This was the massacre of Equestria, though many would not believe so. From within one book came forth a plague; a plague that seeks to wipe clean the land with fire and blood. For countless centuries, the ponies of the land stood strong, opposing all of their foes. There was no enemy that steel could never conquer, no beast that magic could never tame. This was what they've been taught. No words were spoken of the ancient horde now rising from below, and only few could tell the tale. The rage of the rat was unleashed. It was time for Equestria to face the Vermintide.