My Little Pony: An Unexpected Return

"Are you sure Cadence wants the rubies?" a rugged-looking pony asked his boss.

"Most definitely, but grab amethysts just in case," Emerald Jackpot said, looking around in the cavern, dug up so long ago. " We don't want to upset her."

"You got it, Emerald," the worker said, trotting away.

"Emerald watched as he walked away, then turned back to the cave. She was worked for the Crystal Princess for many years now, and enjoyed every minute of it. Every day, Emerald and her crew went to the Crystal Cavern to collect precious gems to supply every order received from across Equestria. Their biggest orders were from cadence herself and a pony from Ponyville. I wonder who it is, Emerald thought.

Suddenly, a filly came running into the tunnel; frantically. "Emerald!" she cried.

Emerald turned towards her, surprised. "Sapphire? What's wrong?"

Emerald's sister, Sapphire Sunlight, came up to her, breathing choppily. "Emerald - Hurry - The Heart - Black roots - "

"Calm down, Sapphire. What exactly-"

"THERE'S BLACK MAGIC AT THE CRYSTAL HEART!!!"

Emerald froze in shock. Could it be...?

As they began to run towards the Crystal Empire's source of energy, all of a sudden the cavern began to shake. Emerald watched in horror as all of the crystals' colors began to fade - and all the colors rose through the ceiling.

Directly below the Heart.

" NO!" The crystal unicorn cried. She pulled the emergency lever near the exit. "Everypony out of here, NOW! We have to protect the Heart!"

Soon, all the ponies in the cavern came to the exit, but when they reached the stairs, they gasped and backed away.

Before them stood an old enemy, a grey unicorn with a black mane, a red-tipped horn, and furious red eyes. With an evil laugh, he lowered his head as his horn began to glow.

As his eyes began to emit purple gas, he laughed and said, 'So long, little ones.'

His horn gave a flash of indigo light, and then the cavern crumbled to the ground.