When six friends are exploring, Twilight accidentally casts a spell that misfired and threw them all into another world. Her, Pinkie Pie, Rarity, Fluttershy, and Applejack all end up in a city they couldn't recognize. It couldn't be in Equestria, because they changed form into something. Something Twilight did recognize, in some ways.

When Griffonstone had ponies coming from far and wide to visit, it still had the Idol of Boreas, the god of wind's blessing. But when Arimaspi tried to steal it... he didn't get to keep it, but the griffons lost it, and they thought there wasn't going to be any more trouble. But there's one thing they didn't know...

Introduction
Daring Do panted and panted, barely lifting her hooves as she walked down the path. But her legs were always ready for an adventure, and they should be, for what they're doing today.

Because Daring do was going on a quest that no one else has ever finished and returned.
Getting weaker ever step, she finally made it to her destination.

Daring Do
and the Mirror’s Curse
Introduction

Daring Do peered through the shattered window. She saw a galloping, mysterious mare. Her lavender eyes glowing, she was staring at a map, pointing at Ponyville. She must want to go there!

She snickered. “Greatest Equine who ever lived!” she said.

She decided to follow her. She just looked suspicious.

Then the unicorn started cackling. “HAHAHAHAH!!!
No one can beat me! And they won’t even try... if they believe me! It’s not like anyone can really vanquish an Ursa Major. But I’ll just say I can to make me look better!”

Daring Do squinted. She knew that pony from somewhere, but where?