Fourth Night

the Fourth Night was the historical Night period which marked the end of the Fourth Day and preceded the Fifth Day. of all four Nights, it was the shortest one, lasting only fifteen years. it was unleashed upon the world by Shade nightcasters located in a nest in the Underworld. it came to an end when the forces of humanity, hundred-thousand-strong, assaulted on the Underworld and killed the Shade nightcasters.