. But even then, they were already too late and saw Kisuke sighing to himself.
It wouldn't be wrong to say that he was pissed, however, not at the incoming enemy, but at his own inadequacy. He'd already promised Riveria's protection and safety and he wasn't even bringing her anywhere dangerous, yet here he is, blocking an attack that would instantly kill her when something like this shouldn't happen in the first place.
With that brief frustration taking over within him for an instant, he ended up going a bit overboard.
As Kisuke took a stance to throw a punch, the sclera of his eyes turned black and his pupils golden with a single angular horn sprouting on the right side of his head. His hair also grew longer along with the right half of his body being covered with Hollow matter, transforming his right arm into something more monstrous.
Everyone was speechless with his sudden transformation, however, he's still not done as five 'blood drums' linked together appeared behind him, with three of them instantly opened into 'eyes', abruptly spreading out an immense oppressive aura in all directions.
Grayfia, Zeoticus, and Venelana hurriedly deployed multiple barriers to protect everyone and those who could still move also did the same. Issei still wanted to jump in to stop them, but he was stopped by Vali and Vasco who both had cold sweat drenching their backs.
After being drowned with Kisuke's killing intent and pressure, the crimson-haired girl finally fully woke up and realized what she was doing. And when she saw the man in front of her gathering something extremely dangerous in his transformed hand, she stopped her flight in panic and yelled surrender, "W-wait!!! Stop! Stop!!!"
Not just those around, but even Kisuke was taken aback by her sudden change in demeanor that resembled that of a child, '...What?'
Kisuke was confused because she didn't seem to be acting and he was pretty confident in his ability to read expressions, "I won't attack! I'm stopping now! So let's have a truce! Please put that dangerous thing away! It's scary!"
While the girl landed her feet on the ground, Kisuke also slowly retracted the Gran Ray Cero he'd been gathering in his right hand that he wanted to use to blast her into nonexistence, '...She looks like a kid... She acts like a kid... I can't really hit a kid without a better reason, can I?'
Unlike Serafall, who had a pronounced childish side to her, the one in front of him was undeniably childish, which doesn't make sense, 'He called her Progenitor, didn't he? Then the one in the coffin is really...'
If Kisuke's guess was correct, then he could understand the actions of the girl in front of him.
The girl sighed in relief but didn't dare approach him any further, "W-who are you?"
But Kisuke stayed silent with his transformation spreading slowly throughout his whole body as he continued to stare down the girl.
Kisuke's heavy intimidation didn't just work on the girl, but on all of those around him. But even with a palpitating heart, Zeoticus had to do something, or at least say something to defuse the situation. Although, before he could step up, another young woman with ponytailed crimson hair silently appeared beside them and blocked him with her arm, "M-mother?"
"Let them be. Just focus on protecting Milicas and Venelana.", replied the woman.
Zeoticus wanted to object but he trusted his mother's judgment in the end, 'Just why did she wake up now? Is it because of that coffin?', he asked himself while looking at the confrontation.
"Ummm... Hello?", asked the girl in front of Kisuke, "B-big brother, who are you?"
The members of the Gremory family except for Milicas almost retorted, but they were able to collectively calm themselves, partly thanks to the scary aura coming off of Kisuke.
As Kisuke's second horn fully formed and the other half of his body became fully white, he finally answered, "Shouldn't you be saying something first?"
The girl thought for a bit before realizing it, "Ah... Where're my manners? I sincerely apologize for attacking first, big brother. I'm Runeas Gremory." She introduced herself before pointing towards the coffin behind him, "And the one behind you is my mother."
Those who already knew who Runeas was were stunned at her announcement.
"Runeas? Why does that name sound familiar?" asked Crom, who'd already returned to his human form.
"Runeas Gremory, the original Gremory.", answered Vasco who didn't ease up.
"T-the original Gremory? That's Rias' ancestor? So she's still alive...", muttered Issei, but then he recalled what she'd just said, "W-wait. Her mother? T-then inside that coffin is..."
"There's only one mother all of the 72 original Devils ever knew." Vali sighed while also taking back his armor, trying to withstand Kisuke's pressure dryly, "Should I say that as expected of his companion? To just swipe the coffin containing the mother of all Devils and my great-grandmother."
"Lilith..." muttered Issei.
However, that wasn't the most interesting thing for Vasco, "More importantly, what is Kisuke Urahara?"
A smile flashed across Crom's face and said, "Who knows? Only one thing that I'm sure of is that he has been holding back."