It was an extra hour between one day and the next that only those with an ability we can Persona could sense. It began ten years ago with an accident cause by the accumulation of too many captive Shadows. They have the ability to disort time and space and too many of them were gathered into one place. There was an explosion, and Tartarus and the Dark Hour were one result. I am afraid I was responsible for another side effect, and for not stopping it in time.