Mirror, Mirror

"Why does your home have princes? Aren't the rulers supposed to be mares?"

"No, and they've never been mares. The first mare close to ruling I can think of is Princess Chrysalis, but she rules her own kingdom, the Rock Empire." The other Twilight replied.

"How exactly is your world different?"

"I live in Tolretnac as Prince Solaris's assistant in magic. Along with my friends Purple Pie, Common, Orange Jack, Rainbow Shy, and Flutter Race." She grinned.

"Who?" Rainbow Dash questioned her.

"Why don't you come see for yourself? That gateway will be open as long as you desire." She persuaded and smiled brightly. "Come on!" They all shrug and jump in with Moonlight Twinkle.

"Ah, Moonlight Twinkle. You're back at last with some slaves." A tough manly voice said once they went through. They were in some dark palace, and an alicorn colt was in front of them, the prince. But he didn't look even close to friendly compared with Princesses Celestia.

"Yes, great Leader. I tricked some ignorant losers from the Mirror Realm to here. Do with them as you please, and soon you may have more." She bowed to Prince Solaris in evil pride.

"This can't be happening. Why would some pony give me a portal to an evil Equestria? It doesn't make sense." Twilight whispered to her friends.

"SILENCE YOU MULES! I control you all now, and unless you want to be banished to the sun, I suggest you do as I ask, slaves." The prince cackled. "Guards! Take them to the dungeon, and Moonlight, go to this other world and find the pony responsible for opening the worlds, they shall have a reward greater than themselves. Understand?"

"Yes, your greatness." She vanished back into Equestria, leaving the mane 6 trapped in this other world.

Twilight and her friends were brutally escorted into a cage in the dungeon. Chains were locked to their necks and hooves, magic locks were placed on Rarity and Twilight's horns, and RD's, Fluttershy's, and Twilight's wings got covered in chains also to prevent any ideas of escaping using flight. The guards smirked at them, and left. Making way for the prince to enter.

"Well, well, well. Comfy? Ready to be controlled forever?" The mane 6 refused to reply. "I thought so..." His hooves clanked across the dusty jail floor towards them, making soft clapping sounds.

"What's going on here? Do you really expect anypony to be your slave? Moonlight can't possibly serve an evil monster like you." Twilight struggled, but the chains kept her decently still.

"She is an astounding actress isn't she?" He laughed. He put his hoof under her chin, and Twilight had an enraged look on her face. The room was dark, but dim enough to see his face if he was close enough to you.

"What even makes you believe that we'll obey you?"

"I have my ways. I'm the ruler of all of Airtseque. Even if you're an alicorn, you can still fall under my power, little pony." He cackled in her face.

"What ways?" Twilight asked. Solaris scoffed.

"You'll see. In due time..." He smiled evil-y and left the dungeon. The Mane 6 were worried, what spell could Solaris possibly have and use to control every and any pony?