Issei wore a black skintight sleeveless shirt as it was his training clothes as his battle attire is only for its purposed. He began to focus as his right arm was consumed by darkness and red veins. It was his [Azure Grimoire] the additional sacred gear he receives from creating [Blood Scythe]
He found that the arm was capable of controlling shadows as it grew in size and with simple claw slashed slices the artificial mountains. The arm was capable of growing stronger the more soul it devours but due to the places being only an artificial world couldn't sustain souls in the plants and trees. The stronger the soul the better.
Issei was able to summon a dark dragon from each swipe of his arm and after having few tests run with his hands tried doing a balance breaker being enveloped by black darkness with red lines then five serpentines appeared behind him along with a red dragon tail.
The strength it gave him was similar to Diabolos Dragon God but much more violent. Its only advantage was it devours the soul and grows stronger.
He then summons his [Blood scythe] and felt perfect much. The weapon didn't have any balance breaker as the [Azure Grimoire] already provide it. With a ssimple sword, slash was able to cut the edge of the training grounds.
'I wonder if the countless souls I took can be placed? Oh wait!*
Issei brought out Sephiroth Graal from his new ability called [Sacred Gate] where it contains all sacred gear. He tried to find the tormented soul as it would be a waste for them to remained unused. Though, he walked the path of righteous doesn't mean his an ally of jjjustice. What he walked are the path where it benefits the innocent and those he holds dear. Another partis his Guidance.
He began to devour the soul relishing the taste as it making him drunk at how delicious it was but Issei maintain his sanity. Issei could grow stronger than before but it was minuscule and only the vilest gave him better nourishment.
'Not bad, I need Dark apostle who is twisted to grow stronger.'
Issei stopped as most souls can reincarnate to the next life and it would break the balance of the world. He knew how to create soul but Issei didn't need to test it to know that the taste will be bland. He tried summoning his Diabolos dragon god armor mixing with the [Azure Grimoire].
He was surprised nothing happened and concluded that due to having the perfect sacred gear system that he had full control over it. Issei new looked was pitch black with red lines in the shape of Diabolos Dragon God.
'But it does consume massive Stamina that even my soul is feeling the strain.'
Issei quickly stopped as it would result in his soul if he tried fusing the two. It was better to train both separately to ensure better control like his [Nephilim Dragon God] which was the fusion of True Angel and True devil side. He hadn't tried using it on combat yet but Issei was able to maintain the form for more than a minute and it was a trump card that would leave him open for several days.
This is the reason, he hadn't tried to continue train die fearing the outer gods might be planning something. Issei receive a call from Ajuka informing him about the finished product in turning his woman into a dragon. He replied about going the next day.
'Nice but who should I bring? Ravel is must but who else? Maybe le day and Jeanne since their knew. I might meet up with Serafall along the way.'
Issei got out of the training room and head straight to the bathhouse to freshen up. He was greeted by Automata along the way as he went inside and find Ophis along with Great Red taking a bath together.
"Yo Aniki! Did ya finish another weapon of yours?"(Great Red)
"Ise come bath with us."(ophis)
He obliged submerging her body in the warm water. Issei felt his tense muscle relaxing and before he dose off, Ophis sat on his lap without hesitation. He didn't bother complaining as she always did it.
"How was the dimensional gap? Did you find those that killed you, red?"
"Nah the only thing I found is the dimensional Gap is constantly influx then was stabilize. It's likely after you sat on the old man's throne it cause a resonances. Perhaps he planned this all along?"(Great Red)
"That's explains it but why can't he do it in the previous timeline?"(Issei)
He ponders in what reason the old man decided to take action in the current timeline. Issei thought about the outer gods but if he was busy fighting them then how did they arrive in their world.
'One question answer two more come. There are too many questions left answered like the plot isn't progressing!'
Issei unconsciously curses the author who is trying his best to make the story interesting. Great Red approached Issei then sat beside her resting on her shoulder while Ophis did he same and took his other shoulders. He put his problem aside and focus at the task in front of him.
After relaxing in his bathhouse, Issei inform Rias and the others about his plan meeting up with Ajuka. He asked about her going with him but decline for now and suggested going with Aika and the rest of the newbies.
"I think it's best you bring them with you since it's unfair that they hadn't join us fight Kokabiel."(Rias)
"What Rias suggested is mine as well."(Sona)
"Are you sure it's not because sera might be there?"
"N-No of course not!"(Sona)
"Hahaha your so cute! Oh right here's your sacred gear and newly improved."
Issei summoned the sacred gears distributing each of them. It was noticeable once they touch them resonating with their soul. Aika and Katase received back their sacred gear with the perverted girl a crystal ball amplify her curse and dark magic while Katase's blade turns pitch black. Both connected with their soul.
"So you going to bring us in hell? Well this ought to be interesting."(Katase)
"So another woman came to you? Let me helped Rias-sama judge this woman!"(Murayama)
"Hey Kaori Stop! Jeez her yandere tendency is really bothersome!" (Katase)
"Eek! Stopped attacking me!"(Jeanne)
"Issei help!"(Le fay)
He only sighs as the two women hid behind him as Murayama does look scary when she gets all Yandere. Issei patted her homing a tamed monster while the other sweat a bit. She was the most troublesome among his harem and only Issei could tame her.
Issei along with lovers doesn't go much to school since they can leave clones to do the work for them. They had already been in High school anyway why not skip. After calming Murayama down they took the time to relax playing a few video games and activities.
_______________________________
The next day Issei was in the floating island city of Agreas which was a beautiful territory in the underworld. It was became his Based in the previous timeline in fighting enemy for the longest time after it's collapse.
He stood silently seeing the vision of countless corpses while holding the severed head of Aika.
"Issei are you still there?"
Issei woke up from his daze looking at his woman who was dress in beautiful clothing. Jeanne still wore her armor as well as Le day while Aika, Murayama, and Katase had changed their outfit.
"Nothing I was just thinking of something."
"Hopefully it's perverted."(Aika)
She smirks while Issei did the same wrapping her waist as they went towards Ajuka. He had already sent an escort for them as teleporting them directly would cause people to panic when they randomly saw them. Issei had place a temporary demonic aura around his lover to ensure no one question them placed
He doesn't want trouble when they sense they were human. Though, it didn't meant he won't fight them if they had bright ideas. They rode carriage towards Ajuka places letting them sight see the busy stress of Agreas. Issei felt nostalgic seeing the common devil overlapping with other races.
'It was truly peaceful….until they arrive.'
Issei clenches his fist trying to calmed himself down but then he felt something resonating with him. He recalled place in realm of the dead and took a note to visit it soon.