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From Warhammer 40k - Lexicanum
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When a [[Psyker]] uses one of their [[Psychic Powers|powers]], they invariably draw from the essense of the [[Warp]], to manifest fantastic abilities that would be otherwise impossible to perform.
However, by drawing '''warp energy''' into the '''material realm''' there are often unexpected consequences beyond that of the [[psychic power]] itself. Most commonly manifesting itself in a layer of frost covering the '''Psyker''' himself<sup>{{Fn|2</sup> }} or nearby surfaces.<sup>{{Fn|1</sup> }}
Other forms of '''Psychic Phenomena''' certainly do occur, and become more prevalent with the scale of the psychic power being attempted to manifest.<sup>{{Fn|1</sup>}}
Such an event is incredibly difficult to predict or suppress, and will easily give away the position of the psyker in question, even if they are attempting to use their powers discretely. The best way to lower the risk of '''psychic phenomena''' is either to use powers that require less energy, or do not draw from the '''warp''' at all.
Within the superstitious [[Imperium]] such psychic phenomena can be used to easily identify '''Psykers'''<sup>{{Fn|1</sup>}}. However, it is not entirely known how other races respond to the strange occurences that accompany psychic powers.
==Known Psychic Phenomena==
The potential '''psychic phenomena''' have been been identified and catalogued by [[Imperial]] [[Inquisitors]].<sup>{{Fn|1</sup>}}
*'''Dark Foreboding''' - A faint breeze surrounds the area, giving nearby individuals an unsettling feeling.
The most dangerous '''psychic phenomena''' are referred to as the '''Perils of the Warp''' and are the most undesirable effects of using psychic abilities. It is for this reason that Psykers are considered to be a considerable threat to the [[Imperium]], as the effects can be potentially catastrophic; allowing daemonic forces to enter the materium, or manifesting abilities beyond the control of the psyker. Therefore it is of the utmost importance that psykers be properly trained in the responsible use of their abilities and why such resources are used to capture '''unsanctioned''' and '''nascent''' psykers.
While the '''perils of the warp''' are as wild and unpredictable as any other psychic phenomena, some races such as the [[Eldar]] have managed to mitigate their effects using technological devices, (such as a [[Ghosthelm]]). However, the [[Imperium]] has yet to master their understanding of these technologies, and so the common policy with dealing with [[Psykers]] who suffer the '''Perils of the Warp''' is to provide the Emperor's mercy (execution) to them as soon as their powers become out of hand; referred to as '''the Ultimate Sanction'''<sup>{{Fn|3</sup>}}
Even if a psyker survives an attack from the warp, their souls are permanently marked by the close contact with the warp, becoming more susceptible to the forces of the warp in future.
The different phenomena of the '''Perils of the Warp''' have also been identified and catalogued by the [[Inquisition]]:<sup>{{Fn|1</sup>}}
*'''The Gibbering''' - Uncontrolled warp energy surges through the psykers mind, burning out their minds and driving them insane.
==Sources==
* <sup>{{Endn|1</sup>}}: [[Dark Heresy Rulebook]] - Fantasy Flight Games, {{Cite This}}* <sup>{{Endn|2</sup>}}: [[Fallen Angels (Novel)]] - by [[Mike Lee]], {{Cite This}}* <sup>{{Endn|3</sup>}}: [[Codex: Imperial Guard (5th Edition)]], {{Cite This}}
[[Category:Psychic Powers]]
