Keys to the Kingdom

"It all starts and it will all end with you, my boy." Xehanort proclaims as he extends his arms out to welcome the child. As he sets the most important piece in place for the game he's been waiting to play for 15 years straight. A game that, as far as he's concerned, he's already won. "My final vessel: Number Thirteen… Sora. You are the one who will open the door." KH3 AU Fic