*I don't any of the Kingdom Hearts characters, I only own Katie.
Master Yen Sid watched the Keyblade Wielders come into his study. He raised an eyebrow at Naminé, Roxas, Vanitas, and the girl with short black hair, not recognizing them. His eyes darted to Riku and Katie, still in his arms unconscious. Riku went over to the wall to set Katie against it. "What happened?" Yen Sid asked.
"We honestly don't know exactly..." Sora admitted sheepishly.
Master Yen Sid motioned his hand at the former Nobodies, the girl, and Vanitas. "I have never seen you four before...who are you?"
"I'm Roxas, this is Naminé."
"We're Sora and Kairi's Nobodies." Naminé explained.
Yen Sid raised an eyebrow at Roxas and Naminé, only have heard their names in King Mickey's tales. His sharp gaze went to the girl and Vanitas. "And you are?"
The girl shifted uncomfortably and didn't answer. Vanitas sighed and answered, "She doesn't know her name. I'm Vanitas."
"Vanitas?" Yen Sid repeated. "You were the darkness within Katelynn Heart."
The retired Keyblade Master's attention went to Repliku when he asked, "Do have any idea how they came to be? They were all originally in someone's' heart."
"They all appeared when the χ-blade shattered." Lea said.
"The χ-blade?" Master Yen Sid repeated, the Keyblade Wielders nodded and pointed at the comatose Katie, saying that she was the one who wielded it. Master Yen Sid made a puzzled hum and stroked his beard as he went deep in thought. "...According to the legend, the χ-blade is made of seven Lights, thirteen Darkness's...it may be possible that the Light and Darkness was returned after the χ-blade's use. When the χ-blade shattered, Sora, Kairi, and Katie's Lights must have given their heart's inhabitants a path out of their hearts and made their bodies materialize back into existence."
It was Vanitas that said, "I was in existence at the same time as Katie...it was when we struck Master Xehanort and Time-Boy down. A few seconds later, I woke up by Katie's side."
"Hm...that supports the theory...however, we may never know how exactly you four came into existence." His gaze went over to Katie and Riku. "What is Katelynn Heart's condition?"
Riku shook his head. "She's unconscious...and her hair still has silver patches...as if Xehanort is still there." He got up to his feet and requested, "Master Yen Sid, I ask your permission to go in Katie's heart to wake her up."
Master Yen Sid thought for a moment then said, "You said yourself that Xehanort may still have a hold of Katelynn Heart, Master Riku...but you must try. There is still hope for Katelynn Heart's full return."
"Thank you." Riku bowed to Master Yen Sid, showing his thanks. He turned to Katie and wielded his Keyblade. Riku examined Katie's face before he raised his Keyblade and aligned its tip to her heart. Just like that, a black sphere-shaped crystal that had dark purple smoke swirl inside appeared in front of Katie. Light engulfed Riku and when into Katie's chest, leaving Riku behind. He dropped his Keyblade and slumped forward. Sora rushed forward and caught his friend.
"Take them to the spare room next door and give them some space." Master Yen Sid ordered. Sora nodded and dragged Riku to the spare room. Repliku went over to Katie and picked her up and went into the spare room after Sora. Repliku set Katie on the bed and Sora layed Riku near Katie. They both left the room and shut the heavy oak door behind them.