Hey, guys! Sorry about a later than usual update. You'd think that I'd get less busy as summer drags on, but it's still the same ol' busy schedule. *sigh*

Well, I also had a bit of writer's block, not to mention the other distractions at home. I've watched a bit more anime, and I've jumped on the Attack on Titan bandwagon by binge reading the available manga.

On the plus side, RTX 2015 is in a few weeks! I'm really excited for it. I hope that Gunnar is there again this year. I'd like a good pair of gaming glasses.

I don't own RWBY or Sonic. Enjoy!

Egg ARK, Grimm Acquisitions, 8:30 p.m.

The room was filled with the roars of Grimm and gunfire. Sonic's group was surrounded by the black creatures, fighting to stay alive. Sonic rushed towards Metal Sonic, hoping to at least slow down the monsters by removing the leader.

"You're not leaving this place alive, my loathsome copy!" Metal Sonic bellowed as a sword came out of his right arm. His sword met Cobalt Shard in a clash of sparks. His sword was a dark black, as if it was an extension of his arm- because it really was.

Sonic grinned. "Funny. I was gonna say the same thing, but without the 'loathsome copy'." They started exchanging blows, the level of swordplay astounding.

"There's too many of them!" shouted Amy as she bashed a Beowolf with her hammer. For every Grimm they killed, two more took their place. An Ursa roared and swiped at the hedgehog, but she jumped at the last moment, shooting the Grimm with her gun-boots. "Eggman, why did you capture so many Grimm?!"

The evil doctor's head peeked out from behind his pod. "You lot destroyed most of my Dark Pawns in the digital realm! I had to compensate!"

Yang punched an Ursa into a pack of Beowolves, knocking them down. She then whipped her head towards him. "Do you even have any that can fight back?!"

Eggman facepalmed. "Of course I do!" He typed a series of commands into a keyboard on his pod. "Attention all Dark Pawns! Come to Grimm Acquisitions! We require your assistance!"

A few seconds later, the door to the room opened and about fifty Dark Pawns entered. They took aim at the Grimm with their guns and started shooting them. Many Grimm fell to their guns, and it looked like the tide was turning. However, one accidentally fired a rocket into a cage holding a Nevermore, opening it. Freed, the Grimm eyed the Pawns with a malevolent gaze. With a flap of its wings, the robots were skewered by the feathers it launched.

Shadow held back a chuckle. "Looks like your cannon fodder didn't last long." He calmly took aim at the Nevermore with Crimson Dusk and fired. The head of the giant bird disappeared in a cloud of red steam, and it collapsed to the ground, crushing some of the other Grimm.

"Excellent work, Comrade Shadow," said Omega through the sound of his machine guns. "Elimination!" He shifted to his grenade launchers. "Fire! Fire!" He launched a grenade into a cluster of Beowolves, killing them in a fiery explosion.

"You're not so bad yourself, Omega." Shadow looked around. "Wait, where did Nora go?"

Omega was about to answer but was interrupted by a squealing noise. The source was a warthog-like Creature of Grimm. The Boarbatusk stomped its feet at them angrily. It then rolled into a ball and sped towards them like a deranged tire.

"FORE!" The head of a large hammer slammed into the Grimm before it could hit either Shadow or Omega. The Boarbatusk bounced around the room for a bit, slamming into a pack of Beowolves. Nora pumped her fist in victory. "Strike!"

"Are you playing golf or bowling?" asked Yang with a raised eyebrow.

Eggman pointed at a Deathstalker from his shelter. "Who cares?! There's a big one coming!"

Shadow transformed Crimson Dusk into katana mode and grinned evilly. "I like a challenge." He boosted towards the scorpion, yelling fiercely. The Deathstalker snapped its pincers and tried to punch the black hedgehog into a wall. Shadow dodged it and spun his body around, quickly slashing at the claw with his sword. The blade cut through a weak spot in the armor, and the claw fell to the ground.

The Deathstalker, not at all happy about the loss of its claw, roared angrily and grabbed Shadow with the other claw before he hedgehog could notice. It eyed him furiously and stabbed at him with its tail. The Grimm became very surprised when it hit nothing, as Shadow used Chaos Control and teleported away before it hit him.

Shadow reappeared and pulled out his green Chaos Emerald. "You'll have to do better than that to defeat the Ultimate Life Form! CHAOS CONTROL!" For everyone except Shadow, time slowed down considerably. The black hedgehog quickly slashed at the scorpion in its slow state. He then snapped his fingers, and time went back to normal. The Deathstalker, however, collapsed on the ground, dead.

Shadow gave a nod of approval at his handiwork, then rejoined the main battle.

Inside the Egg ARK's computer systems

Aeromi had her work cut out for her. Although she had gotten into the computer system okay, it wouldn't take long for her presence to be noticed. "First things first… Gotta find the data center."

She was currently in a room with the same sort of atmosphere as that in the Digital Realm of Remnant, except for a few small details. The lights were bright orange instead of white, and Eggman's logo was everywhere. "Jeez, talk about a huge ego," Aeromi muttered. She walked towards a large computer monitor.

"Bingo, this ought to tell me what we need to know." The AI typed in a string of commands on the keyboard in front of the monitor. A pedestal appeared beside it, and she placed her ID disc onto it. The disc glowed, indicating the requested information was being transferred from Eggman's systems to her disc. "This shouldn't take too long…"

An alert flashed on the monitor. "Huh?" Aeromi pulled up the alert.

*Anomalous Chaos Energy detected*

"Chaos Energy? Maybe it's a Chaos Emerald…" She typed in a command to show the location of the energy spike.

A map of Remnant was pulled up, and Aeromi was shocked at what she saw. "What? This can't be right… Are Eggman's computer systems as fried as his mind?" She tapped in a command to verify the location of the energy. The computer gave the same result. "Oh boy… I'll be seeing some interesting reactions to this."

She added the coordinates to the data she was downloading, and when it was done, she took her ID disc and quickly made her way back to where she entered.

Grimm Acquisitions

"Ha! I never thought swordfighting with you would be so much fun!" Sonic laughed as he parried yet another blow from Metal Sonic. The battle had gone on for quite a while, and they both lost and gained ground. Sonic was covered with small cuts and bruises, but Metal wasn't exactly pristine, either.

Metal Sonic looked at his organic rival with rage. "Don't be so cocky, Sonic. I'm just getting warmed up!" A white flash enveloped Metal, and all his dents and scratches were repaired instantly.

Sonic looked at him in shock and annoyance. "Aw, come on! That's not fair!"

Metal chuckled evilly and held out both arms. A second sword came out of his left arm, matching the one on his right. "You should know by now from all your battles with my idiot creator that there is no 'fair' on the battlefield. There's just living-" Metal brought his swords into an X-shape in front of him. "-or dying."

The blue hedgehog glared at Metal, then saw Yang just behind the robot. She reloaded her gauntlets, then winked at Sonic. His scowl turned into a smile. "If that's the case, I guess that means I don't have to fight you all by my lonesome."

"What do you-"

Metal's sentence was interrupted as his head was embedded into the ground by an unseen source. Yang had punched Metal Sonic into the floor, her weapon giving her extra power in her punch. "Booyeah!" Yang cheered, Ember Celia smoking slightly. "How'd you like that, you metal freak?!"

Metal Sonic slowly got up, the damaged parts of his head repairing themselves. "You'll have to do a lot better than that…" At an unspoken command, a huge Deathstalker skittered up and punched the girl into a wall with its huge pincers, creating a huge indentation in the wall. "...puny human." A single strand of yellow hair floated down. The Deathstalker watched its descent, as did Sonic. The blue hedgehog gulped. "Hey, Metal? Better revise that statement," he said.

"Why? What can one puny human female do against me?"

As if in retaliation, a yellow fireball jumped out of the wall and hit the Deathstalker, shattering the armor like cheap glass. Another punch in the same place, and the scorpion fell over, dead. Yang looked at Metal, her hair glowing and her purple eyes now red. Sonic edged out of the way, knowing what's about to happen.

Metal faced the enraged girl. "You shattered Deathstalker armor in one punch…" he said, shocked.

Yang slammed her fists together before lunging at Metal. The robotic hedgehog was still dumbstruck that she took down one of the toughest Grimm in the room, and he didn't react as fast as he usually would. She punched him with so much force that it launched him straight through a large piece of machinery.

Sonic walked over next to Yang. "Nice punch," he commented.

Meanwhile, the fight against the other Grimm was winding down. Thanks to the combined efforts of Omega, Nora, Amy, and Shadow, most of the Grimm were now slowly dissolving corpses on the floor. "Well, that was easier than I thought it would be," said Shadow as he reloaded Crimson Dusk. He glanced towards Omega, who was mopping up the last of the Grimm. "Come on, let's see if Faker needs help."

Metal dragged himself out of the wreckage, a piece of pipe wedged into his torso. "I admit, I… underestimated you flesh creatures." He pulled the pipe out, robotic fluid dripping off of it. "I will not make that mistake again." The wound healed again, but it was slower this time, and Sonic caught a glimpse of white in the inner workings of Metal Sonic before the hole closed up.

Yang looked at Sonic. "I saw it, too," she said after reloading Ember Celia. Her expression was serious, bordering on vengeful.

Sonic glanced up at her and grinned. "How about the 'Flying Saw?'" Yang nodded as knelt down, allowing Sonic to get on her hands. She threw Sonic high into the air, and the hedgehog curled into a ball and started spinning rapidly. Yang drew her fist back, and when the timing was just right-

BOOM!

The blonde punched Sonic, shooting him off at tremendous speed towards Metal. He drew his sword out mid-flight, so now he resembled a large saw blade. Sonic sliced cleanly through Metal's arm, and before the robot hedgehog could recover, Amy hit a still spinning Sonic with her hammer, sending him back towards Metal Sonic, slicing his other arm. Then Nora joined in, using her hammer like Amy's. He cut off his legs before being punched by Yang again. Sonic ping-ponged for a while between the four of them, parts from Metal Sonic flying off of him.

After a while, Yang caught Sonic, seeing that they did enough damage to Metal. The robot hedgehog in question was not in great shape. The only recognizable part of him was the head, and only just. The rest of his body was a pile of broken parts and circuitry.

Metal glared at Sonic, his red eyes flickering weakly. "Th-this… isn't… over… Sonic…" He seemed to gain a little strength. "I will… replace you…" His eyes turned black, and the sound of his machinery turning off was heard by everyone.

Metal Sonic was finally defeated.

And thus, Metal Sonic's contribution to this story ends. I liked writing for him, plus I love the whole idea of a third party entering a fight between two bitter enemies.

As for the location of the final Chaos Emerald... *chuckles evilly* I've been waiting for that part since I started writing this. Trust me, it's gonna be great.

Thanks for reading!