The Heartless vanished after being defeated. Riku looked around for Zexion, panting. That was more of a work out than he needed. The slate haired man was no where to be seen. He turned around. What he did see made his jaw drop. "Sora?!" he cried running toward the brunette. Sora was staring out in the darkness that surrounded the tiny bit of Destiny Islands that was still intact. "Sora! Sora...It's me."
Sora suddenly swung around with his Keyblade out. Riku gasped and jumped back just in time to avoid it. Sora ran at Riku. Riku held his Soul Eater out, blocking the Keyblade. "Stop it Sora!" he said struggling with the younger boy. "Don't you recognize me?"
"Yeah. I recognize you," the brunette hissed. "I can see exactly what you've become!" Sora jumped back, making Riku stumble back. He held the Keyblade out, hitting Riku with a beam of blue light. Riku cried out in pain and flew back several feet, landing with an oof on his back. "Look at you," Sora said glaring at Riku, "Shrinking away from the light...You're not Riku anymore. You're just a pawn of darkness..." Riku couldn't believe what he was hearing. Zexion had been right after all. "So be it. It's time for you to face the light!" He pointed the tip of the Keyblade toward the dark sky, summoning an immense amount of light. It surrounded Riku who winced and screamed in pain as the light swallowed him whole.
Zexion laughed to himself, watching Riku floating in the light. That child's darkness wasn't strong enough for the light, he thought. So be it. If the Organization can't have such powerful darkness, no one can. He can stay trapped in the light for all eternity for all I care. Brown spikes fell in his eyes and he blew them away.
Riku opened his eyes slowly. He was whispering something that Zexion couldn't hear. Zexion watched him closely. He seemed to get a look of determination on his face. "Is he talking to himself?" the Schemer couldn't help but ask. Riku suddenly vanished. Zexion's, now, cobalt blue eyes widened. "Wha-"
Riku reappeared, standing in the middle of the light. "Darkness, awaken!" he shouted. Darkness coated the boy leaving him in a different outfit and with stronger power as Zexion could smell. Riku turned to face Zexion and slashed him through the light.
The illusion faltered, the light disappearing. Zexion outstretched his fingers. "Im-Impossible!" The illusion of Sora vanished and he became himself, his slate hair falling back in place over his right ice blue eye. He fell to his knees. Riku turned to face him. Zexion stood slowly, turning around, a hand pressed to his side. "How did you find me in the light?!"
"You reek of darkness," Riku said, his turquoise eyes narrowed. "Even the light can't block out the smell. I followed the darkness right to you."
So he can detect people by their scent too, Zexion thought. He summoned his lexicon, the pages flying around the two. He glared at Riku who ran straight at Zexion. Zexion vanished, reappearing behind the boy, sending the pages at him. The book grew and slammed Riku shut in it but Riku quickly sliced through the papers with his Soul Eater. He ran at Zexion a second time, this time making contact, causing the Schemer to fly backwards. He's stronger than he looks, the slate haired man thought standing. Again he vanished, appearing behind Riku who spun around almost instantly, the Soul Eater cutting into Zexion who fell to his knees, breathing heavily.
"Heh...After all you protests you're still just another darkling," Zexion said looking up at Riku.
"I know who I am," Riku growled, glaring at him.
"Since when?" Zexion wheezed, standing. He staggered for a second but quickly got his footing back. "You were terrified of the dark before-"
"I'm not now!!" Riku practically flew at Zexion who instinctively held his hands up, trying to block his attack. That didn't help any. The Soul Eater cut into him. Zexion froze for a second then cried out in pain and vanished in a portal of darkness.
Riku stared angrily at the spot where the Schemer had vanished. He reverted back to his original form and headed toward the next floor.
A/N I know, I didn't describe the battle scene too well, sorry.