Katie looked out the Gummi Ship's window and amazed from what she saw. She nudged Repliku to get his attention. "Look!" She tapped on the window. Outside was a twisting tower with a pointy roof covered with stars. "It's Mysterious Tower!" she squealed.

Repliku rolled his eyes, "Talk about being a little kid…" he snickered.

"Hey!" Katie reached over to Repliku's seat and put him in headlock. "Nobody calls me 'kid' and gets away with it!"

Riku turned around in his seat to look at the two teens and sighed, "Would you two stop it? We're landing and you need to get yourselves in order."

Katie looked over to Riku and made a nervous smile, "Sorry! I'm just excited…" She let go of Repliku and fiddled with her fingers. "Sorry, Riku."

Riku just shook his head with a smirk. How can she possibly be with the darkness? She's too nice. "It's fine. Besides, I have to deal with this guy." He pointed at Sora.

"Hey!" Sora pouted.

"I'm just teasing you, bud." Riku laughed.

Sora's 'angry' face didn't last long. Everyone felt the Gummi Ship jerk downwards, "We're here…sorry for the rough landing." Sora said sheepishly.

After everyone got off, Katie turned to Riku and waited for Sora get out of earshot. "Why the heck did you let him drive?" she whispered.

Riku rubbed the back of his head while saying, "Paper beats rock."

Katie glared at him. "…Really…? And how old are you?"

"It was his idea, not mine."

"Uh-huh."

Katie was basically out of breath when they reached the top of the tower's spiraling staircase. "Why must there be so many steps?" she asked between deep breaths.

Repliku looked at her, "So you can run through the Castle That Never Was for hours but you can't handle a flight of stairs?"

"Hey, I had my inhaler then. I don't have it now. I forgot it back at Merlin's house…I think I left my Epi-pens there too." Katie answered. She watched Sora knock on the large oak door.

"Come in!" said a deep voice inside. Sora opened the door and waited until everyone walked inside.

"Sora! Riku!" shouted a high-pitched voice. Katie knew that voice, it could only be owned by one person. She looked over Riku's shoulder to see King Mickey and Yen Sid with surprise written on their faces. King Mickey noticed Repliku and Katie. "You brought some friends?"

Katie stepped out from behind Riku and made a small bow. "I'm Katelynn Heart. But you can call me Katie." She grabbed Repliku's shoulder and dragged him next to her. "This is Repliku."

Yen Sid was surprised by Repliku's appearance; he looked just like Riku but with longer hair and was a bit younger looking. He bowed his head. "Nice to meet you." He turned his head towards Riku. "What brings them here?"

"Well, Katie here knew that I was a Keyblade Master and I didn't even tell her that I am one. And Repliku looks just like me." Riku looked at Katie, "She can also wield two Keyblades." He added.

"Is that so?" asked Yen Sid, turning his attention to Katie.

Katie nodded her head and held out her hands, with a flash of dark flames, Darkness' Master and Void Gear appeared in her hands. King Mickey's eyes widened at the sight of the two Keyblades and wielded his own, "Don't tell me your one of Xehanort's followers!"

Repliku growled, he summoned Soul Eater and jumped between Katie and King Mickey. "How dare you accuse her for working with that man!" He yelled angrily. "She would rather die than work for him!"

Katie looked at Repliku in a ticked-off manner. "I can take care of myself, thank you!" But Repliku didn't listen to her; he kept glaring at King Mickey with fire in his eyes.

"ENOUGH!" Yen Sid's yell surprised everyone and all their heads turned to him. "Everyone, dismiss your weapons." He looked at Katie. "Except for you."

Katie gulped. 'I'm screwed!' she panicked in her head. She watched King Mickey and Repliku dismiss their weapons; Repliku was still glaring at King Mickey in an evil manner.

Yen Sid looked at Katie. "Come here, show me your weapons." He commanded. Katie nodded her head like an idiot and walked up to his desk, she lifted her Keyblades up to him. Everyone stood in silence while Yen Sid studied the two Keyblades then he studied Katie. Katie shifted uncomfortably, his eyes freaked her out. "It seems you own Keyblades that don't belong to you." He looked at her Keyblades again, "It also seems that you know how to use them quite well. Would you care to explain that to me?"

Katie gulped before answering, "I-I don't know how to use a Keyblade, sir."

Yen Sid raised an eyebrow. "Really? I sense a great power from you; it almost rivals Master Xehanort's."

'That's not good!' Katie grinded her teeth, she felt uncomfortable being in the center of attention. "What do you mean by that?" she asked hesitantly.

"It means you have the power of a Keyblade Master, but you are not one. You hold Void Gear in a strange way, backhanded. It takes major skill to wield a Keyblade in such a manner, let alone wielding two Keyblades without the help of a Drive Form." Yen Sid stood up. "Maybe you should show me you're fighting skill."

Katie could feel her face turn pale. "But I don't know how to use Keyblades!" she protested.

"You say that but your aura tells me otherwise. You will fight Riku."

Katie snickered, "I've fought him before...in a fist-fight. I almost whopped his ass."

Yen Sid smiled, "Then this should be easy for you. Follow me."

Yen Sid took Katie to an open courtyard, which was already preoccupied. From what Katie could see, Kairi and Lea were sparing. They stopped when Yen Sid cleared his throat. It was Lea who replied, "Looks like I got some more competition!" he grinned as he saw Katie. "My name is Lea, got it memorized?"

Katie anime sweat-dropped while saying, "Katie."

"So, is she training with us, boss man?" Lea asked Yen Sid.

Yen Sid shook his head, "She is going to fight with Riku."

Lea's shoulders drooped, "Aw! I've been asking you for months to fight him." He winked at Katie. "But whatever. I'd be afraid of you; I can tell that you can kick someone's butt real hard."

"Thanks…I think…" Katie walked out to the open with Riku behind her.

"Good luck!" Kairi called after them.

Katie turned to Riku when he said, "Don't worry; I'll go easy on you."

"You don't have too." Katie shot back.

"Aren't you going to take that blindfold off? It's a big disadvantage." asked Riku.

"No way in hell I'm going to take this thing off, I can see perfectly." Katie retorted.

Riku shrugged and wielded his Keyblade, Way to Dawn. "Okay…ready?" Katie nodded. "Then let's go." He lunged at Katie.

"Block!" yelled a voice in Katie's head. Katie felt her hand that held Void Gear go up against her will and block Riku's attack. "What the…?" Katie said allowed. "Listen, if you want to win this fight, you have to do what I say." Replied the voice again. "Got it?" Katie mentally nodded her head and heard the voice do a cold laugh. "Good!" Katie felt Darkness' Master slash at Riku's side, making a small cut. "Sorry!" Katie yelped while she watched Riku jump back.

"Don't worry. Just a scratch; didn't even hurt." Riku told her with a smirk. "Blizzard!" A large chuck of ice launched from the tip of his Keyblade.

Katie jumped high into the air, "Fire!" she yelled. A dark fireball launched out of Void Gear and made contact with the Blizzaga spell, melting it on contact. This surprised everyone, even Katie. Katie landed back on her feet and charged at Riku with Darkness' Master crackling with electricity; she swung the Keyblade at his head. Riku blocked the attack with ease. Katie used Void Gear to slash Riku's side, which succeeded. 'Hey! I don't want to hurt him!' Katie protested. "To win a battle, someone must get injured." The voice in her head replied darkly. Katie back flipped away from Riku holding Void Gear in defense and had Darkness' Master ready to attack. "I'm sorry!" Katie cried.

Riku grunted as he held onto his side. "It's okay." He answered, "You're tough." He charged at Katie, but Katie didn't move. He slashed Katie's arm and made her fall backwards. But something was odd; she stopped falling before hitting the ground as if time stopped around her. Confused, he slashed his Keyblade at her. He jumped back when she disappeared out of thin air. "What the-?" He looked around, the double Keyblade wielder was no were in sight.

"Riku! Behind you!" Kairi yelled.

Riku didn't have a chance to turn around; he felt a fireball explode on his back and sent him flying. Katie appeared behind him then disappeared once more. Riku was surprised by her trick. "Hellooo!" Riku heard above his head, he looked up and found Katie defying gravity by hovering above him. "Surprise!" Katie laughed; she threw Darkness' Master at the ground. "Earthquake!" she yelled. Riku felt the earth crack under his feet; in a blink of an eye, high columns of rock and dirt surrounded him. He was trapped. He yelled when he felt a rock spike push him out of the trap, dealing major damage. Katie appeared in front of him and made a foxy grin. She jumped back and grabbed Darkness' Master out the ground; she pointed both of Keyblades at him. She became covered with a dark aura and black orbs formed on the tips of her Keyblades. "Yield!" she yelled. Dark spears shot at Riku faster than bullets.

"Barrier!" Riku yelled. A dark sphere formed around him, blocking the deadly spears. He heard Katie scream and the darkness forming around her burst out of control, her feet lifted off of the ground and larger and deadlier spears of pure darkness shot at Riku. Riku heard a crack from his barrier and before he knew it, his defense shattered. The dark spears pieced forcefully on his skin, so fast and hard that he couldn't lift his Keyblade to block; he was caught in Katie's merciless attack. He fell hard to the floor, wheezing when the attack stopped. He looked up to Katie, now he knew why he sensed darkness come from this girl; she was the Darkness' Gift. Katie looked tired but she charged at him with her Keyblades covered in dark auras. Riku quickly got off the ground and blocked her attack; a powerful shock wave erupted from the two's Keyblades making contact; sending them both flying. Katie stopped in thin air again and disappeared. This time Riku knew where she was going to be; he spun around a launched a powerful Thundaga spell as soon as Katie reappeared. Katie yelled in pain as electricity went through her body. Riku slashed his Keyblade at Katie's sides nonstop, dealing continual damage. He knocked Void Gear out of her hand. He knocked Katie down with one swat of his Keyblade. Katie skidded on the grass. She slowly got up to her feet. "Boy, you just don't give up, don't you?" Riku asked.

"Nope." Katie answered bleakly. "Thunder!" Darkness' Master sent a large bolt of lightning towards Riku; which he defected effortlessly. She disappeared and reappeared in Riku's face. "Boo!" she disappeared again. She quickly reappeared behind Riku and slashed at him with Darkness Master from all directions, making swift movements with the Keyblade. She successfully hit Riku eight-times in a row before stopping. She disappeared and reappeared out of Riku's reach.

"That was a cool move. What's it called?" Riku asked.

Katie picked up Void Gear off of the ground. "Octaslash. A certain one-winged angel uses it; I hope he doesn't mind that I used his trade-mark move." She answered with a smirk. "Want to see it again?" Before Riku could say anything, Katie rushed at him and preformed the move again but with both Keyblades, making it impossible for Riku to block. She sent Riku high up into the air; Katie jumped up and knocked him back down to the ground with just with one swing. Her hand glowed red and shot the red light the ground around Riku, making an odd circle around him with foreign and runic symbols. "Bye-bye!" She raised her hand to the sky and closed it into a fist. As if on cue, lighting hit the ground around Riku and the circle burst into flame, causing a large explosion. Katie lightly landed on her feet and flipped her over grown bangs out of her face to get a good look at Riku. He was lying on the ground, breathing heavily.

Riku lifted his head to look at Katie. "What on earth was that?"

"Apocalypse. Another move from another certain one-winged angel. Sweet move huh?" Katie asked. She dismissed her Keyblades. "Now that's what I call a fight!" commented the voice in her head. 'Thanks.' Katie said mentally. She walked to Riku and held out her hand, "I didn't hurt you too bad, right...?" she asked worriedly.

Riku took her hand and Katie heaved him up to his feet. "I don't think so…" he answered, trying to keep his balance.

"Here, let me help." Katie put his arm behind her neck and wrapped her arm around his torso, helping him stay standing.

"Thanks…you're a great fighter." Riku commented.

Katie smiled, "Why, thank you! To be honest with you, I didn't know what I was doing at all." She confessed sheepishly.

Riku raised an eyebrow, "Is that so?"

Katie nodded. "Yup."

Lea was the first to walk up to her. He whistled, "Man, I'm lucky that wasn't me. You're awesome at fighting. You gotta teach me that move with that red light, man that was awesome!"

Katie laughed, "You can thank Genesis Rhapsodos for teaching me that move!"

Kairi joined them. "Wow, you're strong, Katie!"

"Not to mention 'scary'." Lea added.

"Hey, I was just doing what my mind told me to do. All those dark attacks kinda scared me too. The Darkness scares the living crap out of me." Said Katie.

This surprised Riku, her statement started to make him question himself if she was really with the Darkness or not. Yen Sid walked up to her with an impressed look on his face, "What a fantastic display of strength, Katie. It looked like you've known how to use a Keyblade all your life."

"Yeah, but I haven't though. I've barely have owned these Keyblades for a day!" Katie said with a grin.

"Maybe we should talk about your events before you came here." Yen Sid suggested as he stepped to the side. Katie nodded and walked back inside the tower with Riku in tow.

"…And that's how I got here." Katie finished.

Yen Sid stroked his bread. "Hm…your story is troubling, my dear."

"Why would Master Xehanort want you as a host?" Lea asked.

Katie shrugged. "I dunno. I overheard one of the Xehanort's say that I had a heart made equally of light and darkness." Katie sighed while shaking her head, "I don't like the sound of that."

"Well, it's a good thing you broke away, Katie!" Said Sora with a grin.

"Wow you listened this time, Sora. I'm impressed." Katie joked. She, Riku, and Kairi laughed at Sora's 'angry' face. "Hey, King Mickey?"

"What is it, Katie?" The King asked.

"I wanna help you guys find Aqua and Ven."

Everyone was taken aback from Katie's request. "You know Aqua and Ven?" King Mickey asked.

"Well…not personally…but I know Terra!" Katie chirped.

"Terra?!" Yen Sid and King Mickey asked in unison.

Katie nodded and unclipped Terra's Wayfinder off of her belt. "This is proof. He gave it to me before Old Fart Xehanort took me away."

"That means Terra's okay!" King Mickey said gleefully. "Where is he now? Do you know?"

Katie scratched the back of her head while answering, "Well…not exactly no, but I have a good hunch where he is: Castle That Never Was. I know where Ven's heart is too."

"You do?!" King Mickey asked gleefully.

For her answer, she pointed at Sora. "It's over there."

Sora pointed at himself. "Me…?"

"Yes, you."

"But that's impossible! He's Sora!" said Riku.

Katie sighed. "Ven's heart is sleeping within Sora's heart." She explained. "It's pretty much the only reason why he can wield a Keyblade. Trust me; I come from a world that knows about all you guys' stories. Heck, I know more about you guys than you know more about yourselves!"

"But, where would Ven's body be?" asked Sora slowly, still shocked that he was carrying the boy's heart.

"Castle Oblivion." Katie answered smoothly.

"What? But I don't remember seeing anyone by the name of 'Ven' at Castle Oblivion." Repliku retorted.

"That's because he's hidden, smart one. I don't know exactly where but I know that he's there somewhere." Katie said while ruffling Repliku's hair.

"This information is a great help to us, Katelynn Heart. With this knowledge, we can defeat Master Xehanort." Yen Sid told Katie, who bowed. He looked at everyone. "We must find Aqua, Ventus, and Terra immediately."

Katie raised her hand up to get his attention. "I suggest we look for Aqua first. She's wandering around in the Realm of Darkness."

"Good idea. But we must find an opening to the Realm." Yen Sid concluded.

"That's easy, travel to different worlds until we find the opening. Sora's found it once, he can find it again." Katie said with a grin.

Yen Sid bowed down his head in agreement, "In that case, I will let you, Riku, Sora, Kairi, and Lea find the door to the Realm."

Lea put Katie in a headlock and gave her a noogie. "Welcome to our group, kid."

"Lea, stop! You're messing up my hair!" Katie laughed; she easily broke away.

Repliku stepped forward. "Where ever Katie goes, I go." He told Yen Sid.

"That is understandable, Repliku. You may go with them as well." Yen Sid said.

Repliku grunted and bowed in respect.

"There's just one small problem…" Sora mumbled.

Katie looked at him, "And that is?"

"There is no way the Gummi Ship can hold all six of us." He answered.

Yen Sid stood up. He handed everyone a heart emblem, "Put these on. They will give you the power to summon armor and use gliders." Everyone did what he said. Katie and Riku put the armor on their arm, Lea and Repliku hooked it to the chain of their coats, Kairi put it on her bag, and Sora on his wrist. With a flash of light, everyone had a piece of armor appear on their shoulders. "To use the glider, point your Keyblades to the sky to summon a portal then through your Keyblade into the air so it can turn into your glider." Yen Sid instructed. Everyone nodded in understanding. "Now go and find the Three Fallen Warriors of Light."

Everyone did a mock salute and yelled in unison, "Yes sir!" They all ran down the stairs, ready to start their new journey.

Katie turned to everyone after they got outside, "Okay guys, you ready?" Everyone nodded. "Alright, then summon your armor like so!" She hit the red orb of her armor piece and got engulfed in light. The light shattered and revealed Katie's armor. Her armor was just like Aqua's put her 'horns' pointed up instead of down and the color scheme was black, copper, and red and had a piece of black ripped up cloth that faded to red coming out of her right shoulder, like Lightning's in Final Fantasy XIII. The group followed her example and got there armor. Riku and Repliku's were the same and looked similar to Terra's but the color scheme was black, silver, and gold. Sora had Ven's armor. Lea's armor was a mix of Ven's and Terra's and its color scheme was black, red, and orange; like a flame. Kairi's was just like Aqua's but its color scheme was gold, pink, and light silver. Katie pointed Darkness' Master at the sky, creating a portal. They all threw their Keyblades into air and jumped onto their air crafts. Katie's resembled a skateboard with a built in bow and arrow. Riku and Repliku's looked like Terra's. Kairi's looked like Aqua's. Sora's looked like Ven's. Lea had a Segway looking thing. "Here we go!" Katie yelled, she took off like a bullet through the portal with everyone close behind. Their journey has officially begun.

Holy crap, my hands HURT! This is a long chapter. Tell me what you think bros! Peace out! ^-^