You should never mess with space-time magic without complete mastery over it. Spike and Luna learned that the hard way.

Equestria opened its borders, but when the Everfree went crazy, the princesses were forced to call for help. Hybrios sent sixteen of their best to protect Ponyville and fight against the forest. I'm Fairy, and I'm one of them.

Fairy and Spike reside peacefully in the region of Equus, helping their friends with their respective works. However, Professor Moon Dancer gives them the chance of going on an adventure, and they readily accept her offering.