Here's the idea: Across Equestria, a sinister force is taking hold in many places, one that changes the very ponies it infects. It corrupts their bodies and minds to where they no longer care about themselves, only doing what their mysterious master tells them to do, and that is to spread their corruption throughout Equestria. The black armies of corrupted ponies march across the lands, infecting and corrupting wherever they go, and the two royal sisters are powerless against the onslaught. It will take a group of extremely brave and fierce heroes to face these threat to the once peaceful Equestria. Here's some extra info, I usually include the royal brothers in my rp's, but I am going to say that this before the second civil war that brought them back, so no Elements of the Ancients for this one.
So... essentially zombies? Just a different concept then the normal "lol, we got plague, we got dead, we got live, we got kill stuffs." Sounds interesting.