The nightmares, or Servants of Fear, are a sub-race of demons from the 669 layer of the abyss. They came through the nightmare portal when it was first opened and used their powers to manipulate the people of Dernyn to build a tower around the portal. Once completed, this tower was to be the stronghold used to mount an attack upon this world and claim it as their own. However, these plans were delayed when the people of Dernyn grew uneasy at the increasing nightmares they were having and placed the blame upon the tower and its occupants. Deeming them a threat the people came together to amass an attack on the tower and its occupants, successfully shutting down the portal and delaying the plans of the Nightmares.
The Nightmares themselves are hideous creatures of legend. Capable of many horrors and atrocities. Once angels, they have fallen out of the grace of their gods and become corrupt to the core. Their once beautiful feathered wing have rotten and the feathers have fallen off, leaving only the barely functional skeletal remains. Their golden eyes, once bright and shining with the power they held within, are now dull and gray with corruption and bitterness. The golden ichor that once flowed through their veins has turned to a black sludge. And their heart, once pure and strong, is now but a void. Their skin rots around them and only the magic that they still hold stops it from completely shedding leaving a horrifying figure in its wake. Their very presence used to bring peace and solitude to those around, but now only causes unease and discomfort and in some instances outright fear. To behold one of these is to behold the living image of a Nightmare, and thus they got their name.
Despite having fallen and become corrupt the Nightmares still carry most of their angelic power with them. Some would even say they are more formidable foes now that they have discarded their sense of righteousness. Magic still runs strongly through their veins and power is still a close friend to the Nightmares. Despite this however they have still yet to figure out a way to re-open the nightmare portal and again allow their brethren access to this realm.