Core stood across from John, or whatever he was now. The energy that came from him was enough to rip clean though the barriers into other reflections. The sky darkened with the foul, raw Void energy. It was as if Nature itself was scared of it. Winds blew with hurricane speeds and as black lightning tore the sky apart. As for Core himself, he stared at John, and felt something, something that was lost to him for countless years. Fear. “Heh...heheh…” Core chuckled. “Gloves off then.” He smirked, taking off his mask and tossing it to the side, summoning two black Fenrir’s.

John stood there. Swaying a little. His form completely different from before. Most of it was black as Void. His eyes were white. No, not white. More like a mass of rage and raw power. He had ethereal like horns that curved from the back of his head like ram horns but demonic, and two large wings attach to his back.

In an instant he vanished. Core’s eyes widened they turned around quickly to try and block. Only for him to double over as a fist buried itself deep into his gut. He felt pain. Then he was hit with an uppercut that sent him flying with the force shattering the ground they were on like glass.

Got up quickly, and rapidly cast high level spells infused with darkness at John, who dodged or blocked most of them. The few that did hit, felt like raindrops on his skin.

John flew at incredible speeds catching up to Core in less than half a second. John grabbed one of Core black Fenrir's and broke it in his clawed hand like a twig. Then slugged Core to the other side of the planet catching up to him quickly.

Core landed in a crater making it ten times larger from his impact. He looked to his left and saw the being from before.

“I would recommend you stop playing around if you want to live.” It said smugly with a big smirk.“Well excuse me to your slaughter. This world is about to get some guest soon. Interesting ones at that. Especially six of them.” It then disappeared with John appearing soon.

Core hacked out a large chunk of black blood, it burning the ground it touched as he got back up. “So the rest are coming. Might have to speed up some things.” He muttered, snapping his fingers and sending a message via darkness to his followers. “Brother went all out when he made these people. Two can play at that game.”

John just growled then threw a punch which entered a portal of some kind. Next thing Core knew he was hit from behind. He growled and grabbed the fist. Then sent a wave of Darkness that sent John flying. John just stopped mid air and watched Core while swaying a bit.

Core looked up at John, and placed a hand over the pure darkness where his heart should be. “Unlock, Reaver.” A large aura of darkness appeared around Core’s body began to change. His skin peeled off, and what remained looked mummified, and ancient. His limbs grew longer, his jaw split into two, as four more pairs of eyes appeared on his face. Core’s robes changed, becoming a grey, dusty, ragged cloak. A hole was over where his heart would be, and there glowed a black orb, with three more locks on it. Core raised his hand, a scythe made of Keychains appearing. “Moonlight Cemetery.” Core spoke, dark magic flowing into the ground as Skeletons of all types of races rose from the earth, each wielding rusted, decaying Keyblades.

John let out a loud roar as he created dozens of Void orbs and sent them at Core and his troops. The orbs destroyed a good bit of them with Core deflecting the ones at him away. He then had to block as John smashed a giant blade of Void on him destroying the ground beneath him.

While the army of undead dealt with the earth under them falling apart, Core vanished, reappearing behind John, who met his attack and the two locked blades. “What lengths will you go to, to end me?” Core asked, his voice deeper, hollow, and rhaspy.

John just roared and created a huge arm of void on his back which grabbed Core and threw him across the sky. He corrected himself quickly but had to dodge a massive blast of Void. He turned and saw John coming in quick.

Core summoned another Scythe, this one being made of twisted, decayed Keyblades. “Hollow Ends.” He said, using both Scythes and casting a spell that flooded the air and putrefied it with darkness. While John was unaffected...those in the settlement below...were choking with each breath. “Save them, or end me? Decisions decisions.”

John suddenly disappeared into a portal. The next thing Core knew John slugged him to his right before disappearing into another portal. John repeated this multiple times till Core saw a small pattern then dodge John coming from behind. He then hit him with both Scythes sending him into a mountain. Which became a crater from the impact.

Core once again placed a hand over his “heart”, the dark, locked orb. “Unlock. Litch.” Core’s body once again began to change. His Scythes disbanding as his body shed all it’s rotten flesh, his now bony body being wrapped in black cloth, covered with a cloak weaved from various hides. Core now stood at fifteen feet, all skeletal, his eye sockets glowing yellow as a staff of bones and Keychains appeared in his hand. “Lifeless.” He said, waving his staff as the moon above began to corrode, a large chunk of it vanishing into a silver gas that Core drank like wine. A boost in power surged through him, while this world’s Luna...Screamed in agony. “Tick. Tock.” Core mocked as John was approaching.

John then surrounded himself in Void which broke off. His skin looking shinier. He then Blinked behind Core and smashed him with two huge Void arms off his back into the ground before sending hundreds of Void blast into the crater.

John then landed in the crater a dozen feet from Core. Swaying his body in a mindless fashion. Core got up and dusted himself. Not admitting that the attack had hurt. He saw the way John was acting and realised that John wasn't there.

“So, is the demon at least there or is the Void itself controlling the body?” Core asked, his voice deeper than before.

John grabbed his head and started shaking. He then let out a loud roar as an explosion of Void surrounded him increasing his power. He then launched himself at Core grabbing him by his head and practically digging a trench with his face.

“Void it is.” Core muttered. He grabbed John’s wrist and managed to twist it off him, and teleported back into the sky. He then summoned a dark lightning bolt in his hand, and shot it at John, who took the full impact. He was harmed by it, but not enough to stop him. When the attack was over, John was emitting smoke..

John looked up and then summoned four void arms. Two at his upper back and two at his lower back. He put the arms in front of him and started gathering massive amount of Void. Once the blast was larger then him he condensed it to the size of a basketball. He then launched it right at Core. He realized quickly if he didn't dodge that blast will hurt a lot.

Core managed to dodge, though part of his leg was taken from the blast. “Huh. Still want more?” Core placed a hand over his orb of Darkness. “Unlock. Black Knight.” Core spoke, his body began to shrink to slightly taller than his normal heightheight, his apparel changing into a jet black set of armor covering his whole body. In his hand he summoned a greatsword version of Soul Eater, only the eyeball was replaced with a heart. The Soul Eater Greatsword was over twenty feet long, and Core wielded it with one hand. “How much further?” Core said, his voice normal again, and was waiting for John to make the first move.

John practically teleported a dozen feet from him. Before dividing himself into ten John's. It's power not dropping at all. Each then creating Massive Void swords in both hands about fifteen feet long.

Each John then went straight for Core ready to kill him.

Core spun, infusing darkness and void into his blade. When it made contact with the Johns, they were defeated, save for the original, who took the hit and was sent flying into what was Canterlot Mountain, now crumbled by the impact.

John got up slowly from the crater. With a huge cut across his chest. He looked at Core...and charged straight at him. He was impaled by Soul Eater, but it didn't stop him. He impaled himself further till he was right up in Core face. He grabbed him with both his arms before creating six Void arms. Which started surrounding them with tons of Void. Core saw what it was trying to do. It was trying to create a much bigger blast from before and then detonate it point blank. He didn't have long before it goes off.

Before he could move John suddenly started taking them up. Before he knew it they were off the planet. He had to do something or this won't end well.

Core placed his hand over his darkness...for the last time. “Fine then. Your funeral.” Core said, letting go of a shaky breath. “Unlock...Sin.” Core’s body convoluted, twisted and snapped. He fell to the ground, screaming. Pain surging through him as he fell back onto the planet. When he hit the world, it was a ball or darkness cocooning what was within. When the darkness began to fade, what was left was...a child. Ash skin, black eyes, with grey hair. His clothes were a purple hoodie and shorts, black shoes. “Now then, where are you?” Core said, his voice like a twisted child’s.

John appeared before Core looking at him. He was still swaying to and fro. Looking at Core like he was nothing. He still had both wounds from Soul Eater on him. John suddenly slugged Core shattering the ground, but Core didn't even budge. "I warned you.” Core grabbed John’s wrist, and pulled off his arm with ease. He did the same to the other, John’s legs, and when John was just a roaring beast without limbs, he began punching John, each hit physically knocking the void energy out of John and into the air. “I had plans for you.” Core punched. “And that demon would have been gone.” He punched. “But you made me unlock their powers.” He punched John again, harder, a wave of darkness and void was sent out as John was normal now, clothes ragged. “But all of them. Reaver, Litch, Black Knight, and now Sin. Each one I beat and captured their essence, I only had one time to use their powers and here you are, letting them out back into the worlds now that I’ve used them up.”

Core sent one more punch sending John flying before letting him crash down. Core figured he was dead so he turned around to walk away.

“...Void…”

Core’s eyes widened when he heard John. He quickly turned around...to see two eye of something he has never seen. It wasn't the demons or John's. It was John's body, but… he didn't know what this was.

“ ...Extinction….”

It then hit Core in his chest...pain, no this was something else. Like it was trying to erase him. He felt his being starting to disappear. He had to act fast! Whatever this was it'll kill him. He had one trump card, but he won’t last long after using it. Core reached into his pure darkness, and funneled it outward. A wave of Darkness shot outwards, raising the ground and splitting the skies above. When the smoke settled, Core and John were laying in a crater.

John was knocked out. He was also in critical condition. Core wasn't any better really. He had a massive burn mark from whatever that attack was. He was back in his base form and has lost a lot of power in this fight. He got up and looked at John. Still wondering what just happened. “Just what are you? John Corvo.”

He sensed others near by and looked up. He saw his followers as well as Zeke and the others he allied with.

“Well, something might come out of this yet.”

Author's Notes:

Hey guys. This is part one of the mass. It's the battle. Want to know what happened to the mystery settlement? Read "Life of a Nobody" by Xinrick. Other stories will crossover with this one in my next chapter.
Also if your wondering more about John's form. Picture Asura's rage form with Gargos' wings and horns while having John's head.
Well. Later guys. Let me know what you think down in the comments. Seriously. I've got like fifteen comments all together from this story I think XD