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From Warhammer 40k - Lexicanum
→Shadow in the Warp
===Shadow in the Warp===
{{main|Shadow in the Warp}}
The psychic presence of the Hive Mind is so powerful that it radiates out of Tyranids like a flood. This permeating psychic power on the gigantic scale of a [[Hive Fleet]] distorts the [[Warp]] for light years around the fleet's position, preventing [[Imperial]] [[Astropath]]s from sending or receiving telepathic messages, stopping spacecraft entering the Warp {{Cite This}} and forcing spacecraft already in the Warp wildly off-course as Warp travel becomes increasingly unpredictable. This invasive "Shadow in the Warp" sows terror and confusion on prey worlds as it traps and prevents the doomed inhabitants from calling for assistance. It even penetrates into the minds of nearby creatures and manifests as a primal malaise that can never be expelled. If a creature has psychic potential, the horror they feel is magnified tenfold and using their psychic abilities could drive them into incurable insanity. As a Hive Fleet approaches a target planet, whole populations will plunge into madness and despair even before the first Tyranids have made planetfall.{{Fn|1}}{{Fn|3}}
Almost every attempt by a [[psyker]] to make contact with the Hive Mind results in insanity or death, either because it would require an incredibly powerful psyker to withstand the Hive Mind's awesome psychic presence or because the nature of the Hive Mind is completely beyond the comprehension of human beings. This however can be argued, as [[Chief Librarian]] [[Tigurius]] of the [[Ultramarines]] seems to have some form of relationship with the Hive Mind, as he is able to make remarkable predictions about the Tyranids and their movements. This could be due to his uncanny gift of making predictions in general, but the accuracy and frequency of his predictions about the great devourer seem to show he has indeed tapped into the Hive Mind, a feat thought possible only by a psyker of the [[Emperor]]'s degree.{{Cite This}}
