Everyone gathered within their academy that was radiant an absurd amount of horrifying power. The strange thing no one was able to sense this beacon of power across the world. As if only a select few are capable of feeling this dread.
"This will be troublesome. Kokabiel truly able to meet with the dark apostle"
Issei stood looking at the miasmic terror before his eyes. It was the clear indication of the dark apostle dimensional locked which is the [Infinite seal] the place was bickering him to enter but it was simply a trap.
"This is certainly a bold action. Issei, we need to plan this carefully before doing any action."(Sona)
"I know but they would remain here until I get inside. We can't wait for them to remove this barrier."
"I agree this would endanger the townspeople if they succeed in whatever they are planning inside."(Rias)
"Irene and Albion along with Crimsyn (Great red) and Ophis, Please maintain a powerful barrier to ensure none of the humans to be affected. The rest excluding Sona peerage follow me inside."
Issei summons his boosted gear and quickly transforms into his Diabolos Dragon God form while Vali did the same with her Diabolos Dragon Lucifer. He turn to looked at each of his woman which exclude Yasaka and Kunou who remain at their home to protect his parent just in case.
"Balance breaker!"
Issei had given each of his lover a simple Sacred gear that gave them Scale mail armor for added defenses and increase their power. Rias wore an armor similar to his Diabolos Dragon God mode but in female form. It didn't have any other ability beside his boost, transfer and Penerate with the addition of increasing her destruction potency.
Yuumi wore a female armor dress that radiate both holy and demonic aura. The armor appeared to be a more heroic look than his old demiurge armor. She held her True Excalibur that Issei able to replicate due his connection with holy aura.
Valerie wore a Valkyrie theme armor that envelope her whole body as behind her were dark misty wings. Meanwhile her best friend, Gasper had similar armor but in pitch black color.
Akeno had similar armor as Rias but was black in color with golden streamline and sparking in lighting. She had weapon which was whip sword blade that had ridges that can extend to be a whip.
Koneko and Kuroka wore a long flowing kimono that had golden halo behind them and floating orbs that able to increase the speed of their Senjutsu enabling them to have power offense and defense. Irina and Xenovia had angelic armor given them an immense boost over their weapon.
Asia wore pristiest garb that gave her pure goddess auara as she held a staff thay Issei created for her. it allowed her to temporary remove any damage to those have ill intent. though, it depends in her opponents power yet it needed to a extremely powerful enemy.
Sona had scale mail which is water that envelope her whole body then becoming solid Valkyrie style armor while her Vice President, Tsubaki receive samurai motif armor allowed her [Mirror Alice] to be used multiple times and even used with her weapon.
Lastly is Raynare who still had her skimpy outfit but had bits of armor that increase her light and holy magic. She had gain six wings due to her training with Issei.
The rest of her peerage remain as they were far too weak to go. Unlike some and Tsubaki who had strong connection with Issei that enable them to grow faster. Saji had the rest of the peerage affection for plot convenient because the author is lazy to remember their names.
Issei observe her lovers who used the experimental sacred gear that he mentally note things to improve. He then notice Raynare distress afraid that what Kokabiel did to her brother.
"Are you alright Raynare?"
"Ah n-no I'm scared what will happened to my brother since i know Kokabiel will used him knowing his unique trait."
"Your brother would be troublesome to fight but don't worry ill try to immediately save him if I saw him."
"I know you will but be careful. If Kokabiel did something to him then his power would be exponential."
"You don't need to afraid. We'll kick that crow butt."(Koneko)
"I understand your worry since I have an older sibling but we will save your brother this time and defeat him."(Rias)
"Fufufu I'm excited to finally used this and tor-I mean punish Kokabiel."(Akeno)
"That Valper galilei will pay once again." (Yuumi)
Issei asked if he should revive her friends but decline since they already pass on and it would be her selfish wish to revive them. Though it didn't replace her hatred toward valper and the people behind it.
Fortunately, Diablo had gathered enough evidences at the cruel action of the Vatican to be use in the peace treaty. Issei needed to visit hell and capture Hades for experiment since the dark apostle doesn't have any plan on joining with him.
He plan to enslave him and be royal only to him since it would be a waste to kill him. Meanwhile, Thanatos will have the same treatment. Once he finish kokabiel then Hades and Thanatos will meet their end.
Issei already plan to visit Cao Cao and his group challenge them since he knows that their leader is man who has great pride. He can knock some sense to the man who's playing hero.
"Come to me [Ayin]!"
Issei summon his other sacred gear, it appeared to be crimson colored two prong spear that could grew in size and length. It hover over his shoulder ready to strike any enemy down.
"Alright lets gets inside."
Passing through the miasmic barrier all of them met with true nightmare. Everyone instinctually evaded a powerful swear that create a small ravine. Issei quickly shot dozen of dragon shot to the source but it was slice through like butter.
They all stood in shocked seeing Kokabiel sitting down on his throne with two individual beside it. One had hooded robe covering everything and only see its lower jaw which was definitely a woman while the other is demonic monstrous creature with left hand being enormous containing three reptilian fingers and right held terrifying enormous blade that had giant eyes staring intently at them.
"Welcome young devils! Ive been expecting all of you!? I didn't expect you would defeat me in another timeline."
Kokabiel spoke much more menacing as if they were all in the palm of his hand. They didn't even take the time to analyze when the monstrous appeared before them swinging its enormous blade at Issei who manage to block it with Ayin but it blew everyone away.
Issei quickly used his spear to lower his enemy weapon to the ground then tried to pierce the creature who mange to redirect his strike then Kick Issei pushing him back. He was surprise creature could move that fast and quickly increase his speed.
"Everyone go I'll handle this guy!"
He used telepathy to inform them and quickly put his attention the demonic creature who keep up with Issei. They both used their weapon to wound each other but it was stalemate as both able to deflect every strike.
[BOOST! BOOST! BOOST! BOOST!]
Issei used his boost to multiply his power moving thousand times than the speed of light but the monster kept growing in power. He then realize who he was fighting and bitterly groin.
"Dammit, I can't used [Ayin] on him or Raynare would be sad. I need to ware him down and take his blade away from him."
He quickly remove his Spear then his body burst in golden flames like a Phenex. It was uriel holy flames that could increase someone physical attribute immensely. Issei did simple palm strike but it cause everything around them to obliterate blowing the Nightmare hundred kilometer away from him.
Issei observe the result and was about to move but he quickly notice his body was slice in countless places. The nightmare was once again in front him with its body healing the damage.
"Don't get cocky just because you manage scratch me."
Issei Immortality kicks in regeneration his body then once his arm grow back clench it then strike demonic creature straight to the face slamming his head through the ground. He pinned the body with his feet then stared intently at the creature with his eyes glowed in golden hue and Crimson cross could be seen.
"How dare you possess my brother in laws body?"
Issei felt danger and back away when the creature entered a frenzy state but he only remain indifferent while summoning dozen of magic circle.
"Well lets see what you can do!"