I don't own Doom or RWBY. I only own any OC's I may use.

The group ran, coming to an open courtyard. Not really thinking clearly, they bolted into the closest gateway they came across. They ran, flocking zombies, Imps, Spectres, and Demons behind them in a hope to slow their pursuer. They came to a large security rotunda at the top of a flight of stairs. They stopped for a moment to catch their breath, looking around at the bloodstained walls as they did so.

"What now?" Ruby asked between breaths. She was fast, sure, and she had plenty of stamina for running, but even she had her limits.

Blake stood up, having sat down for a moment to stretch her legs. "We have three options. One: we can try to reason with him."

As she said this, an explosion shook the room, and the head of a Demon landed in front of them.

"Which I'm sure none of us want to try. Two: We can keep running." Blake continued, kicking the head away. "He's much faster than us, and he will probably catch up in no time if we have to look for keycards. Three: We can hide out in here. These doors are completely bulletproof, and when they're locked down, nothing short of a ship crashing into them will get them open."

Everyone else looked at one another, then said in unison, "Let's hide."

As Blake turned to the door, looking for the manual release lock, monsters began to pour out of the rooms around them. The group raised their weapons, but the hellspawn weren't intent on killing them, as they flooded past, not making any moves to attack them. The demons charged down the stairs, roaring with fury.

Blake paused, looking over her shoulder at the demons before hitting the manual release. As the door slid into the ceiling, Ruby swore she thought she saw something move in the darkness.

"Blake! Look out!" Velvet yelled, leveling her shotgun at something and firing it into the darkness. As the shot lit up the darkness, a pair of brown goat legs became visible for a second, before a grey, clawed hand shot out, grabbing Blake and pulling her in. Ruby shined a flashlight clipped to her belt into the darkness, then almost dropped it at what she saw.

Two tall, grey-skinned figures held Blake by the arms. They were massive, almost 8 feet tall, with brown haired goat legs and shining black hooves. A pair of shining black horns curved out of their heads, wickedly sharp and chipped in places. In the opposite hand they held Blake with, each were holding a ball of green flaming energy.

As the group watched, they hurled Blake into a wall, then raised their hands, hurling the balls of fire at her. She didn't have enough time to react as both hit her, slamming her against the wall and lighting her armor on fire. She screamed and writhed, the fire burning and blistering her skin and lighting her hair on fire. The Faunus girl tried to crawl with what little strength she had left, moving towards the door. The two giant humanoids watched with sadistic glee, one of them crushing her knee to make it a little harder. She was on the verge of tears at this point.

The humanoid on the left put one of his massive hooves on the back of the cat faunus, stopping her movement. She looked up to see the other one standing in front of her. She slowly lowered her head, waiting for the end. The creature lifted it's leg, crushing in her head with a curbstomp.

The two satyr-like creatures noticed the others, who were paralyzed with shock and fear. The two demons looked to each other, nodded, and began to charge. However, just as they were closing in on the group of 7, a bellow of fury echoed out as a green fist connected with the leading satyr-creature's face.

(Put on some badass Doom music)

The green armored man hit the ground running, grabbing his shotgun out of the backpack and blasting the other grey demon in the chest. The demon stumbled back, recovering just in time for a flying axe kick to the face. The armored slayer turned, punching away the fist coming for him and returning with a shotgun blast to the grey demon's face. As it fell back, he grabbed it by the leg, swinging the massive creature into it's friend. The two demons flew backwards about ten feet, landing on their asses. The first one got slowly to it's feet, just in time to receive a right hook to the face.

The demon-slayer punched the creature again, from the left side this time, before grabbing it by the horns and ripping it's head clean off. It sprayed blood, grabbing at it's throat for a few seconds before going limp. The blood-sprayed man slammed the head into the other one, then grabbed it's right arm and ripped it off in a spray of blood. It screamed, grabbing at it's stump for a moment before turning back to the man.

The man acted as though he was a baseball player winding up to hit a homerun. He swung the arm, snapping the demon's neck with one hit. It slumped over, and he walked over, curbstomping it's head in.

He straightened up, stepping into the security checkpoint for a moment, coming out with a huge silver chaingun in his hands. He pulled a bandolier of bullets out, loading it into the massive gun and giving it a test spin, firing it into the corpse of the grey satyr monster. As he packed up the silver beast, the seven slowly began to back away, hoping to whatever god or goddess existed that he wouldn't notice them.

But, fate liked fucking with people. He had already noticed them, and he began to march over to them. They screamed, taking off, and the man took chase. He was faster, and by the time they had made it to the door, he was ahead of them. He grabbed Weiss by the hand, and she tried to pull it away. But somehow, with that one touch, she knew that if he wished to hurt her, she would have been hurt. And right now, he didn't want to hurt her.

She relaxed slightly, but was still slightly on edge. After all, this man had her by the hand, and she had earlier seen him rip off the arm of a creature twice her size. He moved his thumb slowly over her wrist, and she realized what he was doing.

He was checking her pulse. He was trying to see if she was alive.

"H-hello, s-sir?" Ruby called over to him, and his gaze snapped towards her, the gentle feeling gone from his body. He stared at her for a moment, dropping Weiss's arm from his grasp and looking across the group of seven. He continued to stare, before speaking in a voice that seemed long unused, but was deep with his emotions and battle-worn thoughts.

"Are… you… alive?" He asked, and they all nodded almost too fast. He didn't seem to notice, and he let out a sigh of relief. He straightened up, cocking his head to one side as if he was listening to something. He pushed past them, charging at a Nightmare Imp that was covered in glowing purple energy. As he charged it, something incredible happened.

The Imp moved at almost blinding speeds, diving through the man's legs and bolting out one of the many doors. The man growled, charging through the door the Nightmare demon ran through.

"Wait! We don't even know your name! What do we call you?!" Ruby shouted as the group charged after him, almost running right into the demons he was staring at.

He paused for a long moment, asking only, "My name?" Ruby nodded hesitantly, and he looked at her. He cracked his knuckles slowly, then cracked his neck slowly. Finally, he spoke, uttering one word that described all of him. Every layer that he had, every emotion he felt was all spoken in this word:

"DOOM."

He then drew something from the backpack. It was a long, dagger-like blade with a skull at the end, and the blade had an eye-like gem in the middle of the handguard. He flicked it forward as if he was flicking a lighter, and the blade split, extending a blade of red energy covered in runes. As he did this, an Imp charged forward, leaping forward with it's claws.

A swish of energy sounded, and the Imp fell, slashed in half by the energy blade. 'Doom' dropped into a defensive stance as a Spectre charged him. He swung the blade four times, chopping off both of it's arms, it's jaw, and then chopping it in half. The runes on the blade flared, and the glow of the blade grew weaker.

The rest of the demons roared, charging forward. The seven recovered from the stupor of watching this man effortlessly tear through demons with a laser sword, and drew their weapons. That's when all hell broke loose.

Ruby let loose a burst of rifle shots, dropping two Imps, then stepping back as a claw swept past her face. Weiss stabbed the Imp, then fired a pair of revolver shots into another one of the creatures, it's body splatting across the ground.

Pyrrha stabbed a Nightmare Imp that darted at Weiss, catching it on the end of her bayonet. She then pulled the trigger, ending it's life and the existence of it's head simultaneously. Nora fired grenades into the horde, spraying the walls with blood. When she ran out, she flipped the weapon over, clubbing Imps and zombies to death.

Ren darted into the horde, stabbing Imps in the back and blowing their heads off. He drew his knives, leaping off an Imp and jabbing them into a Demon's eyes. Velvet strafed around the horde, blasting the hellspawn to pieces with her shotgun.

Jaune jabbed his chainsaw into a Spectre, sawing it to pieces. He spun around, taking an Imp's head off and kicking it away. He swung at a Demon, but the massive beast sidestepped and sunk it's teeth into it's arm. Jaune screamed dropping the Chainsaw and punching at it. The Demon held on, until the energy blade erupted from it's face, splattering Jaune with blood. Asthe demon fell over, 'Doom' retracted the energy blade, holding the handguard over Jaune's arm. As he watched, blue lightning came out, hitting the teeth marks and slowly regenerating the torn flesh.

Doom stood back up, enabling the energy blade and decapitating a group of Imps. He leapt forward, slashing a Demon in half, then grabbed another that was making a charge for him. He grabbed it's horns, headbutting it and throwing it to the ground. As it hit, his foot was already in the air, coming down on it's head and smashing it into a pool of blood.

The fight over, they patted down the corpses, only getting a few pistol mags and (surprisingly) a reload for Weiss's revolver. They moved out, collecting the blue keycard and heading down one of the halls. As they walked, they told Doom their stories of how they got here. When asked for his, he simply replied, "Went through portal. Woke up here. Found a weapon. Continued my mission." He refused to elaborate, saying that the story was "too long to be told here."

They eventually found a blue access door, and Velvet slotted in the keycard. As the door raised, a dark maze of hallways awaited them. Ruby checked the Computer Area Map she had found, and confirmed their suspicions.

"Looks like we're splitting up again. Alright, same pairs?" Ruby asked, and everyone but Velvet nodded. Velvet looked a little afraid, and being paired up with the 6' 6" armored berserker didn't help one bit. They split off, heading to the right along with Ruby and Weiss, who split off moments later.

They walked in silence for a while, before Velvet spoke up. "So… do you have any family?" She asked, trying to ease the tension.

Doom stopped, standing still for a moment, before continuing at a faster pace. "Used to." he replied, then added, "Don't bring that up again."

She apologized, and they continued to walk in silence. As they came to a split path, Velvet swore she saw movement to her left. As she turned, she was tackled by something, something she couldn't see in the dim lighting. She tried to swat it away, but it broke her arm and ripped off her chest armor. She screamed, and would have been clutching her arm if the thing wasn't on top of her.

It clawed into her chest, and she screamed again. It's claws remained, and as she watched, a purple glow surrounded her wound and the claws inside of it. She had flashes of her friends dying, her family being ripped to pieces, her worst fears coming alive in front of her, until…

The creature was pulled off her and slammed against the wall by the armored man. It scrambled to it's feet, but he punched it into a wall, then grabbed it's jaw and ripped it off. It screeched, and he threw it against the wall, ending it with a shotgun blast. He then reached his hand inside of it for a moment, before pulling out a glassy, eye-like ball and stowing it away. The Nightmare Imp became visible as soon as this happened.

Doom ran over to Velvet, drawing his blade and deploying the handguard. He held it first over the broken arm, which regenerated to the point that the bone had healed, but there would still be a huge scar and bruise where it happened. However, when he tried to heal the chest wound, the handguard sparked, not releasing the blue lightning. He cursed, picking her up and carrying towards the end of the corridor.

He laid her down on the table, busting open a medkit and pouring some antibiotics on the wound. He stuck a syringe full of anesthetics into her arm and she drifted into unconsciousness.

"Well, each of us found nothing, and Velvet hasn't reported back yet. Should we look for her?" Weiss asked Ruby. The two were waiting at the entrance of the corridor Velvet and Doom had gone down. They'd been waiting for about ten minutes, and they were worried that the two had gotten hurt, or worse, killed.

"Velvet knows how to handle herself. And besides, Doom can surely defend himself and her if he needed to. I'm sure they're fine." Ruby said back, waving Weiss off. "Besides, we all need the break. Go relax and take a nap."

Suddenly, a loud shotgun blast echoed not too far away from them. They whipped around, weapons drawn, to find a Demon being stabbed by the dagger blade of Doom's sword. As they watched, the skull on the end opened it's mouth, and red lightning arced from the Demon and into the black void of it's mouth. The eyes of the skull lit up as the Demon's golden ones began to go dark.

Doom pulled out the blade, turning to the two girls. "Where's Velvet? What's going on?" Ruby asked. Doom didn't reply any more than pointing down the hall he came from, which he turned and ran down afterwards. They had no choice but to follow.

As they ran, Doom filled them in. "Nightmare Imp. Caught us off guard, and clawed her chest. We killed it, and I did my best. I fear, though, it may not be enough."

"What the hell do you-" Weiss tried to yell at him, but he stopped, causing her to crash into his back. She stumbled back, beginning to scream at him to watch where he was going. As she looked forward, she stopped, jaw hanging open in shock.

Velvet was lying on a maintenance bench, a makeshift cast wrapped around one arm. Her chest was bandaged too, but Doom didn't have nearly enough supplies to bandage the full wound. Three massive claw marks tore across her chest, going from her right shoulder to the left side to her stomach. Blood caked the wound, and it was purple around the edges, reeking of infection. Ruby unwrapped the rabbit Faunus' arm, and almost vomited.

The entire arm was purple. Swollen, bloodied, bruised, blistered. All of these words could describe what the arm looked like. Ruby could see where the bone tore through her flesh, as it wasn't fully healed. Black liquid flowed through her veins surrounding her wounds, and it looked like it was getting worse.

"Oh my Oum…" Weiss trailed off, covering her mouth with her hands. Ruby steeled her nerves, grabbing a medkit off of the far wall and ripping it open. She pulled out the contents, patching up the wound as best she could. What she couldn't fix was the black liquid, which continued to spread.

She radioed in for the others, and once they were all assembled, they headed through the yellow access door. They came to the tram station, which was mostly torn to shreds. The tram was still functional (thankfully), and they all boarded. As the tram rolled off, they all sat in silence, watching Velvet's unconscious body rest.

Hyacin stood in front of a vault. This vault lead to something very powerful, he knew. He'd helped build it, after all.

A knock rang out on the door behind him, and he turned away from the vault. He pressed a button on his scroll, unlocking the door and turning to the person standing behind it.

The woman stood about 5'9", with long, ash-colored hair, tanned skin and orange eyes. She was wearing combat armor, clearly prepared for this invasion. She was caked in blood, and she was sporting a heavy rocket launcher, which she promptly tossed to the side. She grinned at Hyacin, simply asking, "Where is it?"

"Straight to the point, I see. It's on the table." he said, stepping to the side and watching as she bolted to her new prize. "Fresh off of the assembly line, too. We were almost finished, and I just had to make a few adjustments."

She lifted the massive silver flamethrower (think of like the Mancubus cannon from Brutal Doom), checking the fuel gauge and grinning maniacally. She raised it above her head in a feat of surprising strength, despite how thin her limbs looked.

Hyacin grinned, whispering in her ear, "You know, I'll need a favor in return." She grinned, turning back to him with her head tilted to the side, as if questioning his statement. He leaned much closer to her, getting very close to her face and whispering, "I have some friends coming in from Phobos. Once they come in… well." He chuckled darkly.

"Bring them to me."

Okay, before I go hide in a corner from all of the people that are pissed at me killing Blake, I have to talk about a few things.

I think of the Crucible as a weapon that upon a hit, it can steal some of an opponent's raw Hell energy. Once it does this, it either repairs any damage dealt to the wielder with this energy or it stores this energy within it's hilt. It can use any stored Hell energy to heal wounds (think of it like a mini Mega Health, heals to 100% health and armor, but only if the target is subjected to 30 seconds or more).

Second, I know that I will be continuing this story through the events of Doom II and possibly the Final Doom games, but do you guys want me to keep writing on this story or do you want me to break this up? I would really appreciate suggestions.

Reviews:

Chris1037: TYSM MY FRIEND! I really think my writing quality is shit compared to other authors, but hearing good things about it is very uplifting to me!

Neema Amiry: You are very welcome! I got a lot of inspiration from The Doom Chronicles by Obsidian Productions, so check that out if you haven't already.

So, with that being said, Blake is dead and Velvet is infected with… something. Now if only there was a way to fix all of this…

Anyways, if you have any story ideas, questions, or OC's you might want added, leave a review.

That Random Demon, signing off! And going to sleep. It's 4 am where I live and I have a lot of shit to do tomorrow.