Twilight agreed to help Tails make a portal between Mobius and Equestria. Dash was still concerned about not being able to see Sonic one they go through the portal. Everything that Sonic did for Equestria made her realize one thing. The longer he stayed the harder it'd be for her to let him go. So she started avoiding contact with Sonic a week after they found Spike and Rarity. She started talking to Yacker and his friends more. Then came the time that she needed Sonic the most.
She woke up in the Ancient Castle of the Princesses of Equestria, where all the Spirits learned about their powers. In fact she was in the room where they released Luna from Nightmare Moon's jealous rage. She felt a bump on her head and remembered that something heavy knocked her out. She looked around the room and found Sonic. A second look confirmed that it was not Sonic… it was the Madness.
"You're finally awake!" he said. "I haven't felt this impatient since I was sealed away into Sanctor the Hedgehog!"
"Who are you!?" Rainbow asked.
"I am the god of Madness. I would explain further, but I'd be telling you too much, and you'd be useless to me as bait."
"Bait!?"
"I can't tell you anything else, business beckons." He flew out the window. Dash was trying to understand what the Madness meant by "bait," when she heard a familiar voice.
"He's going to use you to lure Sonic in," he said. "And he's going to use me to end him." Rainbow looked at the voice, and she found Discord. Tied up in chains and bound to the wall, bleeding black like his blood supply was limitless.
"What happened to you!?"
"Hysteria is a formidable opponent. I was cocky, Rainbow Dash. I shouldn't have let my pride as the god of Chaos let me forget that chaos is formed by Madness. Pain leads to anger, anger leads to hate, hate leads to suffering, suffering leads to madness, madness leads to chaos, and chaos leads to pain. It's a never ending cycle of negativity only if you let it be that way."
"I never thought that fighting fire with fire would work for chaos."
"Normally it doesn't."
SonicSonic knew that whatever kidnapped Rainbow was after his head. But there are some traps that need to be set off for the sake of freedom, as Tikal would often say. So he set up a counter-trap. He brought Silver along, and Fluttershy for some reason decided to go along, which was very unlike her. Finally they found the ruins of a castle.
"This is where it happened…" Fluttershy exhaled.
"Where what happened?" Silver asked.
"Where my friends and I realized that we were the Elements of Harmony. This is where Luna was set free of Nightmare Moon."
"Appropriate, isn't it?" a voice said above the last tower. "That the darkness in Equestria was destroyed in the very place I plan to destroy the light?" Sonic looked at the figure above the tower. It was almost like looking in a mirror, but the eyes were red as dying rose petals, his fur was completely black, and his wings… they were the wings of a fallen angel.
"Hysteria…" Sonic said in astonishment. "But Chaos destroyed you!"
"He only released me from my seal. He wasn't very thorough about getting rid of me."
"It was you that kidnapped Rainbow Dash!"
"Of course it was, she was the bait, now it's time to meet the hold!" Hysteria waved his hand and Discord appeared behind him. He was beaten, chained and bleeding what looked like oil.
"Sonic… Run!" Discord warned. Hysteria merged with Discord. And they took on a completely different form. A black figure shrouded in darkness. It wasn't the grim reaper, it was something else entirely. But to Sonic it felt like he was staring death in the face. Seven lights were absorbed by this thing, each with a different color and each with a different shape. Whisps. This made the Monster so terrifying that the shivers still run down the author's spine.
Rainbow DashIt was horrifying what Dash was looking at. So horrifying that she couldn't believe what happened next. Fluttershy became scared, but less than the normal scared. Suddenly her eyes changed from sky blue, to rose red. Her hair went wild and turned gold. The Element of Kindness appeared around her neck, and became more elaborate. The butterfly jewel went from pink to white.
"I am the Harmony Goddess of Kindness!" She said. She reached down and touched Sonic's shoulder, whispering in his ear. Sonic looked less terrified now. He summoned Whisps one for each power.
Then things became more… musical. There was an amazing song playing from the heavens. And every move Sonic made was in time with the music. Then the monster's head was separated from the body. She heard a voice yell "Unlimited Colors! Spike! Rocket! Drill! Hover! Laser! Cube! Frenzy!" as each power was called the respective Whisp got into a circle, through which Sonic jumped and became a bolt of White Light. He shot straight through the monster and it reverted back to Discord… or at least the statue of him, the way he was left at the garden in Canterlot before Sonic and the others showed up.
Maybe this is better for all of us. She heard Discord in her head. Sonic looked exhausted, and collapsed.