For the first time, Sora and Discord fought together, not against one another.
Sunset Shimmer's messing with time had warped the room and filled it with both Heartless and deadly traps. Each of their friends and Princess Celestia herself were in a a cage made of pure darkness and spread throughout the room.
The 4 foes laughed as they too left through corridors of darkness, leaving Sora and Discord to their fate.
Sora summoned the blade to his maw, and the Heartless couldn't resist. Several leaped at Sora, but got grabbed and crushed by Discord as they leapt.
After the Heartless in the first area were dispatched, Sora grabbed onto Discord's back, and the two flew over to Applejack's cage, which was the closest from where they were, suspended in midair. As they got closer however, several flying pegasus pony Heartless attacked. Discord got an idea, and snapped his fingers, blasting the foes away in a flaming panic, as Sora used the Keyblade to unlock Applejack's cage. Applejack spotted Pinkie's cage floating in the corner of the room. The path looked straight, but as they advanced, a huge chasm appeared, guarded by several larger flying Heartless. Applejack used her lasso to swing onto a nearby light, and swung across as the Keyblade wielder and Discord dispatched the batch of monsters. Applejack bucked a column, which fell across the chasm to act as a bridge.
They repeated the process of rescuing and fighting until everypony was free, even Princess Celestia, who used her magic to restore the room to it's former condition.
"Well done, my little ponies." she said, addressing Sora and his friends, "and well done Discord. I am glad you have decided to work alongside us."
Discord bowed to the princess, and apologized for the darkness he had brought about, before vowing to help return Equestria to normal.
"Now, my little ponies, Sunset Shimmer's spell has caused a rift in time. She has brought together forces you have fought before, and those you have not truly met yet. That rift is dangerous. If it should remain open for too long, Equestria could fall apart quite literally, and be destroyed. But, fear not. The power of friendship shall save us!"
"Before we go, Princess," Twilight inquired, "could you explain why Sora has an element necklace?"
"Of course, Twilight. It would be my pleasure. Sora is a very special pony. I knew that when I first met him. He has many hearts connected to his own, and when you, who are the physical embodiments of the Elements of Harmony, opened your hearts to his, it created a 7th element: the Element of Light! There are no longer six elements, but seven. Sora represents the light that can never be extenguished fully. The light of true friendship!"
"Amazing...." was all Twilight could say.
One of the royal guards suddenly walked in.
"Your highness, something is happening in Ponyville! It seems that a dark creaure has appeared there.... but I don't understand how it could be there! I thought she was destroyed!"
"Who?" the Princess inquired.
"Nightmare Moon," the guard responded.