Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

We all seek the truth, even those who were born to die. When six ponies wake up in the last place they expect to be, will they be able to escape and seek the truth for themselves?

Disclaimer:
I do not own ANY of the characters in this story!
My Little Pony: Friendship is Magic is copyright of Hasbro
Fullmetal Alchemist: Brotherhood is copyright of Hiroshi Onogi/ Square Enix