Nemesises

Nemesises, also known as dream trackers, are tall humanoid creatures with long limbs and a very long, extendable neck (similar to a japanese rokurokubi). Their features are human though, albeit slighty elongated, and they are generally very beautiful with deep, fascinating eyes. They form a rare species and on Felarya, they all appear to be females. They are intelligent beings with exquisite and refined manners, and when in public, they wear beautiful ornate dress and complicated jewelry. They don't really mix with humans though, and when they do it's often only to offer their services as assassins. In general people tend to avoid nemesises as much as they can because of their frightening reputation. Nemesises are definitely not the sort of creatures you want to mess with. They are extremely agile, able to climb seemingly slick walls, and make excellent archers, but the great fear they inspire comes their unique ability: dream tracking. With just one quick glance, a nemesis can "mark" you.

Once marked, every time you go to sleep the nemesis knows exactly where you are. You will have relentless and terrible nightmares of the nemesis devouring you. The closer the nemesis is to your location, the more vivid these nightmares become. Once she is close enough, about to 30 to 50 meters, the nemesis can "dream-eat" you. The process is an absolute mystery, but what is known for sure is that the sleeping body of the marked person disappears from their bed, and ends up shrunken in the nemesis's belly. It's theoretically possible to fight against the nemesis in the dream, but that would require a mastery over dreams that very few beings possess. And the closer she is, the more difficult it becomes. For the marked person, waking up from the nightmare when the nemesis is about to dream-eat them would be extremely difficult as well, unless the nemesis allow them to do so. What is especially terrifying is that there are no known limits on how many targets can be marked this way. A nemesis could spy on a small army, mark all of them, and eat them one by one over the course of the following nights. A Nemesis cannot dream-eat several targets in the same time, though, and they must focus on one, although they can provide nightmares for several at once. There has been interesting cases of nemesises marking friends, in order to keep track of them and delivering them messages or warnings through dreams. They appear to be able to remove the mark they put on a person at will. Lastly, a Nemesis cannot use the mark put by another Nemesis. She must have marked the target herself.

Despite this terrifying power, a Nemesis attempting to dream-eat a person would be in a vulnerable position while doing it, as it is not an instant process. It would take several minutes during which the Nemesis simply can't move. If she is found by security guards or a predator in the meantime, she's in trouble. Nemesises are also vulnerable to Dreamcatchers, magical items able to filter, or catch bad dreams. Depending on their power, they can make excellent shields or even weapons against Nemesises.