In the sewers of Canterlot, after one pony tried to carry away the corpse of a friend, a new and extremely dangerous mutant appeared. Rebecca, an ordinary pony, in a hazmat suit. Her skull is gnawed and she has no eyes. Only empty eye sockets. Her ears are adapted to any noise, because in the darkness of the sewer, you don't need eyes, any sound. Her torn suit, stuck to the skin, showing bones, and remnants of meat and flesh. When Rebecca is near, pony hear whistle around them.