Highschool dxd and DooM crossover.
Notes for challenge!
Issei must either have the Heart of Hell or the Soul Cube for his sacred gear.
Doomguy aka The Doom Slayer must appear at least once.
Some demons of old aka doom demons must show up from time to time.
Issei x harem or a main non oc female. This IS highschool dxd after all.
Issei can't side with heaven or the fallen angels although Raynare siding with him is okay.
Story time!
Chapter 1: Life and death and resurrection.
Doom guy aka John moaned in pain as the rescue squad sprinted towards the docking bay with him being dragged along by two recruits. He was stupid to think that just because he closed the portal that the demons couldn't still cross the rift in dimensions. A blue plasmaball exploded to the left smashing a marine into the wall with a sickening snap. He died before he could even hit the floor.
A vent on the roof fell open and a large floating ball of hate with a large maw and tiny beady eyes roared at them as it was showered in lead. It fired a yellow ball of energy upwards igniting the gas main. A flash of pain and fire and they knew no more.
John expected the same. He wasn't completely wrong. He found himself floating in a vast emptiness. The sound of distant wing beats could be heard. In front of him the soulcube and what looked like a human heart and grenade merged together floated in front of him.
"Doomslayer." The multiple voices from the soulcube sounded. "Conquerer of hell, scourge of evil, traverser of the pit."
"DeFeAtEr Of ThE cYbErDeMoN" a broken gutteral voice sounded from the heart. "wE gRaNt YoU nEw LiFe!"
"BE REBORN!" both artifacts synchronized before flying forwards, merging into his chest. With a gasp, he vanished.
A few moments later a purple eyed gothic lilita girl floated over. "odd. They normally leave food." She monotoned before glaring in annoyance towards the sound of wing beats.
Back in a different version of earth John gasped in pain, sputtering and coughing as a surprised redheaded girl looked on above him as she held his head in her lap.
" Damn. Eight pawns. You are a powerful one aren't you Issei?" She muttered. Like a dam breaking memories flooded John's mind. He was reincarnated as some perverted Japanese brat. Oh how he HATED that fucking cube. That crow girl, Yuuma or as he found out not long ago Raynare was forced to kill him or her friend, Asia would be killed, it definitely justified his murder, but it didn't mean he was still pissed about taking a glowing spear to the gut.
"Thank you for saving me." He muttered hoarsely.
'Use us, let us heal.' He heard the soul cube in the back of his mind. He accepted. With a double hum and rattle of moving metal the soulcube materialised in his left hand, scaring Rias, if his new memories were correct, greatly. The cube pulsed white and he could literally feel his wounds closing.
"Holy shit. The bane of Satan." Rias uttered in shock. Her pawn had one of the most powerful sacred gears in existence, capable of felling even the most powerful demons of old in three strikes. Shivers went up her spine in both fear and hope. Hope that she might not have to marry the arrogant prick Riser.
"Rias sempia? Why aren't I dead?" Issei (I'll refer to him as such from now on) asked in confusion.
"You see, I reincarnated you as a Devil." She stated as black bat wings sprung forth from her back. He shot upwards and dropped into a combat stance, the heart of hell in his hands as it pulsed red. Rias's eyes went even wider at this. The heart of hell was stolen during the last war by the angels. One of two prototype unholy gears, meant to combat sacred gears. It could alter one's physical abilities, making them faster, stronger and more durable. For her pawn to have it was damn near impossible.
"Okay, drop the disguise. What are you? A imp, a lost soul. A fucking hell knight?!" He demanded.
Rias was shocked. He knew of the demons of old. The ones locked away in the lowest depths of hell in the darkest pits. She steeled her nerves. " I am as I am now." She stated. "Ria's Geromy, one of the 72 Pillars of the underworld." She reached out her hand cautiously. " Whatever you've heard, were not like the demons of old."
"Well I'd like to differ." Issei growled when he heard a beep-beep from his pocket. His PDA. He still had it. It flung from his hands and began playing what he saw in hell's darkest pits. Rias's eyes opened in shock and lust as she saw him tear the old demons apart. He killed the fricken guardian and CyberDemon for fuck's sake. Realising she was being glared at. She gave him the PDA and gave a saucy wink and grin. "Welcome to my peerage Issei cun. Seeming as you have experience in the supernatural I'll forgo that little speech and skip ahead. As a newborn devil you'll grant wishes for humans and kill stray devils, no doubt you'd be great at that part."
"This'd better not be a trap, otherwise I'll ram the soulcube through your face, hear me?" Issei growled. Ria's nodded. Surprised that the loveable goofball, when he wasn't being a pervert, had changed so much when she revealed what she was. Sure he battled through the sealed sections of hell but such a 180 in his personality made him seem like another person entirely. She shuddered slightly at the killer intent he had given off. Somehow, she just knew that he'd get along with Akeno.
"Come on, we'll go meet the others." Rias stated with a small smile as she waved her hand, this made a pentagram appear on the floor asides them. Issei bent over and began examining it. He shook his head and scoffed. " what?"
"No way am I using that unstable thing, it'll be too flashy as most of the energy is lost as light." Issei muttered. Having traveled though so many of the damned things he knew a bit about them, that and he used to study the occult in school. Guess he gets to do it all over again. He then traced a new pentagram into the dirt which glowed dully orange with hints of red. He stood in the center, holding out his hand for Rias. She begrudgingly accepted and stepped into the circle. With a swift shoe movement, he completed the circle activating it. They appeared in a room with a large pentagram, a coffee table and a few couches. Instantly people, no, devils rushed in.
"President?" A black haired girl asked. "Who's circle was that? How isn't he out cold ara ara?"
"Akeno, Issei made the circle." Rias stated before turning to Issei. "How did you know how to make that?"
" seen enough imps and Maggots appear using it to learn how to myself." Issei shrugged. The room asides Rias looked horrified that a human had encountered the demons of old.
"Ara ara ufufufufu. Big bad Issei fought imps did he?" Akeno giggled.
"He did more than that. He killed not only the Guardian but a cyberdemon." Rias stated. Akeno fell over having creamed herself as a red blush of lust covered her face, everyone else was shocked stiff. Killing Cyberdemons were the equivalent to offing a 12 winged archangel. Doing so meant not to fuck with them. Even the Satan's paled in comparison to one.
"Ara ara. Me likey." Akeno muttered as she drooled slightly. Issei looked a bit shocked at such behaviour but looking around, this was probably normal for them.
"Right introductions. That is Akeno my queen, she is Koneko my rook, don't let her size fool you, and Kiba, my knight." Rias introduced a girl with cat ears and a blond guy who looked annoyed.
"Alright then. Nice to meet you all but make a move against me and I won't hesitate to kill you." Issei warned. They nodded in understanding and Akeno squealed as the damp spot below her grew larger and her blush brighter. He sighed before disapearing in a flash of orange and reapeared in his room. With a tired yawn. He flopped onto his bed and fell asleep.