The Knight of Ruin(DxD)

(Quick question, looking for ideas, but the power rankings I normally use are Low, Mid, High, Ultimate, Satan, Heavenly Dragon, Dragon God, and ExE. But, what is a better name for the Satan rank?)

When Romonus woke up, he pulled out his phone which was produced by Ajuka. They were better than the most modern iPhones and could be charged with just a bit of Demonic Energy.

When he checked the time he smiled as it was 6:30 AM. He still had 30 minutes before he had to present himself for training. If he was lucky he would be able to see his brother and if he was not too busy he could ask him for some pointers. 

"But then again, arriving on time is late."

He waved his hand causing his suit to fall into place on his body. When he was dressed he pulled his boots into his hands, but before putting them on he shined and cleaned them with a simple spell. He put them on and got up to leave his room.

As usual, he locked his room before he created a teleport circle under his feet. In a burst of light, he appeared in front of Rias' room as her room was quite far from his. Plus, rather than walk it was better to just teleport.

Once he appeared in front of her room he opened the door and rushed in.

"RIAS! WAKE UP! WAKE UP! UP AND AT EM!"

Rias who had been having a pleasant dream was awoken suddenly causing her to jump. With groggy eyes, she fell out of bed onto her face.

"Ow."

He couldn't help but laugh at her as she had not been woken up like that before. When Rias realized who it was she rubbed her eyes as she tried to wake up.

"Brother? What are you doing?"

He walked toward her and grabbed her hand to pull her to her feet. She was barely awake and her bed hair looked hilarious. Even her nightgown was all frizzy and cute making him shake his head. She was still 11 after all. 

He patted her cute head causing her hair to straighten out.

"Training starts in half an hour. Of course, you can just refuse, but you know the consequences. Big bad Riser will eat you. And by eat I mean force you onto his bed."

Romonus stuck his tongue out and raised his hands over his head to freak her out. Her face instantly pulled back into fear as she shoved him back.

"NO! I won't quit. I will train. Don't let him take me."

She looked quite spooked so he smiled and reassured her.

"I won't let him take you Rias, but if Sirzechs and I do everything for you what will you do in 500 years? You got to take charge of your own life at some point. Right?" 

She thought about it before she nodded with a determined look on her face.

"You right brother. When do we start?" 

"Soon."

He raised his hand and formed a magic circle above her head which turned her nightgown into some proper workout clothes. Once she was dressed he stood next to her and grabbed her hand. 

(Image here)

"Get ready. Just promise me you won't quit." 

"I won't." 

Rias barely remembered the last time she had tried to train along Romonus. She was about 7 if her memory served her correctly. He had dragged her along with him and Souji, Surtr, and MacGregor all pushed her hard which caused her to quit in an hour. 

At the time, being treated so harshly after living in luxury for her whole life was scary. Despite knowing they only had her best wishes in mind, her brother's Knight, Rook, and Bishop could all be scary people. 

And Romonus had been training with them since he was 5 years old. Now, she would take charge of herself and not run anymore. Romonus opened a teleport circle under their feet and teleported them to the Devil Capital of Lilith. 

Their brother Sirzechs ruled over the city alongside his three goofball friends. More specifically he teleported in front of his brother's castle where he conducted his official Satan duties. 

Rias instantly began to look around in wonder as it had been 4 years since she came with him. 

"Were back?" 

Instantly both Rias and Romonus were enveloped in pillar-like arms. 

"HAHAHAHA, THE KIDS ARE BACK!"

Romonus instantly knew who it was so he turned his neck to look at one of his teachers. 

"Second sir, good to see you." 

Surtr Second was without question the strongest Rook of the Underworld. He was called the Ultimate Rook and his name Second was because the Norse gods tried to clone the original making him the second. But when they couldn't control him and he went berserk, they abandoned him as he was too difficult to kill or lock up. 

Until Sirzechs found him and helped him bring his power under control. Once he calmed down, he accepted Sirzechs' offer to join his peerage, and under a Mutation Rook piece, he was turned into a Devil. 

"Romonus and Rias as well? TODAY IS A GRAND DAY!" 

He hugged them even tighter which made Rias gasp for air. She began to pat his arms to not be crushed, but Romonus tried to force his way out of the hug.

"Second, you're going to kill them." 

"Ah, my bad." 

Second, let go of them which made Rias gasp for air. Romonus took a few deep breaths to steady his breathing as Second was a Fire Giant with a Mutation Rook piece making him monstrously strong.

Once he got his breath he turned to his sword teacher Souji Okita, the best Knight of the Underworld. In life, he had been the Shisengumi Captain. Despite being a Knight, he was skilled at magic rituals which he had tried to use to cure his tuberculosis which was fatal at the time. 

In a last-ditch effort to survive he summoned a Devil which just so happened to be Sirzechs who saved him by turning him into a Devil. It took both his brother's Knight Pieces, but it was worth it in the end. 

However, from the look of it, MacGregor wasn't here. Romonus gave a polite bow as these two men deserved the greatest respect. 

"Hello again master. Will Mathers not be here today?" 

Souji shook his head as he sat on a rock.

"No. He said he will be busy with his studies so he told us to spend more time training you. I heard your uncle gifted you a Demon Sword. I wonder how he knew you could wield Demon Swords?"

Romonus did wonder about that. 

"Maybe he tested my talent beforehand or he just assumed I would." 

Souji pondered on it before he shook his head. 

"Regardless, you can wield them. On another note, I see you got stronger again. Expect your training to match it." 

Romonus was now feeling excited to learn higher stuff. 

"I wouldn't have it any other way. Where do I begin?" 

Surtr and Souji looked at each other before the Knight pulled out a coin from his pocket. He flipped the coin and called the side he wanted. 

"Heads." 

Second, crossed his arms with a grin.

"Tails." 

When the coin fell into his hand he flipped it onto the back of his hand. When they both looked at the coin Second began to laugh as it landed on tails. Souji groaned as he tossed the coin to Surtr. 

"Alright then, guess I will be helping Rias. Don't worry, I won't make you swing a sword. Instead, I will have you use your Power of Destruction in more refined ways along with being able to use it on the move. Ready?"

Rias nodded with a determined look on her face. 

"Yes sir." 

As for Surtr, he turned to Romonus before he tossed off his trench coat revealing his muscular body. He was over 2 meters tall with copper-toned skin and a body fitting of a Jötunn. He jumped back the distance of a football field and raised his arms with open palms. 

"LET'S GO!"

Romonus smiled as with a wave of his hand the upper part of his outfit fell off. He stored it in his ring to not leave it on the ground. Thanks to Surtr's training regiment, despite his age, he had cultivated an exceptional physique. 

It couldn't compare to his teacher, but it was a work in progress. Thanks to these brawls and the insane training he underwent under the Jötunn, he was close. He could feel it was just a matter of time before he tapped into his Touki or Aura. 

He raised his hands into fists and got ready for the beating he was sure to receive. Both he and Surtr did not move until the bell sounded off which was Rias attacking Souji with a blast of Destruction. Instantly, Surtr charged toward Romonus who turned into a blur as he charged against his master.

He pulled his arm back and smashed his fist against Surtr's liver, but he didn't even dent the muscle. 

"HAHAHAHAHAHAH! MORE POWER!"

Surtr spread his arms wide as Romonus began to throw a flurry of punches against the Fire Giant without effect. 

'DAMN IT! IT'S ITADORI VS MAHITO!' 

Each time he landed a punch it did not sound like he was hitting flesh. It was like he was hitting pure metal, but Surtr kept his grin before he gazed down at him with burning eyes. Romonus couldn't even react before Surt's giant palm smashed into his face launching him into the distance. 

Surtr charged after him as Romonus flipped mid-air to land on the ground. His feet dug trenches in the ground as he charged toward Surtr. He jumped in the air as he tried to land an uppercut against the giant, but the mad Jötunn used his chin to smash against his fist. 

The power Surtr held caused Romonus to be forced into a crater in the ground. Surtr snarled as he shoved his arm into the ground and pulled Romonus out like a carrot. Romonus was bruised, but he was not out. 

He spun around like a Honey Badger and twisted Surtr's wrist to get loose. He lept off Surtr's arm and landed a massive kick to the head of Surtr, but he just used his head to lock Romonus' leg against his shoulder. 

"NICE!" 

With his free hand, he grabbed Romonus' face and leaped high into the air. Just when they reached a truly staggering height he turned to Romonus who now was feeling very afraid. He kept punching at Surtr's hand as it was covering his whole face. 

"GOOD LUCK!"

He pulled back and tossed Romonus straight down like a meteor. Romonus screamed as he tried to fix his fall, but Surtr put so much force into his throw. 

---

Sirzechs sighed as he did his borring paperwork as a Satan. Grayfia wouldn't let him slack off and he was not even in his fancy chamber, but in this dingy office. Just as he was going to continue, he heard a familiar scream. 

"Huh?" 

He looked out the window and saw Romonus falling to the ground. He got up and looked out the window to see Surtr in the sky and Souji with Rias. His eyes lit up as he was about to join them in training his siblings, but he paused. 

Grayfia was going to be here soon and if she saw he was slacking, she would tie him to his chair until he was done. But, his adorable siblings were right there. He could skip just one day, right? When he imagined his wife and her angry face he smartly sat back down.

'Good luck Romonus.' 

---

As for Romonus, he did not use his wings as this was the training. ONLY hands and no energy. He only had a few moments before he hit the ground which would hurt like hell. He stopped panicking and instead closed his eyes. 

He crossed his arms around his chest and stuck his legs together. He did not use his Demonic Energy or anything of the sort, but just before he hit the ground a white aura began to form around his body. He had finally reached his Life Force more commonly called Touki. 

Surtr began to grin wildly as he saw that. 

'He finally got it.' 

Romonus opened his eyes the instant his feet touched the ground he lept back into the air with a double jump. Surtr snarled as he lept down with his fist pulled back. Around his body, a firey red Touji formed as he too had his unlocked. 

"COME ON! SHOW ME YOUR POWER ROMONUS!" 

"YES SIR!" 

Romonus pulled his fist back and punched against Surtr's giant fist. When two Touki users clashed, the one with the stronger life force would win. And no matter how talented he was, Romonus was not going to defeat Surtr who had been using his for nearly 300 years. 

His own was forced back into his body and he was thrown down to the ground in a crator. It was a miracle he was not unconscious as Surtr lept down. 

"Uhh, you good?" 

Romonus raised a shaky thumb. 

"Peachy." 

He went limp as Surtr helped him up. 

"That was fun wasn't it?" 

Romonus nodded. 

"It was, but painful." 

"HAHAHAHA! Pain just shows how we live. Now, recover. Souji's up next." 

They both looked toward Rias who was forming large orbs of Destruction much like their brother's signature move. Souji dodged and sliced them, but was impressive that she got it down so quickly. 

Romonus smiled as Rias was super talented naturally. She just needed someone or something to motivate her and he was that motivator. 

'She truly is the best.'