They say that in defeat, you can only get stronger. That quote remains true for the most recent residents of the hellish prison in the deepest part of Tartarus known as "The Nether". The Nether is usually reserved for the worst of criminals, but these ones actually haven't had their spirits broken yet. Those spirits are the Nightmare Force; Kuja and former ruler of the Crystal Empire, and one of the most cruel ponies known to anyone; King Sombra. That combination is an incident waiting to happen, and unfortunately for Hades, that incident is coming faster than a bolt of lightning.