(Your POV)
Upon activating the spell, the entire area's dim sky becomes a deep blue like deep under the sea. The light of the moon and stars shone as if we were several kilometers deep under the water, and I could feel an immense weight fall onto my body. The weight was enough to cause cracks around my feet and I could feel some of my bones break, but my blessing healed my limbs on the spot. In the newfound darkness around us, luminescent fish spirits could be seen floating around this area. All of the fish were of deep sea origin, but they were phantoms, so they all shone a calming color, ranging from the brightest reds to the coolest purples. Above us a dark shadow in the shape of a serpent overlooked up, the size of the serpent was without equal and it's giant glowing eyes stared down onto us. Kokabiel was gently pulled to the ground as my thrown arm reattached itself, covering itself in jade scales in the process. Multiple spheres of water appeared around me too, but I had no idea why they were there.

"Wait, I thought this spell puts pressure on everyone within range?" Rias mentioned out loud before he noticed that all my bones were cracking and repairing themselves at high speeds. "You didn't...?"

"Yeah, I managed to condense all of the pressure from you guys onto myself." I had trouble speaking due to my jaw bones breaking and repairing themselves.

"But that means you're taking at least 51,450 PSI?" Akeno stared at me in disbelief, which isn't surprising, 51,450 pounds in quite a bit.

"It's fine." The last parts of my body finally stopped regenerating, replacing all of my skin with jade scales. "Lord Issei, I'm awaiting your command."

"Huh?"

"You're my King, aren't you?" I turned my head towards him as I put my cloak on properly, put Genbu on my back, and pulled out my akimbo grimms. "Your job is to command your pieces to be the most effective they can be. You're my friend, so I believe in you."

"Right!" Issei began thinking of a plan as Kokabiel began panicking about the sudden change in the environment, then Issei dawned his sacred gear's armor. "(Y/N), let's kick some ass."

"As you wish, my lord." I responded before pulling up the hood of my cloak and turning into my seal form.

Normally, this would be a horrible idea, but with Create the Depths active, I can swim through the air like flying. When I turned into my seal form I was able to keep up with Kiba, who dashed towards Valper while Asia healed Irina. I swam behind Kokabiel at high speeds before turning back to my human form to use my akimbo grimms. I shot a couple rounds at Kokabiel's wings to prevent him from using them as a shield, causing the fallen angel to swing his light swordshind him and cut me in half around the torso. While Kokabiel smiles at his triumph, I used my legs to knee him in the nose before putting myself together. Since my cloak was technically a second pair of skin, it repaired itself as well. I spun myself around to let Genbu block the next sword swing before Issei delivered a punch to Kokabiel's face.

I ducked underneath Kokabiel's flying body, which was sent through a wall by the sheer force of Issei's punch. I stood back up and fired multiple rounds at Kokabiel, but then I realized he was charging up a massive light spear, so I jumped in front of Issei with my back turned towards Kokabiel, using the shield to block the hit. Multiple light spears bounced off the shield before I jumped into the air, aiming my akimbo grimms at Kokabiel whilst upside down before firing them in rapid succession. Kokabiel's wings seemed to repel the bullets, which is a shame because I like using guns. I put my guns in my backpack before grabbing Genbu with my arms.

Issei soared above Kokabiel using a strong jump before slamming the fallen angel into the ground. Issei managed to hold Kokabiel in place whilst I reeled my shielded fist back before punching Kokabiel in the stomach. Issei Immediately let go of the fallen before I sent the anchor soaring into the air. I quickly pulled my anchor away as Akeno shot multiple bolts of lightning towards Kokabiel in rapid succession as I threw my anchor back at Kokabiel, catching him on my hook before quickly pulling him down towards the ground.

"I summon Cerberus..." Kokabiel was still kicking, and I heard him thinking that just before Cerberus suddenly appeared on the battlefield.

"Koneko, Xenovia, Akeno I need you three to fight Cerberus!" Rias was still changing up a large ball of red magic power. "(Y/N), Issei, and I will keep dealing with Kokabiel!"

"(Y/N), does this spell of yours only crush you or does it have other uses?!" Issei asked as he dodged a swing from Kokabiel's light sword.

"I can summon and command fish, like this." I held my hand towards Kokabiel. "Megalodon."

Upon my activation command, the jaw of a glowing blue, ethereal megalodon appeared below Kokabiel and swallowed him whole as it swam out of the ground like a ghost, revealing it's massive body. Unfortunately the megalodon was quickly cut in half to reveal a soaking wet Kokabiel. I ran towards the fallen angel and slammed my shielded fist against Kokabiel's chin before I grabbed one of my akimbo grimms from my bag and began firing at his neck. The bullets didn't pierce his skin, but it did leave a hefty bruise. In response to this, Kokabiel cut my arm clean off, forcing me to jump back and block an onslaught of light spears.

As for my cut arm, I emptied the magazine into Kokabiel's foot, causing the foot to start bleeding. The fallen angel kicked my arm into a nearby window of the school building. My arm still applied to the laws of physics, only time when it didn't was when my arm was gone for too long and came back to me like I was a magnet, so my options were to let go of the gun or wait for my arm to come back to me naturally. As for why I can't do both, my arm's only flexibility at the moment is in the fingers, and I can't use my fingers if they're holding something. I decided to wait because I didn't want to lose my gun. Issei managed to kick Kokabiel towards me, allowing me to bash his wings with my shield, breaking them in the process. While Kokabiel was reeling from the pain, a red orb appeared in Issei's hand, and I prepared a spell with my own spell, one that I actually memorized.

"Dragon Shot!" Issei shouted, releasing a dark red beam of light towards the fallen angel we were fighting.

"Great Serpent's Breath!" I followed my words with a spiral of frost coming forth from my mouth like a dragon's breath attack, except instead of flames, it was frost and chunks of ice.

Between the ice and laser, Kokabiel couldn't really do much. My breath attack managed to freeze Kokabiel's wings to the point where they were perfectly white and unable to move, while Issei's dragon shot burned Kokabiel's chest. Enough time passed, signaling my missing arm coming back to me at high speeds, now unable to be cut off. I reloaded my gun before aiming at Kokabiel's wings, then I fired at Kokabiel's wings. One by one, his wings shattered apart like glass plates. Understandably horrified by this, Kokabiel left himself open for Issei's punch. The force of which sent Kokabiel towards me, allowing me to kick him into the sky.

I turned into my seal form after putting my gun in my backpack, which stayed on me in my seal form. I picked up my shield with my jaw and swam upwards towards the now wingless angel. I swam above him before commanding the various ethereal fish to attack. The fish with large teeth did what they could by biting into his limbs and tried pulling him apart while some jellyfish stung his torso. I turned back into my human form and raised my anchor above me before diving towards Kokabiel. I struck him in the stomach using my anchor and kicked him, sending Kokabiel down to the ground in agony.

I jumped off Kokabiel, and thought he was done, but I heard his thoughts. A giant light spear was suddenly launched towards Rias in the dust cloud that I created, forcing me to dash in front of Rias and block the light spear before it could reach her. Due to the force that it was thrown, I was sent skidding back a couple of inches, but I stood firm. More light spears were sent towards me, and I blocked every single one of them, but they managed to send me skidding back for every spear that I blocked. I looked from my stance to see Kokabiel was barely injured, despite the massive beating we gave him. Out of desperation, I dropped my shield and rushed towards Kokabiel.

Kokabiel created a sword of light to try and cut me, but his sword can't cut me anymore because the pressure I'm withstanding did more damage than the blade could do. Kokabiel was understandably confused about this sudden predicament as I ran towards him. Once I was close enough, I jumped over him to grab both his arms from behind. My plan was to hold him and his arms in place, allowing Rias to fire her destructive power at Kokabiel. Issei also gave all of his boosted power to Rias, and I could suddenly see that Rias appeared to get a fever in an instant. Her face was red, she was sweating, shivering, appeared tired, and annoyed.

We were betting everything on this one strike. Rias didn't have to worry about killing me, in fact, her using this spell will result in me becoming stronger, but she was hesitant to use her spell. I nodded for her to do it, and reluctantly, Rias sent a massive orb of destruction towards me and Kokabiel. Kokabiel actually seemed scared, and I knew this spell would be effective against this fallen angel. When the spell made contact, a red explosion engulfed the two of us, and I let go of Kokabiel to walk out of the explosion. I jumped back with some of my limbs only hanging my the tendons, but they repaired themselves slowly, allowing me to watch the various layers of muscles rejoin themselves.

I went back to Rias' side, who was now on her knees while a very concerned Issei began panicking like it was his fault. I could tell this was an accident, but I still ran towards Rias, grabbing my dropped shield along the way, and got on my knees to see if I could help her. When I got close enough, Rias' heavy breathing could be heard as she leaned her head against my chest. I defensively wrapped my spare arm around her while I kept the shield in front of us.

"What did I do?!" Issei panicked before apologizing profusely. "I'm so sorry Rias, I'll try to see it up to you! I didn't mean to do this (Y/N)! I know that she likes you and I won't do that to someone who likes my bro!"

"Issei!"

"I'm going to pretend I didn't hear that last part."

"Relax, it's just the sudden change in power." Akeno reassured as she walked towards us calmly, and I looked behind her to see that Cerberus was unconscious. "A side effect of transferring an immense amount of power is a fever, kind of like getting a vaccine for the first time. The power is new to her body and therefore causes a fever because Rias' body is not used to the sudden amount of power. The more power you transfer, the worse the fever is."

(A/N: In case it wasn't obvious, biology or anything medical is not my best subject but I know more then your average Karen.)

"So it'll come to pass?" I asked, and Akeno nodded, while I reached into my backpack and pulled out a water bottle before handing it to Rias. "Rias, you need to stay hydrated."

"Let me stay like this." Rias begged, and I huffed in slight annoyance but understanding as something in the sky caught our attention.

Soaring down towards the ground was someone wearing armor that looked similar to Issei's, but it was entirely white and blue instead of Issei's red and green. Plus this guy's wings were very pretty in my opinion. He looked ready for a fight but Kokabiel was dead. The moment he entered my domain, he was pulled to the ground slowly, kind of like he was falling on the moon. However, I noticed that not only did his fall go by slower and slower, but my fish also seemed to be getting smaller. This continued until my fish were gone, the white armored guy was flying again, and my entire spell was deactivated, despite it supposedly lasting thirty minutes.

"So you're his red dragon emperor?" The white armored man looked towards Xenovia and Irina as he walked towards Issei. "Just so you all know, Kokabiel was right, god is dead."

"No..." Xenovia looked distraught, as did Irina, not that I blame them, everything they did was for nothing, the church, all of it, for nothing.

"I mean, that much was kind of obvious." I actually used to pray some time after my mother left when I was younger, but it didn't help me in the slightest and doing things myself was much more effective then praying to god.

"Good, now with that out of the way, I'm disappointed in you, Red Dragon Emperor." The person insulted my friend as he walked towards him, causing me to stand up whilst holding Rias in one arm and my anchor in the other. "Hm?"

"Stay away from my friend." I demanded as I used my anchor to act as a barrier between Issei and this man.

"Who do you think you are?" This guy appeared to have a superiority complex, even as he looked at my seal cloak and scales. "A selkie? That's a rare sight."

"I'm (Y/N) (L/N), the Ultimate Immortal." I introduced myself calmly, but still unwavering about my stance about Issei. "I do not wish to fight you, as you have displayed your prowess in combat by nullifying my spell."

"That was your spell, Impressive, you may be worth my attention after all." The armored man turned his attention back to Issei. "Still, like I was saying, Red Dragon, you're quite the disappointment."

"Yeah...you're gonna need to elaborate more on that." Issei deactivated his armor to look the guy in the eyes. "Like Rias is disappointed in me because I fight for titties, Irina's disappointed that I became a massive pervert, and I think the only person here who isn't disappointed in me is (Y/N)."

"That's exactly why I'm disappointed in you, Red Dragon." The man let out an annoyed huff. "You're a perverted man who doesn't deserve to wield the power Ddraig has to offer, you're just a helpless pervert who won't use this power for anything other than harassing girls. Before you became a devil, all you did was peak at girls, and the only reason you're not dead is because of your security guard over there."

"Never before have I been so offended by something I 100% agree with." Issei appeared to be reciting a meme he saw on the internet, but I wouldn't know, memes are still new to me.

"If you ask me, this (Y/N) fellow is far more worthy of Ddraig then you are." The man pointed his armored finger at me, who was still holding Rias. "He's noble, knows how to fight, and is incredibly humble."

"Nah." I disagreed with the man's statement. "Issei's the only person who can use his sacred gear BECAUSE he's a pervert, his unorthodox way of thinking gives him new options to explore. I can't think like that because I only think of winning, but Issei's goal to remove clothes, and what's the point of the most powerful armor in the world if it gets destroyed? Besides, Issei is a good guy when you look behind his pervertedness."

"I never would have imagined someone like you defending someone like the Red Dragon." The man let out a low chuckle before soaring into the air once more. "I am your rival, the White Dragon, so I demand that you get stronger."

With that said the man left us by flying into the clouds. It was awkwardly silent until Rias told me she's able to stand on her own two feet again, so I set her down and noticed she had trouble with her balance, so I held her hand to prevent her from falling. Akeno looked slightly jealous about this, but still kept her smile on her face, and I can't really read Koneko's expression. Irina, Xenovia, and Asia still looked mildly depressed about everything they lived for was for nothing. It was quiet until Issei spoke up again.

"What a prick."

"At least he wasn't as bad as Riser."

"Yeah I suppose that's true."

(A/N: When I read your guy's opinions in the last chapter, I was kind of surprised no one suggested Asia or Koneko. Am I judging you guys? Not at all, I asked you guys for your opinion and I gotta thank y'all for giving me it. I kind of did some thinking, so here's an oversimplified list of ships. Possibly not all of them, but it's just an oversimplified list I thought some of you could get a kick out of.  
This book: Best boi x yes
Rias x (Y/N): Noble who fell in love with knight+selfless knight who won't hesitate to die for the noble.
Akeno x (Y/N): Opposites that influence themselves to be better
Koneko x (Y/N) Couple that usually expresses their love through actions
Asia x (Y/N): "I'm scared" + "I'm not"
Xenovia x (Y/N): lovable idiots who don't know how to express themselves properly.
Kuroka x (Y/N): "If anything happens to them I will kill everyone in this room and then myself" as a couple.
Ravel x (Y/N): Confident girl with superiority complex + top
Rossweisse x (Y/N): Most likely to be found on the couch cuddling
Irina x (Y/N): Walking disasters who can't operate without each other
Le Fay x (Y/N): Doing her best and doing it really well + security guard
Yasaka x (Y/N): mom friend x top tier dad material
Ingvild x (Y/N): A couple that can be found constantly complimenting eachother.
Serafall x (Y/N): Passionate girl x clueless giant who likes listening
Elmenhilde x (Y/N):