The deal between Shinji and the satans was finalized. Ironclad are the rules, but it took some time of debate, and now it led to Shinji and Sakura following the satans to the underworld near the parliament building. On the governmental grounds was a facility to train in combat, and the situation was strange in the Lucifers eyes.
"Run this part through again" asked Sirzechs as Shinji explained this part of the contract. "Basically, I want you to use your abilities in front of me, all satans if possible" said Shinji, and while they were from different worlds, he failed to see how this plan of his would work. "But how would you use it, its a clan trait and your human so you don't have demonic power" Sirzechs pointed out.
He wasn't wrong, Shinji was human but he was a different human than the rest. If we were to come up with a term for this different human would be Essence Human, or Homo Essentia if you wanna make it scientific. Shinji was prepared for this, and made good use of the DNA samples he was given by the occult research club.
The red head, whome he latter learned was called Rias Gremory of the Gremory line, the source of his new found energy which was already as large as a planet, and was expanding and catching up to his own reserves of Od, internal magical energy.
"Don't worry, my abilities will handle it" Shinji declared with a smile, and the nearby satans were still confused on how it works, seeing as how the ability to learn new abilities of different races seemed like something that belongs to the Sephiroth Graal or a potential sacred gear containing the Yamato-no-Orochi.
Shinji digged deep within himself as he found the other energy. To him it seemed red and the feel of demons was upon it. He began to agitate it and summoned it forth, only a fraction to preserve the surrounding area, and the aura he began to emit was one of great, yet restrained power.
The eyes of the Satan widened at the impossible display before them. He was human, that they were sure of, but how did he gain demonic powers. They know he said that he had an ability that allowed him to copy powers, but energy too? It all seemed confusing to them. Ajuka was analyzing every detail, but he was saving his trump card for the demonstration.
"Alright, lets begin with mine" said Serafall, as that was how the satans planned it. Since her ability seems more simple in nature, it would be a good testing ground for how far his ability could go. Gazing to the side, he saw the waitress Sakura watching with some muted interest. He had a bad feeling about something, but shook his head as it was probably nothing.
Unlike the rest of her clan, the Sitri, Serafall specializes in ice manipulation. Her abilities were so powerful she could freeze an entire region of the underworld if she went all out. Serafall was dressed more professionally this time and she raised her hand and called forth her demonic power. An aura of blue formed around her as a magic formula with the seal of the Sitri formed in front of her.
Her demonic power surged and began to coagulate into ice. Shinji was pushing his analysis to the extreme and was capturing every detail from the movement to even the formation of the ice on a molecular level. Shinji raised his own hand, and his own demonic power surged as a perfect replication of Serafalls ice magic appeared in his hand.
The devils marveled at this ability to learn any magic ability, and the fact it could be used this way offered many different oppurtunities. "I guess I'm next" said Ajuka as he stepped forward and summoned his Kankara Formula. It was a power that specialized in creation, and was often known as the formula of military supremacy.
It allowed him to affect the world through calculations of the laws and logic of the world, done by filling in the equations of these phenomena with demonic power. The demonic power itself is quite complex, but not to complex for Shinji. His abilities were on overdrive, even if he didn't really need it, it was always smart to bolster your arsenal. Better to have it and not need it, than need it and not have it.
Shinji easily manifested the formula and was able to figure the equations surrounding the world with ease. Perhaps he was a pure definition of genius, or maybe he is an anomaly in the world, and the satans were more aligned with the later opinion.
"Monster" muttered Serafall mutely, and she was surely right. His powers were simply to monstrous for them to comprehend. It was akin to an impossibility made manifest in the world. 'Im not sure I feel good giving away the power of destruction so easily' thought Sirzechs, but a contract was a contract and he was an honorable man, as long as the person itself was good.
Sirzechs stepped forward as a red and black aura manifested around himself. It was the concept of destruction personified and was a signature move of the Bael clan. Sirzechs power was on a whole nother level, and it showed with how much power and control he had over it as he fired a small blast towards a large straw doll, reinforced with enhancement magic, and it was completely annihilated.
'interesting' thought Shinji, as he was analyzing the phenomena with both the formula and his own assessment power. It seemingly ate through the magic and even seemed to go deeper. Shinji had all sorts of ideas for this power as a sphere of red and black manifested on his finger. He formed the gesture of a gun, and shot the bullets and the power ravaged the straw dummies, leaving nothing left like the Lucifer besides him.