Psykers The extrasensory, seemingly magical abilities of the psychically-gifted individuals known in the Imperium of Man as psykers are powered by the energies of the Warp, and when such power is used, the daemons and creatures of the Immaterium are drawn to the psyker's mind like moths to a flame. Those humans trained in the use of the psychic arts are able to resist such incursion to a degree, but the greatest fear of the Inquisition is the fact that an untrained human psyker of sufficient power can become the target of daemonic possession -- and a gateway for the intrusion of the daemonic servants of the Ruinous Powers into the physical world. Warp Entities The Warp, through a realm of pure psychic energy that is inimicably hostile to all forms of organic life from realspace, is home to its own forms of life, sentient and otherwise. Many of these creatures are not sentient but depend upon the absorption of psychic energies to survive and are thus naturally drawn to the psychic emanations of mortals in realspace whose psyches are the very wellspring of the Empyrean. Such creatures include the Vampire, Psychneuein, Astral Spectre, Astral Hound, and the hideous Enslavers. Enslavers are spontaneously created by the shifting energies of the Warp from the nightmares of sentient species, and prowl the Immaterium like sharks. The Enslavers are able to psychically control other species, forcing them to their will, hence their name. Enslavers are able to control almost any species, even creatures such as Tyranids and daemons! However it is thought that the only race immune to the Enslavers are the Necrons, who have no souls nor psychic presence in the Warp. Enslavers exist primarily in the Warp, but can enter the physical universe like a daemon through the unprotected mind of a human psyker. They are able to do this when three Enslavers band together to form a 'trinity', whereupon they form a psychic bond with their psyker victim. Over the course of the next 2-3 days after contact is made, the psyker's organic chemistry changes significantly, the end result being a living, pulsing Warp Gate, through which the Enslavers travel into the material universe. Enslavers are rather like an octopus in shape, their main body being made up of two roughly circular parts, one on top of the other. They have 8-12 small tentacles protruding from their bottom half, and 2 larger tentacles ending in suckers. On the smaller, upper half of their body, they have a sensory organ sometimes referred to as an 'eye'; this circular organ is normally reddish in colour. Their leathery skin is able to change colour, but is normally a light brown with pale tentacles. But far worse than these creatures are the truly intelligent denizens of the Warp, the Daemons of Chaos. Starships that travel through the Immaterium by use of a Warp-Drive are shielded from attacks by these creatures by their generation of a Gellar Field. Should this field's emitters fail or malfunction, the crew of the ship will be at the mercy of all of these horrors, and will likely be consumed by daemons or become their mortal playthings. The Warp is also the home of the greatest of all terrors, the four major Chaos Gods -- Khorne, Nurgle, Tzeentch and Slaanesh -- who each dwell within a separate kingdom within the Realm of Chaos, the existential embodiments of the darkest aspects of countless sentient species' psyches. Though the Immaterium and the Ruinous Powers are essentially composed of the same kind of psychic energy and the terms "Warp" and "Chaos" are often used interchangeably by those who are aware of the nature of the Immaterium within the Imperium of Man, each Chaos God maintains a primary form that embodies their nature and that is instantly recognisable to their legions of daemonic and mortal followers.

Daemons The Chaos Gods are not alone in Warpspace. They have created servants from their own essences -- the creatures that mortals have named daemons based on their ancient legends and religious mythologies -- who are not so closely bound to the Warp. Daemons are entities of a somewhat different nature to their masters, and are the most numerous of the creatures to be found in the Empyrean. A daemon is "born" when a Chaos God expends a portion of its own power to create a separate being. This psychic power binds a collection of senses, thoughts and purposes together, creating a personality and consciousness that can move within the Warp. The Chaos God can reclaim the independence it has given to its daemon children at any time, thus ensuring their loyalty. It is only though the loss of this power that a daemon can truly be destroyed, its mind dissolving into the whirls and currents of Warpspace. Daemons have no physical presence within the Warp. The Realm of Chaos is anathema to the laws of physics and the starships that navigate its depths do so by taking a skin or bubble of "reality" with them when they enter using their Warp-Drive. Instead of possessing a true physical form, daemons project a form conjured from raw psychic energy that is essentially a lesser interpretation of their master's fundamental nature. Hence, the bizarre and inhuman appearances projected by daemons indicate their presence, status and allegiance to a Chaos God. Though it may appear to be made of normal matter when it materialises in realspace, a daemon's form is no more physical than it is in the Realm of Chaos. In fact, they are beings of pure Warp energy given shape and depth. When manifested in the material universe, daemons have particular invulnerabilities and weaknesses, as well as many strange powers derived from their Warp-born nature as psychic beings. Slaying a daemon's physical projection does not kill it, but only severs its presence in reality; its true essence in the Warp remains unharmed. When a daemon is "killed" in the material universe, it is banished back to the Warp. If not simply re-absorbed by its creator, it must remain there to regain its strength that it eventually might manifest itself again. Legend has it that a daemon banished in this way cannot return for a thousand Terran years and a day,, though it is of course impossible to prove such a belief through study, and the concept of time itself is meaningless within the Warp. The slight to a "slain" daemon's pride is considerable, however, and the daemon is forced to endure the mockery of its fellows until it can return to corporeal form and avenge itself. The most powerful daemons will call upon any servants and tributary Lesser Daemons to help them achieve their revenge. If it has many allies, it may also request their aid, though all daemons are cautious in doing so. Such favours must inevitably be returned, and no daemon welcomes the dominion of another creature, be it mortal or daemonic