Disclaimer: I don't own RWBY which is owned by Rooster Teeth. I also don't own Doom which is owned by ID Software.
Ozpin is in his office at Beacon Academy. He was drinking his hot chocolate.
Then Glynda Goodwitch showed up after arriving via the elevator.
"Hello Glynda," Ozpin said as Glynda looked rather serious. "What is wrong?"
"The Grimm presence at Mt Glenn has suddenly lowered," Ozpin's second in command said.
"Oh? How could this have happened?" Ozpin said.
"I do not know," Glynda said.
"It could possibly mean they might have moved somewhere else…" Ozpin said.
"No one saw any movement. Unless they went through an underground tunnel, then something must have destroyed them," Glynda said. "But that's the thing…who could have annihilated the Grimm?"
'It could possibly be a silver eye warrior…' Ozpin thought, but they have been very rare these days, and he knows that Ruby was at the cafeteria, right now. So it means that an unknown third party killed them all. He had to look into this.
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-Meanwhile-
BGM: Mick Gordon - 11. BFG Division
The Slayer then set on fire a group of Creeps and Imps and then blood punched them all as they were torn asunder.
Then a Doom Hunter arrived along with a Beowulf pack. The Grimm charged against the Slayer, who decided to pull out another one of his deadliest weapons, the Unmaykr.
The Slayer proceeded to fire the gun which fired 3 streams of projectiles at the Beowulfs which were instantly turned into black disintegrating Swiss cheese. The Doom Hunter fired fireballs and the two guns on its sled fired projectiles at the Slayer who simply dashed to the side and fired his dangerous weapon.
The Unmaykr easily shredded through the Super Heavy's shield and proceeded to damage its torso. The Slayer then fired at its sled which was heavily damaged.
"Critical damage," the Doom Hunter said as it abandoned its sled though it was killed before it could do anything.
The Slayer then ended up meeting a Marauder, and a special Beast-Master Marauder.
The Beast-Master looks like a normal Marauder but has a wolf-shaped pauldron, wolf mask, and wields two small argent axes.
"You will pay for killing the Khan Maykr! You false idol!" The Marauder said as he fired his super shotgun at the Slayer who actually took damage. The Beast-Master Marauder began to summon two Hellhounds which began to run at the Slayer. Seeing that he was about to be attacked by the enemies he ends up shooting the dogs with his Super Shotgun.
The Marauder tried to swing at the Slayer with his ax but the bane of demons fired his Super Shotgun point-blank rage, and then fired his Ballista which also did damage to the Super Heavy demon as he was stunned.
The Beast-Master Marauder summoned more wolves as some Possessed Soldiers arrived with a group of Ursas.
The Doom Slayer then used the Meathook to grapple on over to a Possessed Soldier which proceeded to burn the Demon and he fired his gun up close to the demon. Then he used his Doom Blade to slice apart a Possessed Soldier and decapitate an Ursa.
The Beast-Master Marauder's wolves managed to do some biting damage to the Slayer which made him pissed. The Marauder tried to attack the Slayer but he ended up firing his Super Shotgun up close to the demon and then fired two grenades from his Equipment Launcher which actually also killed some unfortunate Possessed soldiers caught in the explosions.
The grenades detonated which did a lot of damage to the Demon. The Slayer then rushed on forward and tried to fire his Gauss cannon at the Beast-Master Marauder but he pulled up his shield which blocked the attack.
The Marauder, whose shield was still down from the damage, also tried to punch the Slayer but he ends up catching the fist with the Doomblade on it which then extended and pierced his head.
"Nnnnoooooo!" The BeastMaster Marauder said as he was pissed and rushed onward to and tried to do a downward slash with his twin axes. However, the Slayer fired the Super Shotgun with the Meathook and his other Super Shotgun that he took from the dead Marauder, which finally turned his face into nothing but brain manner and skull fragments.
The Slayer was then dog piled on by some Ursas but then he managed to get them off him by overpowering them with his unparalleled strength. He then took them out by firing two with a Precision Bolt from his Heavy Cannon, punching two's face-off, and fired the Ballista at the face of the last Ursa.
The remaining Possessed Soldiers decided to try and run away out of fear from the Slayer but then he killed them all with the Micromissiles of the Heavy Cannon.
The Slayer's armor was looking damaged with the bites from the dogs. Though he didn't seem too concerned with this fact.
Then several Grimm, which included Boarbatusks, Griffons, Beringels, Beowulfs, and a King Taijitu, arrived. The Slayer simply pulled out his BFG which he then fired, burning up many with its strands of green lightning. The King Taijitu was then hit by the projectile of the BFG which hit it in the middle. It took heavy damage by the strands of green damage.
The Slayer then just finished it off with his Heavy Cannon's micro missile mod which reduced the Grimm into bloodless pieces.
BGM End.
The Grimm presence near Vale plummeted rapidly though he was now eventually near Vale, having ripped a hole in the Grimm on the way.
"Ah yes, Vale. The place where the King of Vale rules in secret. Though a lot of corruption has crept up and has yet to be dealt with, even by the Huntsmen," Samuel Hayden said as the Slayer nodded. "Now then. There is someone we should meet…at one Beacon Academy…"
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-Several Minutes Later-
The Doom Slayer arrives at Beacon Academy.
Everyone stayed far away from him.
The other huntsmen, including Cardin's team, were very curious about the Slayer.
Cardin approached.
"And who are you?" Cardin said as he was curious about him.
The Doom Slayer was silent, not bothering with this one.
"Can you speak?" Cardin said.
The Slayer said nothing.
"I don't know if he can't or not…" Sky said as he shrugged.
"Me either," Russel said.
"Are you a huntsman?" Cardin said.
The Slayer has no response whatsoever. He just went on his way.
"Well, that didn't go anywhere…." Cardin said.
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-Meanwhile-
Team RWBY is going to go to Lunch. Enjoying their favorite food.
"These cookies are nice!" Ruby said.
Blake was scarfing some tuna fish down.
Yang and Weiss didn't seem to want to eat, preferring to talk instead.
"So have you heard about there being a decrease of Grimm nearby to Mountain Glenn?" Yang said.
"I heard about it. What do you think it could be?" Weiss said.
"They're a badass," Yang said. "I bet it's my uncle!"
"Your uncle?" Weiss asked.
"Yep!" Yang said.
Then Team JNPR arrived.
"Oh hey, Weiss," Jaune said.
"And hello to you too. Why are you even here?" Weiss said.
"Haven't you heard? There's this large green man at the Academy!" Nora said.
"A large green man?" Ruby asked. She thought of a huge green-skinned man, something along the lines of what you readers would compare to Shrek or Hulk.
"Well to be fair he was wearing armor," Ren said.
"He also seems to look very strong," Pyrrha said.
"A green armor?" Ruby said.
"How curious," Weiss said.
'Please don't have a crush. Please don't have a crush. Please don't have a crush,' Jaune thought.
Back with the Slayer, he didn't care about what people thought of him as he was busy making his way through Beacon Academy.
"Ah yes. These people are to become the future huntsmen to deal with the Grimm though none of them will be able to deal with the corruption plaguing the last vestiges of humanity on this world," Samuel Hayden said. "But I do know that later on, they will grow the skills to battle the Grimm menace."
The Slayer glanced around briefly.
"Of course, that will change now that you are here," Samuel Hayden said as the Doom Slayer cracks his knuckles. "But I digress. We are close to the one who leads this academy. He is important to what will come next."
A/n: So here we go. The appearances of the students of Beacon Academy alongside the other important characters in RWBY. So let us see what will happen next in this wonderful story of mine about Doom and RWBY, shall we?