The Knight of Ruin(DxD)

Knowing that the 'Vampire Noble' who had been turned into Blood Drinker was his relative his thoughts on the matter changed greatly. By being in touch with her soul he could feel her agony. She had only sought vengeance on her Father for raping her mother and the punishment was being tortured for centuries on end without being able even to go insane. 

'That is dark. Even for me.' 

He placed the sword onto his bed as the day was still early. He had plenty of time until tomorrow when he would have to present himself for Sword training with Souji and then his date with Latia. 

"After I get my Evil Pieces, I should get Akeno for my Bishop as she does not use the traits of the Knight of Rook well. Someone better for that would be someone like Tiamat, the strongest Dragon King. Too bad I am not crazy enough to challenge her yet." 

'Asia is an ok option, but she can't fight at all better to have her as a lovable healer rather than a fighter.' 

He kept thinking of options as he had one picked out for his Knight already. Tobio Ikuse because of his Longinous Canis Lyacon. 

'Issei at the start of the canon is 17 and Tobio is 22. And Tobio was 17 years old in the Prequel Novel Slash Dog so 5 years before canon. Which to me is in 7 years, so I have 2 years to find him and convince him to join my Peerage.'

Once he got his pieces he would search for Tobio as Azazel met him already. Depending if he played his cards right he could befriend Vali and Azazel who were important characters in the Novel. 

"So complicated, but so simple." 

Regardless, he pulled his phone out and called up his teacher MacGregor again. The British mage picked up quickly as he always had his phone near him. 

"Romonus, Surtr told me you unlocked your Touki. Quite an impressive feat, I learned this from Souji, but try to extend it into your blades which will allow you to cut through defenses easier." 

"I will train in the method, the reason I was calling was because I had questions on the Spirit Realm. You said we could make permanent contracts with the Spirits and I was wondering why no one had ever contracted The Harvestor." 

"It has to do with power and pride. The stronger beings of the Spirit Realm are prideful and mighty so they don't like to form contracts with us. The Harvester in particular can be summoned easily, but it is up to his whim to accept or not. 

If you are thinking of forming a contract with him to keep him by you at all times good luck. If you succeed, I will teach you how everything I know about the Spirit Realm. Until then, start reading the grimoire if you have time."

MacGregor hung up so Romonus sat down on his bed and pulled out the Grimoire on souls. He placed a hand on the cover before flipping it over to the first page. He first ready the first thing MacGregor had written. 

'The Soul is the most important, vulnerable, and strongest thing we all share. From the weakest of bugs to the mighties of dragons and gods. By itself, the soul is just energy like Mana, Demonic Power, Ki, Prana, or any number of energies. 

But once one can tap into their Soul Scape, one can begin to use and grow their soul. Anchoring the soul to its mortal shell.' 

Instantly, Romonus became entranced as his soul was stronger than others. That was because according to MacGregor, the soul of an individual grew as they lived. It was a small growth, but he had lived 17 years as a human before this life.

When he was reborn, his soul had been touched by Rahvdall the God of Insanity. During his gestation, his soul had changed to match his new species. The touch of Demonic Energy an offshoot of Mana and all his training had sped the growth of his soul to a level it should not have at this point yet. 

Even someone like Sirzechs had yet to touch upon their souls as usual only Evil Dragons, Liches, Dark Mages, or Divines had access to the soul. Ajuka was a maybe, which was why finding a mage like MacGregor who was paving this path was such a blessing. 

He had several ideas and inspirations like Mahito Idle Transfiguration, Dark Souls Magic, and Lucius Zogratis Soul Magic. He reached out and placed Blood Drinker onto his lap as he read the grimoire. 

Maybe, if he understood the soul better he might be able to help Vespera or speed up the reincarnation of killed Dragons. He also had to ensure that Valerie Tepes did not fall into the hands of Rizevim Lucifer. 

With her, he could remove his weakness to Holy Magic, Silver, Holy Water, and Holy Swords. With her, he could resurrect long-dead Monsters, Heroes, or Villains for his service. Regardless, he got rid of all his thoughts and dived into reading the grimoire. 

Despite MacGregor making it as simple as possible, reading this was both reading and esoteric because of the different magic circles he was looking at. As the more he read the more he felt information enter his mind as he learned things he hadn't thought about before. 

But after reading only a couple pages in 3 hours he suddenly felt a splitting headache. He closed the grimoire and rubbed his forehead. 

'Damn.' 

From what he understood of the grimoire, reading it was using Soul Energy to comprehend and he had he was out. Just like Mana or Demonic Energy, it would recover after resting. That was exactly what he did as still holding Blood Drinker he fell asleep. He still had more training to do, but that could wait until later. 

He was far too exhausted from running out of Soul Energy to do anything, so he slept. While he did so, his Demonic Energy which was flowing through his entire body began to be converted into Soul Energy by his soul slowly. 

Sleeping was the best method to recover from a long day of training both spiritual and physical. Plus, now having unlocked his Touki, his recovery was faster than usual. Another trump card in his arsenal for the future for sure. 

---

He ended up waking up 4 hours later and when he did so he rubbed his head. He grabbed his sword and got up from the bed. 

"Damn, reading this grimoire is going to suck." 

With a quick circulation of his Demonic Energy, he woke himself up and also cleaned himself off. He would shower later as now it was time to get back to his training which never ended up for him.

Without a Sacred Gear, he could only rely on himself which was fine by him. All his power was because of him not because of God. He took a deep breath as he opened a teleport circle under his feet. Because he was a Noble, he knew of ways onto the Earth without needing to take the transport trains.

With a flash, he vanished from his room and appeared on Earth more specifically Antarctica where no humans lived aside from researchers. It was one of his favorite places to train as he could go all out without being bothered.

The only things that lived here were penguins, seals, whales, and birds. Though, from the look of it he was alone at his usual spot.

Once he was here he sat down and began to think about one magic that was used by every faction. Barriers, Isolated Fields, or Bounded Fields keep the Supernatural hidden from the non-magical. 

'Bounded Fields are under-utilized, if I can use a Bounded Field to form a Domain Expansion I could in theory use Malevolent Shrine or my original Domain. One that completely defines me. Might as well give it a shot.' 

He got up to his feet and waved his hand to open a Bounded Field. Thanks to the teaching he had undergone as both a Noble and MacGregor's apprentice his use of Field was excellent. He separated a space of 2.5 miles in his Bounded Field creating a separate space. 

'Ok, here we go.' 

From his back, his large Demon Wings with their glowing runic tattoos emerged. He tensed them and blasted off into the sky where he positioned himself in the middle of his Field. 

He took a deep breath as he raised his hands and formed a hand sign that called to him. One Sukuna would recognized, but if he could steal other's bodies, he could steal his sign. With his Field as the core, he filled it with his techniques AKA Power of Destruction and Gravity as the attack. 

This was a place where he was king, getting a foe in a Bounded Field normally just meant they could fight until one won. But if he got this right, his 'Bounded Field' would evolve into a Domain Expansion. 

Drawing on all the knowledge he had gained, his years of mentoring and training. He remembered his boss, the presence Rahvdall had. When he opened his eyes they began to glow a deep purple. 

'Within this canvas, imbue your techniques into this barrier. Dye it in your colors and create an expression of yourself. This is me. Romonus B. Gremory, heir of the Gremory Clan. Destruction made manifest.' 

"Domain Expansion: Catastrophic Singularity." 

His massive Bounded Field was instantly warped by the expression of his technique. From a simple barrier to keep something trapped, it became the end of the ones trapped. The barrier tore apart as thousands of streams of Demonic Energy and threads of Power of Destruction began to weave together. 

The Runic Tattoos engraved onto his Wings glowed deeper as they became amplifiers for his technique. Potent Gravitational Fields began to force it all together causing his Energy reserves to drain rapidly.

It was not an issue though thanks to his Gremory Clan trait his reserves were innately higher than other Devils. Unlike Sukuna who created a shrine, he created the embodiment of all destruction. 

Much like his movie The End, his Domain Expansion turned the entirety of his Bounded Field into a giant Black Hole of Energy of Destruction, just bigger. Instantly, the embodiment of pure destruction enveloped his Domain which both shocked and overjoyed him.

However, in his honest opinion using his Domain like this was tricky because he turned a massive area into a giant Power of Destruction Black Hole. With his Energy dangerously low, his Domain burst apart and with it the contract. Once it was gone, he took a deep breath as forming that Domain took a lot of his energy. 

"Ok, that one needs more work." 

He flapped his wings and landed on the ground before retracting them. The End was a powerful move he could use more than once, but his Domain made a giant one by converting a Bounded Field into the core of one. 

However, fueling a giant one was hard as his energy began to drain rapidly just maintaining it. 

'I better practice to get it down like Gojo and Sukuna. As long as I can use infinitely close to no energy I will never run out. Though this move wouldn't even be a big deal in Warhammer 40k.'

It was a good thing that even if he did get sent to Warhammer 40k or Fantasy for any reason Rahvdall would protect him. The God of Insanity would not risk losing a talent like Romonus to a mere Chaos God as those were not even gods. 

They were just entities formed of human emotion so they did not deserve to be called gods. Just alien entities from another dimension. As for Romonus, he felt a lot better about finding a better use of Bounded Fields. 

Though if he could think of it, couldn't someone else do the same? This needed further consideration. Regardless he sat down and from his Spatial Ring he pulled out a pure Mana Stone. His Master gave him several for his use if he ever needed to recover his energy faster. 

He drained and converted the Mana inside into Demonic Energy to recover his reserves. Once he had recovered his energy, he continued the rest of his training mainly training in using Blood Drinker which was immune to the Power of Destruction because of Vespera. 

Considering it was used by the Bael Clan during the Great War that made sense. 

'Was that the reason they turned her into this thing or was it truly just a sick punishment? Only Zekram Bael will know so why did he give it to me?' 

He reached out to her through their contract which allowed him to communicate with her without having to enter the blade. 

'How do you feel?' 

'How do you think? Thanks for the blood, I will need more.' 

'I know. I did promise to get you out eventually.' 

'I have waited centuries, waiting a decade or two will just be part of my hell.' 

He raised Blood Drinker and channeled his recovered Demonic Energy into the blade. Instally it was covered in the Power of Destruction.

"Time to get this down." 

He began to spar against what he felt his Sword Master Souji would do.