A fearsome and mostly legendary figure of terror and torment. Stands outside of the Fey Courts, but mainly associates with the Unseelie.
A bringer of nightmares, wraiths, ghosts, and terrors that has become infamous for tormenting creatures for their own fell, nefarious, and sometime seemingly capricious motivations.
Some have suggested that the Nightmare King views its actions as some kind of test, or survival of the fittest, improving creatures through their fears. But apparently its motivations cannot truly be known, for those that have tried have died, gone insane from nightmares and dread, or simply disappeared.
excerpt from Van Richten's documents