5 Minutes Earlier; Downtown Los Santos, San Andreas; October 11, 2018; 9:35 PM*

Rarity stood in a small section of the building that overlooked the rest of the city, absolutely terrified at the scene before her.

'My friends... They're all fighting that ruffian Arabus..' Rarity thought in horror as she saw the view past the mountains bathed in various-colored lights.

"Infuriating, isn't it? The fact that your friends are fighting this monster, how quickly they cast you aside.." a voice said behind her.

Rarity turned around quickly.

"Who's there?!" Rarity wondered aloud.

"Even a human was deemed strong enough to handle this monster. Not you, not another pony, not a huntress or Adenienite, just a plain, simple human. I know it angers you, Rarity." the voice said again.

"H-How do you know my name?!" Rarity asked nervously.

"I've been watching you, quite intently as a matter of fact. And I know being held back for something menial like this is infuriating, especially since all of your friends are dying as we speak." the voice mocked her.

"Whatever they're encountering, I know they can handle it!" Rarity shouted at the monster.

"Oh, is that so? Have you any clue what they are fighting against, Miss Rarity? Arabus is not your typical villain. It has no morals holding it back from slaughter. No conscience, no fear. But unlimited, raw power. It took an Alicorn, his army, and innumerable alchemists to finally seal it away. That is, until right now." The voice revealed itself.

Rarity almost couldn't see who she was talking to, but it had the faint outline of a pony.

"Y-You're the Pony of Shadows!" Rarity realized.

"That's right. A bit of Nightmare Moon's lost energy manifested as a spirit. I saw you in my Castle several moons ago, Miss Rarity, and I knew then how important you would be. I was going to use you to enact my vengeance against the Princesses, but there are more urgent matters now." The Pony of Shadows informed her.

"Then why should I trust you?" Rarity asked.

"Oh, I'm sorry. I was given to believe you were the Element of Generosity. Think of it this way, if you join with me, You will supply me with a new host, and you will be able to save at least some of your friends. That in of itself is an act of generosity, plus you will finally gain the recognition you rightfully deserve. Doesn't that sound fair to you?" The Pony of Shadows asked her.

"I-I suppose so.." Rarity stuttered nervously. This deal sounded way too good to be true.

The Pony of Shadows turned her attention to the horizon, where a glowing red-violet light shone in the distance.

"Do you know the source of this power, Miss Rarity?"

"Is that... Alexander..?" Rarity squinted.

"If you join me, your power will surpass his in strength. Together, perhaps we may end Arabus's existence forever." The Pony of Shadows continued.

Rarity weighed the options. Respect, living up to her title, and saving the lives of all of her friends.. Was it worth it?

"Do you know if any of them are dead?" Rarity asked.

"Two of the ponies you call your friends are now dead. I believe their names were Applejack and Rainbow Dash." The Shadow Pony answered.

"Rainbow and Applejack?!" Rarity asked tearfully.

"There will be time to grieve later. For now, we can avenge them as one." the pony placed a hoof on her shoulder. It felt cold and misty.

"I accept.. Just... Promise me you're right about this.." Rarity winced.

"You are a mare of business, are you not? A promise is about as plausible as Pinkamena's sanity." The shadow grinned, absorbing itself into Rarity through her horn...

*Former Fall Knight Hideout*

"So, you mean to tell me that this is..?" Weiss asked doubtfully.

"Rarity!" Twilight hugged the alicorn.

"Twilight, stand back!" Nightmare Rarity warned as Arabus attacked again.

"H-How is a pony able to hold off a monster like that?!" Ultimus asked in disbelief.

"I SAID STAY BACK!!" Nightmare Rarity yelled, the soundwave from her scream able to knock down everyone.

Ruby staggered up, in total disbelief over what she was seeing.

"Yang, we're still going after Arabus." Alex ordered.

"Got your back!" Yang grinned, reloading her gauntlet and mechanical arm.

"I'm going too. Just make sure you don't pull a stunt like that again!" Cade demanded.

"I'm not sure how else we can take down something like Arabus." Alex told Cade.

Cade transformed within seconds, glaring at his father with glowing purplish-white eyes.

"You have three Enlightened Warriors, including yourself, and whatever the hell this 'Nightmare Rarity' is. Don't tell me we can't stop this monster." Cade retorted.

"Make that four. I'm not letting anyone kill Saigo besides me!" Ultimus roared as he powered up to his Corrupted Warrior form.

"Especially not that monster!" Ultimus threatened.

"Fine, but let's keep it short. I have a 5 year old at home and I've been gone long enough as it is." Neo's eyes glowed orange as she spoke, indicating her alliance.

"We need some way to defeat Arabus. If I'm right, that means I'm probably the key to defeating it." Twilight added.

"Twilight!" A yell to their behind indicated someone else's presence.

Pinkie Pie, Fluttershy, Celestia, and Luna stepped behind them, well. In Pinkie's case, bounced.

"You're all here..!" Twilight gasped.

"Twilight, this Arabus monster is too much for you, any of you, to face alone." Celestia told her.

"WE HAVE FACED HIS CREATOR BEFORE, HIS SPAWN SHAN'T BE MUCH DIFFERENT!" Luna said in her royal Canterlot voice..

"I have a plan!" Kat yelled.

"Thank god! What's the idea?" Alex inquired.

"The ponies need to stay behind here! That means we need Rarity. Everyone who can fight Arabus has to get Rarity to use her element, even if she merged with a nightmare! The rest are support gunners!" Kat told them.

"It's so crazy, it just might work. MOVE OUT!!" Alex ordered as the 4 Enlightened Warriors and Fall Maiden took to the skies to get Rarity back and fight off the monster Arabus.

*Above Sandy Shores Airport*

Nightmare Rarity and Arabus charged each other at full power, their magic attacks exploding or falling to the ground and destroying most of whatever was below them.

"Ah, it's all clear to me now... The souls I absorbed... They left and merged with you." Arabus noted.

"Not that it would matter to a monster like you!" Nightmare Rarity retorted.

"I thought so... Prepare to die!" Arabus smiled wickedly, charging a powerful dark-magic attack.

"MINE MINE MINE MINE MINE MINE..!" a voice shouted in the distance.

"Have at thee, monste- wait, what is that?" Nightmare Rarity turned around, searching for he source of the noise.

"MINE MINE MINE MINE MINE!!" the voice got closer and closer as the seconds ticked along.

"That sounds like..." Arabus noted as Alex side-kicked Nightmare Rarity in the neck, kicking her into the mountain range nearby.

"LEARN TO SHARE, BRAT!!" Arabus yelled, preparing to fire a magic attack directly at Alex.

Yang and Cade punched either side of the monster before the attack could even fire.

Alex smiled wickedly at the monster, laughing slightly.

"I don't care if you are some legendary warrior spirit. You're still going to die. By my hands, or theirs, you lost." Alex's cocky smile turned into an angry scowl.

"DIE MONSTER!!!" Ultimus fired a massive electric attack at Arabus while Neo slashed the monster before finishing it off with an energy blast.

Arabus smiled condescendingly at them.

"Are you forgetting already what I told you? You're done for! I'll eliminate you all in an instant, just like those two ponies!" Arabus roared.

Nightmare Rarity flew back, firing a myriad of magic attacks, buying the rest enough time to charge their attacks and hold the monster at bay.

"Listen, Rarity. Celestia and Luna are there with the other elements of Harmony, you can stop all of this now and help them. It's our best shot at taking care of this thing." Alex said, turning to the Alicorn.

"The Elements of Harmony will not be enough to destroy Arabus. Besides, the honor can only be left to me." Nightmare Rarity scowled.

"No. You're not seriously doing this right now." Alex groaned inwardly.

"And what if I am?" Nightmare Rarity scoffed.

"God dammit! Just go back there and do the thing!!" Alex yelled.

"DESTINY HAS RESERVED THE HONOR OF DESTROYING THE MONSTER TO ME!" Rarity screamed.

"Fine. I'll take you there myself." Alex scowled at her irrational behavior.

"Oh, what can you do?" Nightmare Rarity asked condescendingly as Alex chopped the base of the Rarity's neck.

"That. I can do that." Alex huffed as he roundhouse kicked Nightmare Rarity back in the general direction of the hideout.

"Fall back! Lead him to the lookout!" Alex yelled as he attacked the monster, kicking it towards Mount Chiliad.

The others flew back as quickly as they could to the now-decimated hideout, with a seemingly invincible monster at their backs.

*Meanwhile; Los Santos, San Andreas; October 15, 2018; 9:49 PM*

Liss, Skirmish, and Evan's Squad had loaded up, and now they were awaiting whomever was coming for them.

"Who the hell do you think is after us?" Vanoss wondered.

"I swear to god if it's some more Inquisitor bullshit like last time I'm strangling someone!" Mini groaned.

"Let's face it, we're already this far in the f**king rabbit hole. We're probably going have to deal with dat boi next." Wildcat scoffed.

"Wait, guys! One if the distortions is here!!" Skirmish dove for cover with her spear as the ground shook apart.

Two portals started to appear. One of them poured out hundreds of soldiers in grey and silver-plated masks.

"Surround the distortion! Box them in!" They yelled indistinctly as they swarmed the distortion.

Vanoss and the others waited right with them.

"Call the city's police, tell them to try and set up a perimeter at least 3 or 4 blocks!" A soldier wearing a uniquely detailed mask ordered.

"You! What's the nature of the tip?" The commander demanded of Liss.

"Right now, several Huntresses and Equestrian royalty are fighting a monster called 'Arabus'. We're trying to keep the Fall Knights from getting in their way as we can!" Liss answered.

"Where are they now?" He asked.

"A forest hideaway a half-click north of the nearby Military Airfield." Liss replied.

"See if we can patch in a radio signal to them! We need people on this 'Arabus' informing them of any weaknesses!" The commander yelled to his squad as the second portal shifted and shimmered.

The second portal looked to be on the verge of collapse, but it was still able to produce something.

A large, orange energy attack that decimated most of the Silver Ocelot resistance.

"The f**k just happened?!" Delirious gaped.

"JESUS CHRIST!!" Lui screamed.

A middle-aged woman simply walked out of the portal wearing a simple red-orange dress. Her features were fading and her energy was off the charts, but it was immediately clear who this was. At least, in Liss' case.

"Cannon fodder as always, Silver Ocelot." The woman scowled towards Liss.

"Who the f**k is this?" Moo asked.

"You don't remember me, Brock?" The woman scoffed in mock hurt.

"Wait a second... Oh, shit. Alex is going to be f**kin' pissed." Droidd realized.

"You mean Walker? Oh, he isn't a concern.. Or, at least he wasn't." The woman smiled maniacally, her eyes glowing not only orange, but blue, green, and even purple.

"Is that who I think it is?" Skirmish gaped fearfully.

"Yep." Liss answered.

"And she's stronger in your universe than in ours?"

"Ridiculously."

"Yep, Cade's going to be pissed."

*Meanwhile*

"Wake up, Rarity." Celestia called.

"Come on, get up!" Ruby urged.

"We need your help, wake up!" Twilight added.

Nightmare Rarity slowly opened her eyes to find she was surrounded by her friends.

"H-Huh? W-What happened?" Rarity asked tiredly.

"Arabus needs to be contained, and quickly, so we came in with the other Elements." Celestia answered.

"First of all, we can't contain this monster, it needs to be stopped now. Secondly, how did you even get the Elements? I thought they were in the Tree of Harmony!" Nightmare Rarity yelled.

"Alex and the others have been fighting to get the Elements here. We were all waiting for you." Twilight told her.

"We need to take down that monster before the peace we've all struggled for is gone!" Rarity got in her place with Fluttershy, Pinkie, Twilight, and the princesses.

Somehow, only the Mane 3 were glowing with their Element.

"What..?" Celestia gaped.

"Damn it! You can't use the Elements because you've already shed your connection to them! And Rarity isn't in her right mind!" Weiss groaned outwardly.

"We need three more people who could represent Loyalty, Generosity, and Honesty! Granted, one might be easier to find than the other.." Twilight gasped, horrified

"We still can't imprison Arabus using conventional means.. We might have to do something drastic." Celestia sighed.

"What can we do at this point?! We're going to lose everything we worked for-!" Rarity yelled as a dark bolt of magic pierced her body through her back.

Everyone widened their eyes in horror. Another friend had just died right in front of them..

Rarity struggled to stand, changing back to normal before falling to the ground, coughing and spluttering, before finally breathing her last.

"D-Did she just..?" Blake gasped in horror and disbelief.

Ruby in particular was terrified. A look of horror plastered to her face as she stared at Rarity's remains.

'N-No... Not again... If this keeps up, who's next..? Weiss...? Blake..? Yang?' Ruby thought, terrified

Celestia's eyes widened in horror as she turned towards the city.

"Luna.. Do you..?" Celestia stammered.

"I feel it too..." Luna shuddered in fear.

"Oum dammit, what now?" Weiss gaped.

"Another sinister being's power just appeared in Los Santos.. It's strong enough to kill all of us.." Luna answered.

Ruby couldn't believe it. This could be it.

'No..! As if Arabus wasn't enough.. Now this?! I... I can't do this.. I can't watch anymore..!' Ruby shook, cradling her head in her hands fearfully.

"R-Ruby..?" Blake asked out of worry. Even Ruby was scared. Not even scared at this point, just shell shocked.

'I... I feel something slipping..!' Ruby thought as her eyes flickered a silver color.

"Ruby? Is something wrong?!" Weiss asked.

Ruby's hair started to stand on their ends, with her eyes still flickering silver light.

Her fear quickly evolved into righteous anger. How dare this monster kill her friends! How dare it try to kill all of them! The lives of her teammates, her sister, and her possible brother-in-law were at stake! If only she could help! If only she could do something!!

Then it all just fell away from her.

The silver glow in her eyes eventually spread to her body, and Ruby let out a scream of pure rage.

"ARABUS!!!!" Ruby yelled as her hair brightened several shades from black to silver, her pupils had disappeared, and everything just seemed to have this glow.

Alex had been watching all of this from a distance, along with Yang, Ultimus, everyone! Even Arabus eyed the girl intently.

"R-Ruby..?" Yang asked as she suddenly powered down. Yang's power-up had reached it's limit.

"Crap! I can't fight Arabus now! But maybe..." Yang realized, turning to her sister.

If Alex knew anything about what was happening, it was that Ruby had reached her potential. And now that she had been angered like this, there would be no stopping her.

"Ruby, kill the son of a bitch." Alex ordered.

Author's Notes:

Okay, so I have a number of things to go over.

1. I know what you're all thinking: 'If Cinder died last arc, then why is she back now?'
This is the Cinder from Cade's universe. The one who managed to kill everyone but Cade and Liss as far as you know.

The idea is that there are 4 timelines to the BRS continuity. I'll do a basic run-down now to avoid confusion.

Timeline A is where Alpha originally came from. Alex, being the idiot with well-intentions "discarded" Alpha, who later went to the main universe to get his closure/revenge by killing Alex.

Timeline B is the universe where Cade, Liss, and All-Powerful Cinder came from, where Alex is a slightly less horrible parent, died fighting True Maiden Cinder along with Yang.

Timeline C... Yeah, I'll get into that later. Extra spoiler-y stuff..

And Timeline D is the main continuity.

2. If you read the blacked-out portion, you'll know that I'm going to start using other RWBY OCs. Specifically those belonging to a DeviantART user named Longsean22 and SuperKamek. I put both links in the description.

Anyways, hang in there for Part 3 and please be sure to comment what you liked or didn't like down below!

-The Destoyer

EDIT:
Forget what I said earlier about 'timelines being erased' and crap. It just doesn't work in practice or in theory.