Element 115, the secrets that hold it are a complete mystery to all except one group.
Group 935
They tried to create a new super-soldier with this element.
The experiments went wrong however, and all hell broke loose.
Meanwhile, eight mares are preparing for an important day, but this event may in fact spell their doom. Join the Mane Six, the two princesses, and four zombie warriors as they try to ascend from darkness, and find salvation.

Or, so they think...