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

The tram rolled silently in the Phobos Labs station. As the doors hissed open, everyone filed off, Doom carrying Velvet. They were met with minimal resistance, the most being a few armored zombies. They made their way to the entrance to the labs, covering each other as they stepped inside.

They all squeezed back to the walls, not wanting to be the ones to fall into what lay in front of them.

The entire lobby area of Phobos Labs had been blown apart, and seeping in through a crack in the wall was a wide river of toxic slime. It bubbled and hissed, the green liquid flowing lazily to the left.

"Ahh shit…" Jaune muttered, shoulders falling with his head. As this happened, everyone but Doom was trying to figure out a strategy of getting across. Doom, however, needed no plans.

Jaune felt himself being lifted off of the ground, letting out a small yelp as he was lifted. Everyone else turned just in time to see Doom hurl Jaune across the slime river. Jaune let out a grunt as he made contact with the floor on the other side, rolling about five feet before coming to a stop.

"What the hell was that for?!" he screamed. Doom replied with "It works, doesn't it?" while grabbing Ruby and repeating the process. He continued this until everyone was across, then he leapt into the river, wading across rather quickly.

As he pulled himself out, he drew his shotgun, firing it into the face of an approaching Spectre. He let the recoil take the weapon into a vertical alignment, then cocked it with one hand. Ruby and Pyrrha opened fire, putting down the massive beast and drawing the attention of several nearby hellspawn.

The group cut their way through the horde, littering the ground with bodies and blood as they split off. Jaune, Pyrrha, Nora, and Ren headed through the airlock leading outside, while Ruby, Weiss, and Doom headed up the stairs, Doom carrying Velvet over one shoulder. As they came to the top, they noticed that the only way to go was through a door to the right.

As they peered through it, a long hallway greeted them. They set Velvet down in a dark corner, and surrounded her with entrails and blood to make her look like a corpse. Then they set off, walking in single file. Many of the doors in the hallway were what appeared to small rooms, with nothing more than a bed, a small desk and chair, and a wardrobe filled with bloodied uniforms in each.

As they neared the end of the hall, Doom stopped and tilted his head to one side, as if he were listening for something. As the three sat in silence, the noise was heard. It sounded like throbbing, as if a giant heart was beating somewhere nearby. They continued to move, at a slightly faster pace than they were going.

Doom slammed his fist through the lock on the last door at the end of the hall. He kicked the door open, stepping in with his Chaingun drawn. The two girls stepped in behind him, and the three looked on at the giant room before them.

A giant pair of generators sat in the middle of the room, making a constant grating noise as they ran. Wires ran from the generators into just about everything in the room, including the massive doors that lined the room. Each of these doors were pressure-locked, and each had three thick metal slabs barring the doors. A lone computer station sat at the end of the room, flickering with various colors.

Ruby walked up to the device, pressing a few buttons and turning the transmission dial. She kept turning, and the screen flickered with color, before showing a dark room. As she watched, a pair of red eyes revealed themselves in the corner. They got closer, and she began to make out more features as it stepped closer.

As she saw it's feet, she could tell it wasn't human. It's skin was too pale, and it had claws where it's toes should be. As she saw it's legs, she saw burned, emaciated flesh that was covered in boils and burn scars. She saw it's waist, and she confirmed her earlier suspicion. There were no organs inside, and she could see it's spine and ribs through the gaping hole in it's stomach.

It stopped, and she could tell it was massive. What she could see was about as tall as she was, and she couldn't even see it's shoulders. It raised a burned hand that was yellow like old, unclean bone, pointing at the screen. As it did so, a wave of heat rippled across it's hand, before a blast of fire shot through the screen, shattering it instantly.

Everyone dodged out of the way as the fireball whizzed by, slamming into the generator with such force that the side of it shattered, setting fire to the generator. As the generator shorted out, the lights cut out and the many doors around the room opened. As the emergency generator kicked in, the dim emergency lights kicked on, revealing a horde of Imps and Demons, along with a quartet of Hell Knights.

Ruby screamed with fury upon seeing the Hell Knights, opening fire with her rifle. They didn't even stagger under the fire, and eventually, Ruby had to reload. Weiss covered her, shooting, stabbing, and slashing at Demons and Imps that were closing in. Doom leapt into the air, crushing a pair of Imps underfoot and blasting a Demon to shit with a barrage of bullets. They hacked away at the horde, the Hell Knights approaching swiftly.

As Ruby turned to avenge Blake's death, a green fireball slammed into her left side, throwing her to the floor. She tried to get to her feet, but her shoulders were pinned under the hooves of a pair of Hell Knights. One stood over her, raising it's fist and throwing a punch at her face. It threw another, and another, and another, until her face was bloodied and her nose was visibly broken. Then, it lifted her up by the throat.

Before it could do anything, however, a loud scream echoed behind them, accompanied by a blinding flash of white light. The Hell Knight had no time to react as it's heart was pulled from it's back by a supernatural force, causing it to fall to it's knees. Ruby and the other three Hell Knights whirled in that direction, and were shocked by what they saw.

Standing before them was a figure with a striking resemblance to Weiss. However, that's where the similarities ended. She had silver hair, a tattered blindfold covering both eyes, and fair, but scarred skin. The dress she was wearing was more akin to a robe than a dress, and in her left hand, she held a set of scales, the heart resting on the left side. In her right hand, she held a rapier, silver and gleaming as though it was just polished.

The figure let go of the scales, and almost immediately, the tray that the heart was on jerked downwards, almost throwing off whatever was on the other side. The woman nodded, extending her rapier towards the Hell Knight, causing it to burst into a spray of green blood and gore. The woman nodded again, and then she spoke, though it sounded like no voice any of them had ever heard before.

"The final verdict had been reached. Judgement has been administered, and the court will now dismiss." she said, but no sound was made. Instead, her voice seemed to materialize within their minds, sounding like a soft melody from an old era long forgotten. She gripped the rapier softly, but she held it with anticipation, as if she were expecting an attack.

And attack someone did.

All of the hellspawn in the room roared simultaneously, thundering towards the woman in a panicked and furious frenzy. The woman did not seem phased, instead swiping the rapier at the closest Demon. A streak of white light shot out, tearing through not only the Demon, but the pair of Imps and the Hell Knight behind it. She darted into the gap they made, stabbing into the stomach of another Imp and letting it slide off of her blade.

A Hell Knight behind her made contact with her back, but she used the resulting stumble as a means to attack her attacker. She made contact with the scales, and where she hit, the demon began to crumble into fine grey dust. She twisted away from an oncoming Imp, slashing through it and dodging from a Demon's bite. She danced and twirled through the horde of creatures, and if one looked at this without all of the demons surrounding her, they would swear she was dancing.

As the demons pulled back and tried for a different strategy, she pulled her trump card out from her sleeve. She raised the scales into the air, and spoke in a tongue that none of them understood or tried to understand. The scales began to glow with divine light, before erupting into a blinding flash and a grey cloud of dust. As the dust settled, the demons had been incinerated, and Weiss lay in the center of it all, a long scar stretching from her hairline, over her left eye, and ending halfway down her cheek.

The two other living inhabitants of the room were stunned. Ruby, because she had never seen anything so deadly and graceful as that woman in her life. Doom, because he now knew that they might just have a chance to not only stop the invasion, but contain the demon threat once and for all.

Both of them rushed over to Weiss, using what little medical supplies that were in the room to patch up her wounds and dragging her down the hall. As Ruby passed one of the cells that the demons were being kept in, she noticed a corpse sporting a slightly damaged yellow keycard. She pocketed the card, just in case.

As they reached the room where they had left Velvet, they found her not only awake, but healthy and healed. They were quite surprised, because even with their effort, that chest wound should have been devastating, if not fatal for a person. But, they'd seen plenty of weird shit up on Phobos, and they were willing to chalk this up as another favor from their mysterious friend. Doom was far more skeptical, but he finally gave in, willing to believe that their 'friend' had helped heal Velvet's mortal wound.

They were so focused on making sure her wounds were okay that they didn't notice the small, black veins slowly emerging from the corners of her eyes.

By the time they met up with JNPR, the group was ready to leave this hell hole. They inserted the keycard into the marked door, going through the airlock as once again, they dived back into being knee-deep in the dead. Nora started by preemptively firing a grenade over the edge of the lift, and as they rode down, they found the exploded corpses of an Imp and a pair of zombiemen.

As they wandered through the halls, Nora piped up with a question all of them had been asking themselves. "Where the hell did all of this come from?" she asked. "I mean, stone walls, pools of toxic waste, candelabras, all of this?! Where did it come from?!"

The rest to them pondered this question, and not even Doom had an answer. Everyone put out ideas, but most of them seemed too far-fetched to be true. As they were walking, they didn't even know that they had reached their destination until Ruby had to literally grab Jaune by the collar to keep him from stepping in the toxic waste

They found themselves in a large chamber, most of which was empty, and about half of the floor was melted into a pool of toxic sludge. A pair of pillars sat about equal distance from each other halfway across the pool, and on the other side, a lever sat, the light at it's side glowing dimly red.

"Well, shit. Are you sure there isn't another way?" Jaune asked, turning to Ren. The black-haired man shook his head no. The rest of the group sighed, knowing that someone would have to take a dip in the material. Pyrrha volunteered, and she stepped into the Radiation Suit, before stepping into the sludge.

It was thick, like walking through a pool of molasses, but with some effort, she made it across. The area was clear, which was unusual. Wasn't every place on this rock crawling with monsters? Nevertheless, Pyrrha pulled the lever, turning back to the walkway across from her.

As she got back to the dry land and began to strip off the Rad Suit, Jaune shouted, "Hostiles to the left!" before he raised his gun, popping off a few shots as a literal wave of hellspawn flooded towards them from both sides. A slug shell kicked Pyrrha in the chest, throwing her back into the acidic sludge. She struggled, trying to get out as her armor melted around her, before Doom dragged her out of the waste by one leg.

He kicked away an Imp right after, bringing the back end of his shotgun down on it's head. He flipped up the makeshift club, firing the weapon into a Demon's mouth. Nora stood still momentarily, and then whipped out her Grenade Launcher and fired right behind the approaching horde, thinning out their numbers substantially. Jaune lifted his chainsaw, plunging it into the head of an Imp, kicking away zombies as he sawed it through.

As the fight ended, Doom helped Pyrrha up as the rest of the team scoured the corpses for ammo. Pyrrha knew they had packed most of the ammo in the armory away with them, so where had it all gone? What had happened to it? They surely didn't blast it all away against these creatures thus far… right?

And if that was the case, would this keep up in the future?

She shook her head, clearing the thoughts from her mind. Thinking like that was a sure way to get distracted in a firefight. She accepted the pair of rifle clips she was given, and followed the rest of the team up the lift and out the door.

"Okay, where the actual fuck did this come from?!" Jaune wondered, staring straight ahead as the rest of them took in the sight.

The stone wall ahead of them had split, one half acting as sort of a walkway between them and the other raising up into the ceiling. On the other side, where a wall at one end of the toxic pool should be, instead sat a huge pair of stone doors, one of them slightly ajar. Large claw marks cut through them like knives on wood, leaving deep gouges where they stopped.

"Don't question it. We have more important matters at hand." Doom replied, drawing his shotgun and firing once. A wet slap echoed as a blurred corpse hit the ground, drawing the attention of multiple Lost Souls. Each one echoed a shriek, flying towards the ground like flaming rain.

"RUN!" Ren shouted, and they all sprinted for the stone doors. The Lost Souls slammed into the ground, exploding and leaving craters where they struck. To make things worse, each one that exploded in the toxic pool sprayed the stuff everywhere, getting a fair amount of the stuff on quite a few people. As they shut the massive stone doors behind them, explosions from the other side rocked the building, sending up small clouds of dust and debris in the room.

As the explosions stopped, the group let out a collective sigh of relief. They were safe, for now at least. Three of them (Ruby, Nora, and Pyrrha specifically) were forced to shed their armor, it being far too corroded to even be worn.

A quick search of the room revealed nothing of interest, save for the three corpses laying on the floor. The group continued onto the next room, which was filled with glowing computer screens. Most computer screens were displaying an error message, and quite a few were covered in blood. One was smashed in, containing the head of an Imp. A button sat on one of the walls, it's purpose not clear.

They found nothing else in the room, not even a corpse. With some hesitation and much discussion, Ruby stepped forward, pushing the button with two fingers and immediately raising her rifle as the wall slid upwards. When nothing popped out, she hesitantly peeked around the corner. She almost vomited at the sight.

The corpse was obviously Yatsuhashi's. If the ID tag didn't give it away, then his shaved-short black hair and tanned skin would have. His eyes were gouged out, leaving a small trail of blood running across his cheeks. His armor was ripped to pieces, and his ribs looked like they were stomped in. His stomach had been clawed open, his intestines spilled across the ground in front of him. Multiple claw marks were carved into his skin, and his blood was pooled around him, mixed with bile and whatever was the last thing he'd eaten was. Written up on the wall behind him was a single sentence, scrawled in blood:

YOU COULDN'T HAVE SAVED HIM

EVEN IF YOU TRIED

Ruby returned to the computer room, describing what she had seen to the best of her ability. After the first sentence, Velvet darted past Ruby, throwing her arms around the corpse and sobbing. No one could blame her. Ruby had been the same way when Yang had seemingly died, and they had all shed a tear when Blake died. Besides, Velvet and Yatsuhashi had a long history. They had been friends even before they had joined the military, and Velvet had almost demanded to be assigned to his team when they were shipped up to Mars.

After Velvet had shed all of the tears she had, she stood up, drawing her shotgun and marching down the hall. She had a look of determined fury in her eyes. The rest followed, most of them worried that she'd been too affected by that event.

As they marched onward, their path twisted, almost making a complete U-turn at one point. As they came to the brightly lit room ahead, an Imp leapt out of the shadows, clawing at Velvet.

The Faunus girl roared in fury, smashing the Imp with the back end of the shotgun and sending it to the floor. She tossed the weapon away, straddling it as she began to punch it repeatedly. A loud thwack rang out every time she punched it's head into the floor, causing a bloody mess to appear with each strike. She grabbed her shotgun again when it was on the edge of life and death, using it only as a makeshift bludgeon to smash it's head into a bloody pulp. She whacked it's dead body for a solid ten minutes afterwards, screaming in fury, heartbreak, pain, and sadness the whole time.

After she had felt that she had beaten the pile of bones and flesh that used to be an Imp enough, she tossed the wreckage of her shotgun away and fell to the floor, sobbing again once more. The rest of them stayed there for a moment, before Doom walked over to her and, with a level of gentleness and compassion that didn't fit his personality, picked her up and patted her shoulder. The entire exchange went without a single word spoken, but a message hung in the air that everyone could understand: I know how you feel.

After a long moment, the group collected themselves and marched into the room beyond. The room was large, containing a quartet of stimpacks, an armor repair kit (which was promptly grabbed by the three who still had armor and weren't incredibly depressed), a blue keycard, and a holographic security projector. The projector was slightly damaged, but Weiss was able to get a good few days worth of footage out of it. As she set it up, the others conversed quietly.

The projector sparked, sputtered, then whirred to life as four separate holographic technicians appeared. The four were idly chatting as they walked through the area, and right after the four turned the corner to head down the other flight of stairs, a bright flash of light erupted from the center of the room, revealing a quartet of Imps and a Hell Knight. The Imps charged, and they successfully managed to take down one technician before the others reacted. One technician bolted down the stairs, but he met his fate when the Hell Knight hurled a fireball at him, frying him on the spot. The second living technician froze, and was swiftly gutted by the Imps. The third, in a blind panic, ran from the Imps, but wasn't swift enough to escape the hands of the Hell Knight. The huge demon lifted the woman off of the ground, seeming to grin as it slammed her head into the floor, knocking her unconscious almost immediately. It repeated the process several times, and when it was done, her nose and jaw were busted to pieces and she was bleeding out. The Hell Knight stomped up the stairs the technicians came from, leaving the Imps to devour their kills.

Weiss fast forwarded through a day's worth of footage, stopping at a specific point. The Imps had picked the corpses clean, and the bones lay in a secluded corner. The Imps were staking claims to the areas of the room, or at least something like it, considering the ways they were dragging their claws across the floor and jabbing at each other.

As the animalistic creatures did this, the Hell Knight wandered back into the room. The lesser demons quickly stopped what they were doing and bowed to the greater fiend, but it seemed uninterested with them, instead wandering down the stairs and to the blue access door. It stared for a moment, tapping at the door and then listening. It seemed content with whatever it was doing, turning to head back up the stairs.

Or, at least, it would have. Instead, it turned about halfway, then its intestines burst open, causing it to split in two, falling dead. A figure appeared from the door, holding his hand out with his thumb, middle finger, and pinky outstretched. He turned his gaze, and the group watching the scene unfold got a good look at him.

The first thing that they noticed was that he was tall. He stood at almost seven feet, and he seemed incredibly thin and lanky. Despite this, he moved fast, with a speed set in by adrenaline. He wore a lab coat, slacks, and loafers, definitely not a fighter by choice. On the palm of his extended hand was tattooed a circle with a pair of lines running through it in an inverted cross shape.

He flicked his hand into a pocket, producing a pistol moments later. The Imp closest to him regained its senses, letting out a high pitched screech and charging. Two clean headshots later, its legs gave out and it fell over dead. The other three screeched, one leaping onto the wall and climbing into an air duct while the other two began to hurl fireballs at the man. He ducked, taking down one more of the Imps before he was grazed with a fireball. He growled in pain, shifting his aim and killing it.

He ejected the magazine, slapping a new one in. He pulled a few things out of his pocket, placing them on the table and turning around. Pausing for a moment, he pulled one more thing from his pocket and tossed it into the air vent, before walking down to him the blue access door. The holographic footage cut out just then, the projector sparking and sputtering as it broke down again.

Jaune fished out the object from the vent, revealing a light amplification visor. It was ultimately decided that Ruby, as the leader of the mission, would get them. As she slipped them on, distant noise began to sound. When everyone was geared up and ready, they opened the door down the stairs and headed into the very dim room beyond.

If they had stayed for a minute longer, they would have noticed the small crowd of flies slowly flying out of the vent.

"Wow, so that's what that generator broke." Ruby said, switching on the amplification setting on her vizor and noting the power level in the corner. The rest of them stumbled in, squinting in the light. Ruby looked around, noting the two pillars near them and calling back to the rest of them "All clear!"

The group fanned out, scanning the immediate area with a quick sweep. The room was filled with corpses, so much so that they had to intentionally step around the corpses to progress. Flies buzzed around the room, occasionally bumping into one of the walls or people in the room. A large coalition of flies were gathered in one corner, buzzing around a particularly bloated corpse.

They swiftly searched the room, coming up with a few grenades and another magazine. They were just about to leave through the door on the other side of the room, when the flies began to intensify on the corpse. Everyone turned, staring at the corpse as it stood up. A shot was fired from somewhere in the group, striking the zombie in the shoulder but not stopping its stride. The group opened fire, and the zombie blew apart in a huge shower of blood, but it was not the end.

The flies erupted from the corpse, swirling around a 5 foot cylinder as the buzzing of their wings intensified. A fire grew in the center, expanding and consuming all of the flies in the blaze. As the fire disappeared, a fresh, new horror awaited their eyes.

The creature was humanoid, but definitely not human. The most noticeable feature was its scaled skin, grey and dry like dried meat. It's head was covered in black bony plates, the only separation between them being two for it's glowing red eyes. It's bottom jaw was split, like a pair of mandibles on an insect. It's teeth were sharp, and it had a hunch of a creature that ran on only all fours. It raised its long arms, roaring as they opened up into wings with smooth, ash grey skin there.

It leapt forward, clawing for Ruby's throat. She screamed, opening fire and managing to get a shot off to it's head. The shot bounced off of the bony plates, but still managed to disorient it enough to only plow her into the ground. It scrambled to it's feet, just as Doom kicked it in the face, sending it flying backwards. It landed, flipping off the ground and spreading it's wings again. The rest of them opened fire, but before any of the shots hit, it vanished.

"Shit! Find it! Spread out!" Ruby called, getting off the ground and retrieving her rifle. They split up, searching the room for any signs of the creature. These things couldn't just disappear… right? It had to be somewhere!

As they were searching, something splattered on Nora's helmet. Slightly disgusted and intrigued, she wiped some of it off to get a better look at it. It was thick, like mucus, and it was greyish in color. Curious, she looked around. No one had thrown anything, and unless corpses suddenly started oozing random liquids, their was only one direction it could have come from. She looked up.

It happened so fast that there was almost no time to react. The creature leapt out of one of the vent shafts in the ceiling, clawing Nora across the chest. She screamed, it's claws raking long scars from her shoulder to right under her left arm. Everyone else opened fire, but it grabbed her by the leg and leapt up to the ceiling, dragging her into the vent behind it.

Inside the vent, Nora kicked and struggled, but the demon held firm, dragging her through the metal shaft with it. The metallic clang of it's steps alerted many hellspawn nearby, she was sure, but what she was worried about was where she was going. She took many sharp turns, and pretty soon, she wasn't sure if she could make it back.

Eventually, the scaled demon stopped, punching out a vent shaft and tossing her through. She landed on the floor, scrambling to her feet as it landed on the floor. She was without her weapons; she had dropped them when she was thrown in the vent. She began to look around the room for a weapon when it charged at her, swiping it's claws. She ducked, running to the other side of the room. As it charged again, she grabbed the closest thing, a broken piece of pipe, and jabbed the sharp end into the creature's stomach. It screeched as the pipe slashed through it's scaled skin, but it smacked away the crude weapon and kicked her in the knee.

A sharp crack echoed through the small room as Nora's knee bent in the wrong direction, eliciting a cry of pain as she collapsed to the ground. It grabbed her by the shoulders and bit down on her neck, drawing blood and causing another cry. It then tossed her to the center of the room, where it crawled forward to finish her off.

However, just when she thought it would be the end, a green flash of light erupted from underneath her. The demon scrambled backwards, acting as though the light would hurt it. The green glow surrounded her body, and suddenly, it felt like she was being torn apart. She was to weak to scream, so she just rode out the pain until…

She found herself back in the lobby. She raised a hand, switching on her helmet comms as she slowly faded into unconsciousness. "I-in the... lobby… Hel...p m-me…" were her last words before she slipped into darkness.

The rest of her team found her there, lying with a peaceful expression on her face as her blood slowly pooled beneath her.

Well well well. Look who's back.

I'm really sorry about stopping this story for a while, but I had too many things to do, then my computer fucked up, then I lost a lot of motivation for writing this once I got the chance. I apologize, and I'll try to get the next chapter out soon.

Anyways, cliffhanger! I had a lot of plans for this chapter, and I scrapped more than a few of them, but I hope you like it. And Nora… well, let's just say I hope you liked her while she was here.

Also! After I post the ninth chapter of Episode One, could one of my followers who can write RWBY do a reading of this story? That'd be nice. But not necessary.

Anyways, if you guys have anything to add, questions, or just want to talk, please leave me a review.

That Random Demon, signing off!