Twilight Sparkle, the Princess of Friendship, finds herself transported to another world straight out of old stories she used to read.

Equellas. A place where earth ponies, pegasi and unicorns still live in three separate kingdoms, and the looming threat of war hangs constantly over everypony's heads.

She enlists the help of a hero from her childhood stories in order to find her way home, and discovers that fate has it's own plans for her as a conspiracy threatens to not only destroy this world, but perhaps even Equestria as well...