Magic is Inhumane

The Humane Seven wake up to discover that all Equestrian magic in their dimension is all gone, as this leaves the plain at the risk of collapse due to this loss. The Humane Seven can't pony up, and EG Spike can no longer talk. They discover via the Mane Seven and the Lodgers that a pony named Pristine Wind had stolen it because of the magic there being used irresponsibly and deems Equestrian magic dangerous there. But since this act threatens to destroy Human Equestria, the heroes must stop her before it happens.