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A Hive Fleet also creates an impenetrable disturbance in the [[Warp]] like a huge blocking shadow which engulfs areas of space and prevents [[Imperium|Imperial]] [[Astropath]]s from sending or receiving telepathic messages ¹, stops spacecraft entering the warp and forces spacecraft already in the warp wildly off-course {{TyranidsPortalCite This}}. Thus trapping and preventing prey worlds from calling for assistance ¹.The ''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 collective consciousness comprehension of an entire human beings. This however can be argued, as Chief Librarian [[TyranidTigurius]] of the [[Ultramarines]] seems to have some form of relationship with the Hive FleetMind, 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}}

As a powerful psychic presence==Synapse=={{main|Synapse}}On the level of the battlefield, anyone with certain large and relatively autonomous Tyranid creatures, such as the [[psyker|psychicHive Tyrant]] ability can feel it. Almost every attempt by a or the [[psykerWarrior]] to make contact with a Hive Mind, even by some of the most powerful, results in insanity or death, either because it would require an incredibly powerful psyker are able to withstand telepathy exert the Hive Mind's awesome psychic presence or because the nature of influence in order to control smaller Tyranid creatures, which without the Hive Mind is completely beyond the comprehension would revert to genetically instinctive behavior of human beingsfeeding and self-preservation. This however can be argued, as Chief Librarian Tigurius of the Ultramarines seems to have some form of relationship with These [[Synapse Creatures]] focus the Hive Mind, as he is able to make remarkable predictions about into nodal points that quell the Tyranids and their movements. This could be due to his uncanny gift natural instincts of making predictions in general, but the accuracy nearby small Tyranid creatures and frequency of his predictions about are essential for the great devourer seem swarm to show he has indeed tapped into the Hive Mindoperate effectively.^{1, a feat thought possible only by a psyker of the Emperor's degree.} ²

The ==Brood Mind=={{main|Brood Mind}}A smaller and more localised version of the Hive Mind, formed from untold billions is created by the interlinking telepathy of individual consciousnesses, a [[Genestealer]] Brood. This ''Brood Mind'' is used to control host victims impregnated with Genestealer genetic material. It also fulfills the Genestealer's role as infiltrators as the Brood Mind acts as a single coordinating will that directs psychic beacon to draw a Hive Fleet towards the entire hive fleetplanet it is centered on. Mankind still searches vainly for Then when the higher beings they suppose control Hive Fleet comes within a few hundred light years of the hive fleetsinfected world, and though such mighty creatures exist they no more control the hive mind than single brain cells control a man's body. It subliminal reaction is triggered in the sum Brood Mind to goad the Genestealers into a frenzy of killing and breeding. Thus collapsing the hive mind society in which motivates it, not its constituent partsthey were hiding and making way for the Tyranid invasion.²

Some Technomagi ==Imperial Theories==The concept of a Hive Mind is so utterly alien and terrifying to a human mind that the [[Adeptus MechanicusImperium]] think that searches vainly for the Hive Mind might just be higher beings they suppose control the psychic network that links the Tyranid race hive fleets, and permits them to access the collective knowledge of though such mighty creatures exist they no more control the location and disposition of all other Tyranid creatureshive mind than single brain cells control a man's body. Others think that it It is in fact an incredibly powerful psychic monster using the Tyranids as puppets, while others think that it might be one sum of the [[Old Ones]]hive mind which motivates it, not its constituent parts.{{Cite This}}

==Shadow in Some Technomagi of the [[Adeptus Mechanicus]] think that the Warp=={{main|Shadow in Hive Mind might just be the Warp}}The hive fleet is so unimaginably vast psychic network that it creates an impenetrable disturbance like a huge blocking shadow. This shadow is links the Tyranid race and permits them to access the dark, impenetrable will collective knowledge of the hive mind itself, before which the astral spirit location and disposition of a puny psyker all other Tyranid creatures. Others think that it is as safe as a candle in a hurricane. The shadow cast by the hive mind presents fact an impenetrable wall which prevents [[astropath]]s from sending or receiving telepathic messages, stops spacecraft entering incredibly powerful psychic monster using the [[warp]] and forces spacecraft already in the warp wildly off-course. As a hive fleet advancesTyranids as puppets, the area while others think that it might be one of the [[ImperiumOld Ones]] swallowed up by it simply stops communicating, giving almost no clues as to what has happened.{{Cite This}}