Something is happening in the hallowed streets of Canterlot. A madpony hunts for those he believes responsible for his disgrace, urged on by a mysterious force that gives him terrifying power. Captain Shining Armor of the Royal Guard is in a race against time to apprehend this felon before blood is spilled and lives are lost. And in order to do so, he must turn to an ally that may be more threatening than than the very pony he is pursuing. A story from the Lunaverse, it follows the consequences of Greengrass's Night.