(Your POV)
I decided to cause some collateral damage as I kicked down the door with my foot, and after everyone stepped over it, I picked up the door and held it like I was going to throw it. Kiba suddenly vanished into the air, most likely scouting ahead to check the soldiers. While we waited for Kiba to return, I aimed my K22 down the halls to make sure no soldiers were coming towards us. Our top priorities were A: Capturing Marius, 2: Saving Valerie, and 3: Escaping with Valerie and the holy grail intact. We waited for a couple minutes before Kiba came back to us, and he began leading us towards the basement. There weren't many guards inside of the basement, so getting there and then going to Marius was our best bet. In a flash of blue and gold light I made my gun disappear, since using a pistol might not be the best idea. While Kiba was in the front of the group, I was in the back, due to me being able to cover all distances thanks to my firearms. We amazingly didn't encounter any guards, but any we did encounter were easily taken out by me throwing the door. Literally, I just threw the door at them. We followed Kiba down the stairs until he suddenly hid behind a wall, and we hid alongside him. I used my mask's thermal vision to look through the walls. On the other side, I saw a vast number of vampire guards, all dressed in silver and crimson colored armor.  All of them possessed some kind of weapon, namely flails, spears, glaives, and swords. We turned our attention to each other to discuss our next plan of action.

"Now then, who wants to fight these guys?" Azazel pointed his thumb towards the room with everyone in it. "There will be strong enemies further ahead, but these guys don't like pushovers."

"I'd say we save your strength for the front lines should we encounter Crom Cruach, Rizevim, Lilith, or Marius." Akeno suggested.

"I can use Durandal's Destructive Power if they're all lined up together." Xenovia got Durandal ready, but Rias stopped her.

"Don't, that's not the kind of thing you can use consecutively, so don't bother." Rias ordered the knight. 

"We'll do it." Bennia stepped forwards with Loup, the latter of whom was starting to take off his jacket.

"Very well then, we wish you luck." Rias nodded in approval of Loup and Bennia fighting alone.

Bennia and Loup both entered the room, and with very different approaches. Bennia rushed towards the vampires, leaving a trail of darkness as she glided across the floor. From this path of darkness, more clones of Bennia emerged, and matched her in speed. The vampire knights tried stabbing Bennia's clones, only for the clones to be replaced by darkness. Bennia jumped over the group of vampires and slashed with her scythe, but there were no physical wounds on the vampires. Instead, the scythe seemed to phase right through the vampires, and the vampires collapsed. Loup on the other hand began growing in size and muscle mass, as well as hair amount until he was now covered in ash colored fur with sharp fangs in his mouth. Loup's hands were covered in an unfamiliar magic circle as he delivered an uppercut to one of the guards with a flame-covered fist that burned so hot that most of the armor disappeared. Bennia and Loup signaled for us to run past them towards the next lowest floor, and we ran past them while I summoned a M249 machine gun, just in case any of the vampires tried anything while we ran past. I noticed one of the vampires tried cutting Gasper's head off with an axe, but he was swiftly met with 5.56 mm bullets piercing his arm. We ran through a large doorway, which led down a flight of stairs, but before we could even reach the bottom floor, we were suddenly attacked by someone launching a ball of darkness. To counter it, Connla summoned a wall of shadows to launch the hall back at the target. The person who attacked us was a vampire, who wore casual clothes like his allies that were on this floor.

"These are not your ordinary opponents." I switched on Mana Vision, which allows me to see the magic power of my target through the form of an aura enveloping that something. For example, these vampires had a large golden aura around them. "These vampires have been magically enhanced with the holy grail. I can probably fill these guys with magically infused bullets, see how that turns out."

"It's okay, I've got this." Koneko stopped me before I could waste any of my bullets as she walked towards the magically enhanced vampires.

"Alright, but the moment things start going south, I'm pulling you out of there." I trusted Koneko, since she gives everything her all, despite her normally monotone demeanor.

Koneko walked towards the group of guards, and with every step she took, a white aura began enveloping her until her form was no longer visible. The light got slightly taller before dispersing to reveal a woman who looked like Koneko, but looked around Kuroka's age. I heard the sound of sniffling beside me, so I turned my head to see Kuroka was in tears, like she was a proud parent or something.

"Koneko finally did it~" Kuroka was so proud of Koneko that she was crying, so I summoned a tissue for her and handed it to the nekomata. "Thank you (Y/N), you're so sweet."

"No problem, but what's going on with Koneko's body?" I wondered as Kuroka blew her nose before burning the tissue and tossing it onto Bikou.

"By gathering the natural ki around her and synchronizing with it, she allowed herself to grow by force." Kuroka explained. "It's a senjutsu technique which allows Koneko to use her nekomata's abilities to the fullest without fearing that she'll end up in a murder frenzy. Koneko calls this mode..Shirone Mode."

"Oh so she wanted to avoid the mistake you made?"

"Yeah...mistake."

"Kasha."

With a wave of her hand, Koneko summons a wheel made of white flames that appears to hover in the air. Koneko clapped her hands, and more of these kasha wheels appeared all around her. The wheels spun like a dance as they flew towards the vampires. All of the vampires looked confused by this until one of the vampires made the fatal mistake of touching the wheel with his finger. This caused him to disintegrate in a flash of light. This got the attention of all the other vampires, who now recognized the kasha wheels as a threat and tried dodging the wheels by jumping to avoid the wheel, only for the wheels to change direction to hit the vampires dead on. The vampires turned to ash while a single vampire remained. The vampire ran towards Koneko and tried punching her in the stomach, only to turn into ash on the spot.

"Right now, I am the power of purification itself." Koneko informed the man as he turned to ash, slowly in front of Koneko. "You should have known that you would disappear simply by touching me."

"Nyaaaah, go Koneko!" Kuroka cheered Koneko on.

All in a couple of seconds, Koneko managed to take down all the vampires in the room all on her own. She looked around the room to see the piles of ashes and clothes that piled on the ground, then she let out a tired breath. Koneko began swaying, and I caught her in my arms before she could collapse from exhaustion.

"Wait...(Y/N)...you might get hurt..." Koneko seemed concerned about me, since I was still a devil, and her purification powers might have hurt me, but it didn't.

"It's okay, I won't get hurt, because it's you." I didn't feel anything burning on me, which was a good sign. "Good job with those vampires Koneko, you've done well."

"Thank you...(Y/N)." Koneko let out a cute yawn. "I can't maintain this form for long, but one day, I will definitely turn out like this and become your bride..."

What.

Koneko was soon covered in a bright white light once more before turning back into her usual petite form, allowing me to carry her with one arm. Koneko was exhausted, so she passed out on the spot. She weighed practically nothing to me, so I carried her in one hand while I held my M249 in the other. Rias ordered that I lay Koneko on top of Fenrir, who was being ridden by Le Fay like Fenrir was a horse. I kicked down the door to the next floor, causing an evil aura to envelop the atmosphere. I scanned around the room, which was so massive you could see an entire pod of blue whales in here and they would still have enough space to swim around. This magic aura was a dark green color, and I knew right away what it was. It was the dragon that got in the way of our rescue of Koneko, Gasper, and Ravel...Grendel.

"So...you lot have come farther than we expected." Grendel laughed as the former Khaos Brigade members looked at Grendel in confusion.

"Who the heck are you?" Heracles asked whilst crossing his arms and tilting his head.

"Nobody important, we can just kill him." I cracked my neck and slammed my palms on the ground in front of us. "Kiba, I need you to make a series of anti magic swords that repels magic while also amplifying it, Rias, can you make a small orb of destruction, and Vali, can you divide Grendel's defensive abilities?"

While everyone got ready, I created a steampunk style magic circle to summon an old creation of mine, the Seal Seal Cannon. Kiba managed to create the swords and wrapped them into a ball. Kiba and I opened up the ball and allowed Rias to toss the orb of destruction into the ball of swords, then we quickly closed it. Inside the ball of swords, I can see what was going on thanks to my mask. The orb of destruction was getting reflected a bunch of times and getting amplified just as much. I put the ball inside the cannon before walking to the side of the cannon. There was a lever there, and I pulled the lever to launch it at Grendel, whose defenses were weakened thanks to Vali using Divine Dividing. The ammunition hit Grendel in the face, causing a powerful black and red explosion to engulf Grendel's head, pretty much deleting it from existence. Now that Grendel's head was gone, the body fell onto the ground with a powerful thud.

"Great, now let's go." I clapped my hands, making the cannon disappear in a poof of ethereal fishes and snow.

"I can't believe you guys just one shot the legendary dragon, Grendel." Georg looked at the corpse of the dragon in disbelief.

"To be fair, he was absolutely no one important." Akeno followed behind me as the door on the opposite side of the room suddenly opened, and from this open door, a man with gold and black colored hair emerged. "Be careful everyone, it's Crom Cruach!"

"I can't have all you guys go past this point, too many people can ruin my employer's plans after all." Crom Cruach buttoned his sleeves.

"H-He's here!" Ddraig shouted in fear, while all of us got into a fighting stance, ready to take this guy on. "Even with (Y/N)'s upgrades, I don't think we'd be able to stand a chance."

"What if I give Cao Cao the True Longinus back?" I asked the dragon, who was silent to indicate that he was thinking about it.

"Then we might be able to stand a chance." Ddraig answered, and without hesitation, I summoned the True Longinus and tossed it to Cao Cao, who was now dual wielding it with Jiuchidingpa.

"I suppose those odds will increase if we were to join him?" Georg stepped up with Leonardo. "Leonardo and I both wield our own Longinus as well."

"Then the odds are getting better." Ddraig was thinking as Cao Cao, Georg, Leonardo, Issei, and I stood together, ready to face the man in front of us.

"What about the rest of us too?" Kiba stepped up, while Asia helped Koneko recover her stamina with some kind of spell.

"If you all fight together, then there's a 1/30 chance of winning." Ddraig announced. "However, Crom Cruach is likely going to target the weak ones before going after you guys."

"Don't worry, I'll protect everyone else, the rest of you just need to focus on defeating Crom Cruach." I aimed my M249 at Crom Cruach.

"Issei, are you confident we can defeat Crom Cruach?" Vali turned his head to look at his rival. "As of right now, he is clearly above you."

"I don't think we'll win, but at the same time, I don't think we'll lose." Issei got his gauntlet at the ready.

"Heh, you're acting more confident than I am." Vali chucked before summoning Divine Dividing.

Issei activated Crimson Queen Promotion, Vali activated his balance breaker, and the two dragons launched themselves towards Crom Cruach. To help my friends, I summoned a flash bang grenade and pulled the pin before launching it towards Crom Cruach. Crom Cruach clearly didn't know what a flash bang grenade was because he not only caught it, but also held it up to his face, not knowing what it was. In an instant, the flash bang blew up in Crom Cruach's face, disorientating him enough to allow Vali to deliver a punch to Crom Cruach's cheek and Issei to deliver a powerful kick to his stomach. Crom Cruach took the two attacks like a champ, not even showing any signs of pain as he knees Issei into the ceiling so hard that Issei bumped into Vali, causing Vali to get knocked into the ceiling as well. Crom Cruach took in a massive breath, most likely trying to attempt a breath attack. But before he could, Bikou extended his staff into Crom Cruach's mouth, causing the dragon to gag. Crom Cruach bit the end of the staff, however, and he used this grip to knock Bikou into the wall with ease. Crom Cruach rushed towards Rias, who was charging up a massive orb of destruction, but before he could land a hit on her, I moved in front of Rias. I summoned Genbu and slammed the bottom of the shield onto the ground. 

"A Line in the Sand, and No Further!" A weird chant to be sure, but this chant summoned two blue ethereal knights on each side of me with massive shields. Crom Cruach punched the shield, expecting it to break, but Genbu stood tall.

"Nice work Sealboi!" Heracles ran to the side of Crom Cruach with Jeane on the other side of him.

Heracles delivered a powerful punch to Crom Cruach's side, while Jeane tried using her rapier to stab his side. Crom Cruach didn't even flinch as he caught both the rapier and fist in his hands, then he turned his hands to force Jeane and Heracles off their feet. Crom Cruach was about to throw Heracles into Jeane, but before he could do that, I put the barrel of my M249 into Crom Cruach's chest, and with lightning magically infused bullets, I fired into Crom Cruach's chest, and despite this confidence, I could tell this was doing something from the sizzling on Crom Cruach's chest. Crom Cruach uppercut my jaw, but I managed to take the punch, dropping my shield and gun and delivering a sucker punch into Crom Cruach's face.

"How can (Y/N) tank a blow from that dragon?" Georg was preparing a series of magic circles aimed at Crom Cruach. "Both the heavenly dragons were knocked into the ceiling because of him."

"What do you think allows (Y/N) to fight alongside the Longinus users in the first place?" Rias asked while I grabbed Crom Cruach's collar and violently pulled his head into my forehead. "His firepower? Creativity? No, all of this is just raw endurance."

While Crom Cruach was staggering, I grabbed the dragon's hair and quickly pulled him into my knee, kneeing his eye before punching Crom Cruach's jaw. Crom Cruach didn't seem all that affected by my punching, so I wrapped my leg behind the dragon's leg and pulled him towards me, knocking him off balance and knocking him onto the ground. I grabbed my M249 and fired several earth magic rounds into his chest, with each round having the power of a mortar. Crom Cruach appeared to react like he was getting stung by a multitude of bees, before he kicked me away from him, sending me skidding back a couple feet. I fired more bullets Crom Cruach's feet while Akeno summoned both her devil and fallen Angel wings to take to the sky. Aken began charging up yellow colored lightning before sending multiple bolts towards Crom Cruach, who dodged them only to be met with a punch in the back of the head by Heracles.

"Variant Detonation!" Heracles shouted in activation of his sacred gear, causing an explosion to engulf Crom Cruach's head while multiple swords emerged from beneath the dragon's feet.

"Blade Blacksmith!" Jeane hid behind Rossweisse, who had a wall of magic circles at the ready. Rossweisse looked at me and nodded, and in response, I dropped the gun and ran towards Crom Cruach. I grabbed the dragon's waist before German suplexing him into a live grenade I placed behind me. An explosion engulfed both of us before Rossweisse sent multiple beams of magic towards us, and I dodged just before they hit us. Crom Cruach took in a breath to let out a fire breath towards Rias, only for that breath of fire to be blocked by a turtle like monster.

"Nice one Leonardo!" Irina and Xenovia dashed towards Crom Cruach with their respective holy swords at the ready, and Crom Cruach tried playing it defensively by putting his arms up, but I put a threw a sticky bomb onto his arms on the side that was facing his face.

The bomb went off, and broke Crom Cruach's defensive stance, allowing Xenovia to use Ex Durandal and Irinato use Solais on the dragon's chest, specifically the place I was aiming at with my gun. Xenovia swung her Ex Durandal, releasing a destructive wave of energy into Crom Cruach's chest while Irina tried piercing his eye, only to get backhanded into the nearest wall, but she was agile enough to land on her feet instead of crashing into the wall.  Despite the fact she was uninjured, Xenovia was pissed that her friend was launched into the wall. Xenovia began slashing wildly, and with ease, Crom Cruanch dodged the swings. Lucky for Cao Cao, she was distracting the dragon from him, allowing Cao Cao to pierce the dragon's stomach with his spear. The blade of the True Longinus emerged on the other side of Crom Cruach's stomach, and Cao Cao tried cutting off the dragon's head with Jiuchidingpa, but the dragon caught the swing with his finger tips.

"You should know that even the strongest evil dragon can't stand up against 5 Longinus fighting together, and the reincarnation of the very person who created the Longinus in the first person." Cao Cao smirked confidently. "(Y/N), now!"

"YEET."

I launched a barrel covered in purple stuff at Crom Cruach, along with a C4 on it. The barrel blew up in Crom Cruach's face, covering the man in a purple liquid. Issei and Vali both finally got out of the ceiling and were preparing their own attacks. Vali had a Norse magic circle in his hands, Issei had a massive crimson cannon ready, so I decided to use my own attack. I dropped my current weapon and summoned a circle of different weapons all around me, all of which were firearms in some form. Vali launched a powerful laser made of lightning from his Norse magic circle, Issei fired a red laser beam at Crom Cruach, and I quickly fired all of my guns at Crom Cruach. I started with emptying the assault rifle magazines with one hand and firing all the rounds in the double barrel towards the evil dragon, and when I ran out of amo, I dropped the weapons to pick up a sub machine gun and a minigun to fire all the bullets, then I dual wielded two rocket launchers, and ended things off by miring multiple Glock rounds into Crom's chest, followed by three grenades. When our attacks hit, there was a thick smoke, but much to my horror, Crom Cruach was unscathed, and even healing from Cao Cao's wound. Crom Cruach summoned his wings and flew from the smoke and grabbed my throat before pinning me into the nearby wall, causing it to crack. Crom Cruach then began punching me.

"Respond to my voice, the Golden Dragon King." Asia began calling Fafnir? Why? I can take anything from Crom Cruach. "Crawl on the ground and receive my reward! Please come out! Golden Dragon, Fafnir!"

"Is it panty time?" The first word Fafnir spoke when he appeared was asking for panties, and in response, all of the former Khaos brigade members glared at him.

"Bitch I'll put you in the ground." Bikou appeared on Fafnir's head and stomped on it. "So help us save Sealboi and defeat Crom Cruach, or I will get Nahele to do whatever he wants to you!"

"Amazing threat there Bikou." A rip in space appeared behind me, and from that space, Arthur grabbed my collar before pulling me into the tear to close it. Another tear appeared, and I was suddenly behind my allies. "Are you alright (Y/N)?"

"How did you do that?" I looked at Arthur, and I noticed how he was only wielding Caliburn. "Where did your Excalibur go?"

"Oh, I returned it to solidify my alliance with the church." Arthur pointed at Fafnir, who was biting Crom Cruach's arm, causing it to bleed. "Fenrir doesn't need to be controlled anymore because he formed a contract with Le Fay."

"Albion, don't listen to Fafnir!" Ddraig's voice could be heard shouting at Albion.

"What is it now? Fafnir's a pervert as well." Albion then began hyperventilating. "WHY AM I THE ONLY NORMAL DRAGON?!"

"I TOLD YOU I AM NOT A PERVERT MY MASTER IS."

"If I don't get treasure, I will not help." Fafnir huffed, and in response, I walked up to the dragon and stabbed it with a knife. "OWIE, WHAT WAS THAT FOR?!"

"I'll just let you guys get this sorted out..." Crom Cruach took out a phone and began scrolling. "Oh hey, Gawr Gura started a new stream."

"Personally I'm a Yuzuki Choco fan." Issei joined in the conversation.

"I may not be an official leader yet, but I still possess the power to arrest you." I informed Fafnir, and I honestly did. "Asia is 17 as of right now, and you're thousands of years old. So asking for her panties can technically count as pedophilia and sexual harassment of minors."

"He has a point, you know." Azazel crossed his arms while glaring at Fafnir. "There was this prison I designed just for dragons that I've been dying to use for ages..."

"It's no pedophilia, it's part of our contract, I'll ask Asia now!" Fafnir turned his attention to Asia. "Asia, am I a pervert?"

"...Since I married (Y/N), I've wanted to have seven children..." Asia's eyes were now spiraling as she laid on the ground. "Fufufu~Geez Papa, you are such a Naught Papa~"

"Is she still with us?" Kuroka poked Asia's cheek, and it was like Asia was escaping from reality. "I think she passed out from being overloaded with emotions."

"I'll protect her with Koneko!" Le Fay picked up Asia and laid her on the ground next to Koneko in a kind of makeshift hospital.

"Fafnir...this kind of nonsense is part of the reason I became an evil dragon you know." Crom Cruanch was looking at his phone with earphones on his head. "So hurry up and get on with the fight."

"Fine..." Fafnir opens his mouth and from somewhere in his throat, some kind of silver colored rocket launcher emerges.

"Do we really have to fight anymore?" Heracles picks some rocks from his gray hair. "I mean, Fafnir kind of ruined the mood, and you threatening Fafnir didn't exactly help your cause."

"To be honest, I couldn't care less about the Holy Grail, I was just told not to let you guys pass." Crom Cruach wasn't even looking up now, he was focused on his phone. "You guys can just go ahead, I've got more important business to take care of."

"So we can just go?" Issei undid his Crimson Queen state while the evil dragon mods. "Alright then, see ya I guess."

"I'm keeping this rocket launcher thing."

"THAT'S ONE OF MY TREASURES, A REPLICA OF TATHLUM."

"Cool, I guess this is payback for embarrassing Asia."

(A/N: Wish I could have made this chapter longer, but I decided not to because y'all can only handle so much action at once. So...yeah...be sure to spread the word of this series to get me more likes. Or if it's possible, make some bots to like my chapters. Okay that last one was a joke but I won't be mad if you guys did did make some bots...