Serizechs watched the duel in growing horror as the still charred body of Issei started sprouting all four Kagune of the Purebloods of a House he was sure died in the Great War. He quickly looked around and spotting Ajuka his fellow Maou and known scientist and moved in almost a blur to his side, putting up a silencing barrier around them both. Ajuka was staring at the monitor in almost glee as Sezechs appeared.
"Is that what I think it is?" asked Serzechs asked quickly to his childhood friend, "How is that even possible?"
"It appears to be the creation of a new pure-blooded devil of the House Ghoul who, oh my, just absorbed the power of the Boosted Gear to finalize it's transformation," responded Ajuka with a look of almost manic glee as he checked a bunch of instruments he had manifested. "How he came to possess the organ responsible...that I might ask the one who delivered him here," he finished turning back toward his array of instruments.
Serzechs almost growled as he turned to Azezel and yanked him across the viewing party with his power of imagination. Azezel seemed surprised for a second seeing as he was enjoying the show but turned resigned with a smile as he saw where he ended up.
"Do you know what you have done?," hissed Serzechs as Azezel crossed his hastily made silencing barrier.
"Just thought I'd give my little friend a fighting chance," he quickly responded with an innocent smile as Serzechs scowled at him. "Even the odds a little."
"How many kagune sacs did you have?," asked Serzechs switching to damage control quickly after the clear admission. Better to get information now and punish later.
"Just the one, didn't know it would have this much of an effect honestly."
Ajuka quickly looked over, "One you said, just one, that doesn't make any sense unless...the boosted gear doubled the potential and forced it to evolve..." He quickly started tapping on his instruments as he turned back to the battle.
Serzechs sighed as he wished Serafall wasn't stalking her sister again on earth and was here to figure out how to play this to the millions of devils watching. He took down the barrier around himself but kept the one around Ajuka just in case his mumbling would make this harder to play off. Carefully considering ideas in his head he turned back to the monitor looking for how this battle would end.
The charred husk of Issei and his glowing Kagune slowly turned toward where Riser was facing away preparing for his victory speech. The husk slowly lifted its head and took a deep breath through its charred nose and smelled...
"Foooooood," With a sharp crack the devil tail on it's back sped toward Riser who turned hearing the wind move from what should be dead. Piercing through his back and out his stomach the kagune took quite a few organs with it.
"AHHHHHH WHAT THE," he screamed as the tip of the tail flattened itself and started pulling him back by the hole in his torso. Looking over his shoulder as he came to a stop mid air held up by his wings and the glowing tail still embedded into his stomach he started screaming. "You fucking MONSTER!, I'll teach you to attacAHHHHHH," he tried to say as the husk's kokaku devil wings sliced down thru his arms, while the rinkaku tentacles wrapped around the flesh and brought the arms to the mouth of the barely recognizable thing that once was Issei who started immediately tearing and ripping into its new meal.
Slowly the burnt husk started to change as the mangled flesh flaked off and showed a barely recognizable Issei missing his skin and most of his muscles, looking like a strung together skeleton. Ever so slowly as Issei ate and chopped off his opponents regenerating limbs to eat again he gained back his features while keeping an utterly deranged look on his face with those glowing green irises in pockets of void.
"So...," the bones cracked as he sipped at the marrow inside, "...hungry," Issei repeated cracking open another bone immediately after. Covered in gore Issei ate and chopped and ate and chopped, again and again, while Riser screamed and cursed in agony. Riser tried to burn him by releasing flames from his body, his hands, his feet, anything, but the positioning away from his body and the tail in his stomach that burnt a little but regenerated quickly stopped him over and over again.
A suddenly bright flash of fire forced Issei away from his meal as he jumped back and crouched low, ripping out his tail as Riser squealed, with his tentacles now waving dangerously behind him. "Stop hurting him," cried a teenage looking blonde with pigtails as she grabbed Riser who was slowly healing back but was almost babbling in pure agony.
Quickly Serzechs teleported himself and Ajuka behind Issei as the girl blinded him with another flash of fire as she teleported her brother away from the battle.
"Quickly," Serzechs said as Ajuka grabbed a syringe from his bag and gabed it into Issei's neck before Issei could react and bring apart the hasty plan Serzechs had made. As Ajuka took Issei he hastily teleported him to the hospital ward of Serzech's own home.
"The winner is Issei," shouted Serzechs as the magical televisions focused on him, "through interference forfeit by the Phenex Family." Quickly going through the pile of lies he was about to spew he reminded himself to threaten all the people who knew the truth after this. "It appears a truly marvelous thing has happened today," he smiled up at the audience he knew was still watching and listening intently, "a long lost part human heir to the House of Ghoul has through sheer force of will and the blessings of his Sacred Gear unlocked his Pureblood heritage. Of course taking into account the honored history of the abilities of House Ghoul of the 82 families he shall not be brought up on charges of acting as a stray. He was obviously overwhelmed by the sudden weight of his heritage. In recognition of this I, your Maou, Lord Serzechs, shall make sure he is properly trained in his peoples history and does not do any more distasteful stray actions outside of duels or necessary combat. Thank you for being part of this momentous honor duel and honoring our traditions with me, your honored Maou."
As the magical lenses stopped transmitting Serzech scowled and headed quickly to have a talk with Azezel before he weaseled away. All leaks needed to be reminded why he was so feared in the war to end all wars.