Muriel the Great Witch had the ultimate power to destroy humanity: a powerful book filled with all the secrets of the devil.
But when the witch hunters Hansel and Gretel murdered her, she left the book behind ready to be found by the correct witch.

Meanwhile, in the other world, Sombra freed from his prison and wanders all over Equestria looking for the power to defeat the four Alicorn Princesses once and forever; it's when he feels the dark energy from Muriel's book. Using all his power he travles to the human world ready to put his hooves on the book.
Unfortunately, with Hansel and Gretel waiting... that wasn't the wisest idea.

SPOILER ALERT: this story contains several information about the movie Hansel and Gretel Witch Hunters. If you haven't seen it yet, you've being warned.