So, hey. I was reading through some of my favorite Doom and RWBY stuff, and I realized that there is a lack of this stuff in the crossover section of those two. So, I decided to do this.


Ruby was looking forward to having a little free time this weekend. After all, up here, you took whatever free time you could take. And Oum knows, Ruby's team hadn't had a wink of sleep this week.

But, of course, the AAC didn't care about that.

And that was why Ruby and her team were trudging down the hall, all in terrible moods and all holding various caffeinated drinks.

"Why did it have to be us?" Yang, Ruby's sister, groaned, before taking a generous swig of the energy drink she was holding. Weiss, Ruby's second in command, scoffed, swirling the coffee in her mug before taking a sip.

"Oh come on, it can't be that bad of an assignment. We'll be done before you know it," she said, patting Yang on the back.

"Hey guys, what's going on?" Jaune Arc said, stepping out of the fairly large room that he and his team inhabited.

"Oh, you know, another assignment. Like the thousands we've done this week." Blake said, sipping the bitter tea out of the thermos.

"Oh, we're headed that way too. Mind if we tag along?" Jaune said, already with a bag slung over his shoulder.

"Sure!" Ruby said in a somewhat energetic voice, far ahead of the rest of them. A few moments later, Jaune stepped out, followed by the rest of his team. As the small group of eight turned into the briefing room, Ruby turned to Jaune.

"Wait, you're coming in here too?" Ruby asked, tilting her head to the side with one eyebrow raised.

"Yeah! Jaune got some message about an urgent mission and that we needed to meet here soon." Nora said, stepping past Ruby before exclaiming, "I wonder if we'll be headed up to one of the moon Bases. I heard that something crazy was going on up there!"

"Nora, I doubt that we'd be sent to the moon bases. There are much higher ranking Marines that handle matters up there." Ren said, patting his childhood friend on the back before sitting down.

As the group of eight sat down, a figure walked up to the front of the small briefing room. She wore a white blouse under a general's jacket, a pair of long black pants, high heels, and a pair of glasses. A name tag on the front of the uniform read Major Glynda Goodwitch.

Major Goodwitch's normally calm face was showing hints of concern, fear, and a little regret, all emotions that weren't common on the Major. She composed herself, gripping the riding crop she was holding tighter.

"Good evening, Marines. As some of you know, we lost all contact with the Deimos moon base a few weeks ago." She spoke, causing a murmur to go across the group. She waited for the talking to die down, then continued. "About three days ago, we received a transmission from Phobos, with a rather… horrifying message."

As she said this, she pushed a small button on a panel on the wall, and the lights dimmed. A video transmission began to play, but it was fuzzy, and there was no color.

"Hello?! Hello?! Is anyone there?!" a man said, his body covered in scars, holding the recording device close to his face. He was shaking, curled up under a desk and covered in blood.

"I want out of this shithole! I want out, you hear me?! I don't wanna fucking die! What are these things?! You know what, I don't fucking care!" The man screamed, as a chorus of screeching echoed near him. "These damn things are killing people! They've done something to the Marines, and now they broke out and are killing people! I want to fucking get out of here!"

The screeching got louder, until it seemed as though it was in the room. The man stopped screaming, as something began to stomp around. As he sat still, his breathing became heavy, and he was white with terror. As the stomping stopped, he breathed a sigh of relief. As he did this, the desk was ripped off of the ground. The man dropped the recorder, revealing a creature that looked almost like a shaved gorilla with horns and glowing golden eyes.

It grabbed the man with its tiny, yet strong arms, lifting him off of the ground. The man screamed as his lower body was swallowed into the huge maw of the beast, and it bit down. The bite was swift, cutting everything off from the stomach down. The rest of him fell to the ground screaming, and he began to crawl towards the recorder.

"HELP US!" he screamed, cutting off the recording just before the gorilla monster crushed his skull with it's foot.

The room was sitting still in a stunned silence. As the projector shut off, the lights switched back on. Major Goodwitch stepped back to the front, gathering the attention of the rest of the group.

"Yesterday, we sent a heavily armed team up to Phobos, but we lost contact shortly after they landed. Your mission, both teams, is to retrieve any survivors from the moon base. You are authorized to use lethal force on anything obstructing your mission." With that, the Major walked off, unlocking the armory in the process.

The group wasted no time in securing as many weapons from the armory as they could. It was mostly filled with sidearm pistols and shotguns, but Jaune's second in command, Pyrrha, managed to lay her hands on a pair of semi-automatic rifles and a pair of bayonets.

In total, Ruby ended up with a semi-automatic rifle with a built-in scope, Weiss ended up with a pair of sidearms and an old cavalry saber, Blake had a sidearm and a rather large combat knife, and Yang ended up with a shotgun and a pair of spiked knuckledusters.

On the other team, Jaune refused to take anything but a sidearm, and Pyrrha ended up taking one of the semi-automatic rifles, slotting a bayonet onto it. Nora immediately stole all of the grenades (which they didn't know if that was a good thing), and she also grabbed a sidearm as well. Ren grabbed a pair of sidearms, and after a bit of negotiation, he also took a pair of combat knives.

They all slid into their combat armor, making sure that the armor was secured, then made for the transport shuttle. As the shuttle took off, Yang turned to her sister.

"Come on Ruby, we'll be done before you know it." she said, patting Ruby on the shoulder.

Ruby said nothing for a long while, before turning to her sister. "I'm just worried. I mean, what if the pink monsters aren't the only type of monster?" she said, worry on her face.

Yang patted her sister a few times. "Don't worry about that. If there are, we'll just shoot 'em down."

Ruby smiled, and wrapped an arm around her sister. They felt ready to face whatever was ahead of them.

Oh boy, they were in for one Hell of a ride.


Hey, me again. So this is my first fanfiction, and I would love any criticism you can give me. And, while I may not have a clear update schedule, I'll try to update this as often as I can.

I drew inspiration from a few of my favorite fanfics, including The DOOM Chronicles, Knee Deep in the Dust, and Remnant Infernis: Doom.

Read and Review.