All of the Crimson Demons cast their best spells on Sylvia, but not a single one of them did ay damage! 

(Y/N): She really is immune to magic now! Crap! 

Sylvia: It's time to admit that resistance is futile! I thought you Crimson Demon Clan people were supposed to be smarter than this! 

(Y/N): Alright, let's go! 

Soon... 

You, Team RWBY, Kazuma, and Aqua returned to the facility. 

(Y/N): There's got to be something around here. 

Ruby: Hey, I found this! 

She found something that looked like- 

(Y/N): THE GAMEBOY?! 

Yes, it looked like the Gameboy that started you guys going on adventures! 

Blake: What's this doing here? 

Kazuma: What's up with such an outdated piece of tech doing here? 

Then Kazuma noticed a bunch of old video game systems. 

Kazuma: Why are these here? 

(Y/N): Hmm ... 

Blake then noticed a diary. 

Blake: Let's see. "They don't seem to know what I've made here. If they knew I spent the country's research budget making video games and toys, it'd be my head!" Looks like whoever owned this was a scientist and game maker. 

She continued reading. 

Blake" I think I'll make a giant humanoid robot. One that can transform! They told me to be serious. I jut stick a finger up my nose and shot back, 'well then, we'll just make it huge and resistant to magic.' And they bought it! But what to model it on? 

The diary then talked about how the scientist was making the Mage Killer. 

Blake: "It won't work without batters, but maybe someday I can make it part of a chimera and turn it into a living weapon." Well, that's ironic. "I've come up with a new weapon to fight the Demon King. An augmented human. I asked for volunteers to undergo augmentation surgery and got so many applicants I had to pick by lottery. They're practically obsessed with augmented humans here. The surgery will cost them their memories." 

Kazuma: I think I know what's going to happen. 

Weiss: The birth of the Crimson Demons. 

Blake: "The Augmentation surgery is finally done. My subjects said 'aster give us new names.' Who the hell is this matter? I don't want to be bothered so I gave them some random names. They seemed thrilled. But they are strong, really strong. The bigwigs seemed happy at this. Since we were there, I figured I would give a name to these augmented people. Because of the color of their eyes, I called them the Crimson Demon Clan." 

Ruby: WHOA! 

Kazuma: THe Crimson Demons are augmented humans? Actually that explains a lot. 

Aqua: Anything else? 

Blake: Let's see. "The Crimson Demon Clan begged me for a weapon to counter Mage-Killer, which it considers the greatest threat to its existence. I mean it doesn't even work. I didn't build it to threaten them, and it has no batteries. Well, I built them a weapon. I wasn't going to think too hard, but I got a little too into It, and it really turned into something! It doesn't use electromagnetic acceleration, but I can't come up with a good name, so I'm going to call it the Railgun! 

Ruby: (excited) RAILGUN!? EEEEEEEE! 

Kazuma: And now Ruby's excited. 

Blake: Hmm ... "My railgun is awesome. It actually might be able to destroy the Mage Killer. I planned a simple weapon that used compressed magic, but when I let the Crimson Demons fire off a shot, I was shocked by how destructive it was. It probably won't have power like that for long. I jut kind of threw it together from whatever pieces I could find. It'll probably fall apart after a few shots. I wouldn't want it to fall into the wrong hands, though. Actually, the length is almost exactly right for a drying pole. But I'm really screed now. Everyone is riding high because the Crimson Demon Clan Plan worked so well, and now the Brass want to use their massive national budget to build a super-sized mobile weapon! Oh well, not like it has anything to do with me!" 

(Y/N): Hmm ... wait ... drying pole. 

You then recollected your thoughts and- 

(Y/N): QUICKLY! FOLLOW ME! I HAVE AN IDEA! 

Back with the Crimson Demons... 

Crimson Demon: We're going to run out of magic! 

Crimson Demon 2: We won't be able to teleport away from Sylvia's attacks either! 

Sylvia: Now to turn you into- 

Yunyun: STOP RIGHT THERE! 

Yunyun appeared. 

Megumin: YUNYUN WHAT ARE YOU- 

(Y/N): HEY WE GOT IT! 

You gave the Railgun to Ruby! 

Ruby: OH MY GOSH! THANK YOU (Y/N)! 

Megumin: Is that the weapon? 

(Y/N): Yep! Sure i- Huh? 

Komekko: HI! 

Weiss: Why is Komekko here? 

Megumin: I told her to go to the evacuation center in an emergency, but she slept right through the alarms. 

Yang: Why is Yunyun up there? 

Darkness: Uh ... 

Yang: DARKNESS, WHAT DID YOU DO?! 

Darkness: I ... baited her at first, but then she said she didn't want to fight someone who was all defense and no attack. 

Weiss: That makes sense. 

Yunyun: SYLVIA! I AM YUNYUN, ARCH-WIZARD AND WEILDER OF ADVANCED MAGIC! FIRST AMONG THE PLLCASTERS OF THE CRIMSON DEMON CLAN, AND THE ONE WHO WILL ONE DAY BE CHIEF OF THIS VILLAGE! AS DAUGHTER OF THE CHIEF OF THE CRIMSON DEMON CLAN, I SHALL SHOW YOU THE FORBIDDEN SPELL PASSED DOWN ONLY TO THOSE DESTINED TO LEAD OUR CLAN! 

Crimson Demon: YEAH! YUNYUN'S AWEAKENED! 

Crimson Demon 2: SO COOL! YUNYUN, YOU ARE SO COOL! 

Ruby: AWWW! Yunyun is getting some appreciation! 

Kazuma: If anything the locals are eating it up. 

Sylvia: Ha! What's wrong little girl? Secret techniques and killer moves, the rest of your kind are all talk! What about you? Will I really see this forbidden spell of yours? 

Yunyun: Yes, my technique is- 

She turned around and- 

Yunyun: RUN FOR MY LIFE! 

Kazuma: WHAT?! 

Weiss: She finally snapped. 

(Y/N): NO! IT'S PART OF HER PLAN! She's got to be doing the same thing as Joseph! 

Sylvia: COME BACK HERE! 

Sylvia chased after her, and cornered her. 

Sylvia: What now? 

Suddenly she was teleported away. 

Sylvia: WHAT?! AAAAAAAAAAAAARGH! WORLD'S STRONGEST WIZARDS MY ASS! YOU'RE JUST A BUNCH OF GUTLESS BIG MOUTHS! 

Ruby: I GOT YOU NOW! 

Aqua: Wait! SACRED EXORCISM! 

Aqua charged up the railgun! 

(Y/N): Okay, you ready Ruby? 

Ruby: I got this! 

She got into position. 

Ruby: One shot, one kill. 

But as she pressed the trigger, nothing happened. 

(Y/N): HUH?! 

Sylvia then appeared. 

Sylvia: Hello. 

Everyone: AAAAAAAAAAAAAAAAAAAAAAAAGH! 

You all ran for it! 

Sylvia: YOU CAN'T RUN FOREVER! COWARDS OF THE CRIMSON DEMON CLAN! YOU AND EVERYONE YOU LOVE SHALL NOW LIVE IN FEAR, NEVER KNOWING WHEN YOU'LL BE ATTACKED! 

Komekko: HEY! MY SISTER IS NOT A COWARD! SHE EVEN TOOK OUT THE DARK GOD! 

Megumin: Komekko. Hmph. Sylvia, I can't overlook what you said. This fight is between you and the Crimson Demons. If we give you the weapon that Ruby used, will you let them go? 

Sylvia: Another of (Y/N)'s flunkies? I don't think I've seen you do anything. What's your ability? 

Megumin: (Y/N), take care of Komekko for me. 

(Y/N): Huh? Megumin what are you- 

Megumin: I'm going to go and blow Sylvia away with my special technique. 

(Y/N): What are you saying Megumin? 

Sylvia: Let me guess, duck and dodge until you run away with your tail between your legs? 

Megumin: BLACKER THAN BLACK, DARKER THAN DARK, IN ABSOLUTE DARKNESS, MY POWERS SEEK DESTRUCTION! 

She began to generate so much magic! 

Sylvia: WHAT?! WHAT IS THIS?! WHATEVER I DON't CARE WHAT YOU DO, I HAVE MAGE KILLER AND- 

Megumin: EXPLOSION! 

And then she collapsed. 

Eveyrone: Huh? 

Sylvia: AAAAAAAAAAAAAAAAAARGH! FUCK YOU ALL TO HELL! THAT WAS ANOTHER ONE OF YOUR STUPID BLUFFS?! YOU'LL PAY FOR SPOOKING ME LIKE THAT YOU BRAT! I'LL RIP YOU APART LIMB FROM LIMB! 

Komekko: Uh, why is it flashing? 

Ruby then saw that the Railgun was flashing. 

Ruby: It didn't have enough ower for a single shot! 

Ruby grabbed it. 

Ruby: HEY! SYLVIA! 

Sylvia: OH WHAT NOW?! 

Ruby: SYLVIA! YOU SHOULD KNOW THAT I AM THE RIGHT-HAND WOMAN OF THE LEGENDARY HERO (Y/N) (L/N)! I AM THE SCYTHE WIELDER, THE SNIPER, THE SWORDSMAN, AND NOW RAILGUN MASTER, RUBY ROSE! 

And then Ruby pressed the trigger! 

And a massive laser fired out and- 

Sylvia: Wh-What? This is ... the end ... for ... me? 

Ruby then did a pose of the Crimson Demon Clan! 

Ruby: HA! HOW DO YOU LIKE THAT?! 

(Y/N): WAY TO GO RUBY! 

Yang: THAT'S MY LITTLE SISTER FOR YOU! 

Megumin: She ... actually ... killed one of the Demon King's Generals. 

Ruby: And- 

She stored the Railgun with her. 

Ruby: I'm keeping this baby!