Nightmare King

The Nightmare King is a God NPC who appears only in Nightmares, trapped in the same realm that the Death God resides in.

Description
Along with several other dangerous Gods, the Nightmare King is kept in the same dimension the Death God resides, to keep it's terrible powers from massively influencing Primordial. This is a direct violation of the laws of the Seraphs, who deem it necessary to have all Gods be a part of the world at all times- regardless of what they might do.

Though he is unable to directly affect Primordial, he can appear in the dreams of those he wishes and attempt to influence them to do his bidding. The underbelly of Primordial is believed to be teeming with many who are slaves to the will of the Nightmare King, as once he's got his snares into a willing Primordian, he controls them by limiting the amount of time they can sleep and giving direct orders to make them follow.

Tired slaves will do anything for a chance at rest once more.