The Spirit Stones. Thirteen stones which contain great and powerful spirits, bound by Star Swirl the Bearded himself, entrusted to the Princesses. But when Nightmare Moon was banished to the moon, they were lost, quickly relegated to legend, then myth, before fading from history altogether.

But when Twilight releases them by accident, they spread across Equestria, chaos following in their wake as they seek new masters.

Can Twilight and her friends stop the spirits in time, before Equestria is destroyed?

And what is their link to Gaia, the lost Alicorn of the earth?

Prepare to expect the unexpected.